Merge branch 'master' into 'master'

Master

See merge request eddiehung/nextpnr!6

23 files changed, 1477 insertions, 689 deletions

diff --git a/common/nextpnr.h b/common/nextpnr.h
index bc64adb5..40fd3d13 100644
--- a/common/nextpnr.h
+++ b/common/nextpnr.h
@@ -27,6 +27,8 @@
 #include <unordered_set>
 #include <vector>
 
+#include <boost/functional/hash.hpp>
+
 #ifndef NEXTPNR_H
 #define NEXTPNR_H
 
@@ -158,8 +160,30 @@ struct GraphicElement
     std::string text;
 };
 
+struct Loc
+{
+    int x = -1, y = -1, z = -1;
+
+    bool operator==(const Loc &other) const { return (x == other.x) && (y == other.y) && (z == other.z); }
+    bool operator!=(const Loc &other) const { return (x != other.x) || (y != other.y) || (z == other.z); }
+};
+
 NEXTPNR_NAMESPACE_END
 
+namespace std {
+template <> struct hash<NEXTPNR_NAMESPACE_PREFIX Loc>
+{
+    std::size_t operator()(const NEXTPNR_NAMESPACE_PREFIX Loc &obj) const noexcept
+    {
+        std::size_t seed = 0;
+        boost::hash_combine(seed, hash<int>()(obj.x));
+        boost::hash_combine(seed, hash<int>()(obj.y));
+        boost::hash_combine(seed, hash<int>()(obj.z));
+        return seed;
+    }
+};
+} // namespace std
+
 #include "archdefs.h"
 
 NEXTPNR_NAMESPACE_BEGIN
diff --git a/common/place_common.cc b/common/place_common.cc
index b2f0e849..370eff23 100644
--- a/common/place_common.cc
+++ b/common/place_common.cc
@@ -130,10 +130,11 @@ bool place_single_cell(Context *ctx, CellInfo *cell, bool require_legality)
                     if (iters >= 4)
                         wirelen += ctx->rng(25);
                     if (wirelen <= best_ripup_wirelen) {
-                        ripup_target = ctx->cells.at(ctx->getBoundBelCell(bel)).get();
-                        if (ripup_target->belStrength < STRENGTH_STRONG) {
+                        CellInfo *curr_cell = ctx->cells.at(ctx->getBoundBelCell(bel)).get();
+                        if (curr_cell->belStrength < STRENGTH_STRONG) {
                             best_ripup_wirelen = wirelen;
                             ripup_bel = bel;
+                            ripup_target = curr_cell;
                         }
                     }
                 }
diff --git a/common/router1.cc b/common/router1.cc
index 94c7070e..1ea50448 100644
--- a/common/router1.cc
+++ b/common/router1.cc
@@ -75,6 +75,9 @@ struct RipupScoreboard
 
 void ripup_net(Context *ctx, IdString net_name)
 {
+    if (ctx->debug)
+        log("Ripping up all routing for net %s.\n", net_name.c_str(ctx));
+
     auto net_info = ctx->nets.at(net_name).get();
     std::vector<PipId> pips;
     std::vector<WireId> wires;
@@ -143,11 +146,13 @@ struct Router
                 thisVisitCntLimit = (thisVisitCnt * 3) / 2;
 
             for (auto pip : ctx->getPipsDownhill(qw.wire)) {
-                delay_t next_delay = qw.delay + ctx->getPipDelay(pip).avgDelay();
+                delay_t next_delay = qw.delay + ctx->getPipDelay(pip).maxDelay();
                 WireId next_wire = ctx->getPipDstWire(pip);
                 bool foundRipupNet = false;
                 thisVisitCnt++;
 
+                next_delay += ctx->getWireDelay(next_wire).maxDelay();
+
                 if (!ctx->checkWireAvail(next_wire)) {
                     if (!ripup)
                         continue;
@@ -226,7 +231,7 @@ struct Router
             : ctx(ctx), scores(scores), ripup(ripup), ripup_penalty(ripup_penalty)
     {
         std::unordered_map<WireId, delay_t> src_wires;
-        src_wires[src_wire] = 0;
+        src_wires[src_wire] = ctx->getWireDelay(src_wire).maxDelay();
         route(src_wires, dst_wire);
         routedOkay = visited.count(dst_wire);
 
@@ -246,7 +251,7 @@ struct Router
         }
     }
 
-    Router(Context *ctx, RipupScoreboard &scores, IdString net_name, bool ripup = false, delay_t ripup_penalty = 0)
+    Router(Context *ctx, RipupScoreboard &scores, IdString net_name, int user_idx = -1, bool reroute = false, bool ripup = false, delay_t ripup_penalty = 0)
             : ctx(ctx), scores(scores), net_name(net_name), ripup(ripup), ripup_penalty(ripup_penalty)
     {
         auto net_info = ctx->nets.at(net_name).get();
@@ -284,13 +289,93 @@ struct Router
             log("    Source wire: %s\n", ctx->getWireName(src_wire).c_str(ctx));
 
         std::unordered_map<WireId, delay_t> src_wires;
-        src_wires[src_wire] = 0;
+        std::vector<PortRef> users_array;
+
+        if (user_idx < 0) {
+            // route all users
+            users_array = net_info->users;
+            ctx->shuffle(users_array);
+        } else {
+            // route only the selected user
+            users_array.push_back(net_info->users[user_idx]);
+        }
+
+        if (reroute) {
+            // complete ripup
+            ripup_net(ctx, net_name);
+            ctx->bindWire(src_wire, net_name, STRENGTH_WEAK);
+            src_wires[src_wire] = ctx->getWireDelay(src_wire).maxDelay();
+        } else {
+            // re-use existing routes as much as possible
+            if (net_info->wires.count(src_wire) == 0)
+                ctx->bindWire(src_wire, net_name, STRENGTH_WEAK);
+            src_wires[src_wire] = ctx->getWireDelay(src_wire).maxDelay();
 
-        ripup_net(ctx, net_name);
-        ctx->bindWire(src_wire, net_name, STRENGTH_WEAK);
+            for (auto &user_it : net_info->users) {
+                auto dst_bel = user_it.cell->bel;
 
-        std::vector<PortRef> users_array = net_info->users;
-        ctx->shuffle(users_array);
+                if (dst_bel == BelId())
+                    log_error("Destination cell %s (%s) is not mapped to a bel.\n", user_it.cell->name.c_str(ctx),
+                              user_it.cell->type.c_str(ctx));
+
+                if (ctx->debug)
+                    log("    Destination bel: %s\n", ctx->getBelName(dst_bel).c_str(ctx));
+
+                IdString user_port = user_it.port;
+
+                auto user_port_it = user_it.cell->pins.find(user_port);
+
+                if (user_port_it != user_it.cell->pins.end())
+                    user_port = user_port_it->second;
+
+                auto dst_wire = ctx->getWireBelPin(dst_bel, ctx->portPinFromId(user_port));
+
+                if (dst_wire == WireId())
+                    log_error("No wire found for port %s (pin %s) on destination "
+                              "cell %s (bel %s).\n",
+                              user_it.port.c_str(ctx), user_port.c_str(ctx), user_it.cell->name.c_str(ctx),
+                              ctx->getBelName(dst_bel).c_str(ctx));
+
+                std::function<delay_t(WireId)> register_existing_path = [ctx, net_info, &src_wires, &register_existing_path](WireId wire) -> delay_t {
+                    auto it = src_wires.find(wire);
+                    if (it != src_wires.end())
+                        return it->second;
+
+                    PipId pip = net_info->wires.at(wire).pip;
+                    delay_t delay = register_existing_path(ctx->getPipSrcWire(pip));
+                    delay += ctx->getPipDelay(pip).maxDelay();
+                    delay += ctx->getWireDelay(wire).maxDelay();
+                    delay -= 2*ctx->getDelayEpsilon();
+                    src_wires[wire] = delay;
+
+                    return delay;
+                };
+
+                WireId cursor = dst_wire;
+                while (src_wires.count(cursor) == 0) {
+                    auto it = net_info->wires.find(cursor);
+                    if (it == net_info->wires.end())
+                        goto check_next_user_for_existing_path;
+                    NPNR_ASSERT(it->second.pip != PipId());
+                    cursor = ctx->getPipSrcWire(it->second.pip);
+                }
+
+                register_existing_path(dst_wire);
+        check_next_user_for_existing_path:;
+            }
+
+            std::vector<WireId> ripup_wires;
+            for (auto &it : net_info->wires)
+                if (src_wires.count(it.first) == 0)
+                    ripup_wires.push_back(it.first);
+
+            for (auto &it : ripup_wires) {
+                if (ctx->debug)
+                    log("  Unbind dangling wire for net %s: %s\n",
+                        net_name.c_str(ctx), ctx->getWireName(it).c_str(ctx));
+                ctx->unbindWire(it);
+            }
+        }
 
         for (auto &user_it : users_array) {
             if (ctx->debug)
@@ -398,93 +483,235 @@ struct Router
     }
 };
 
-} // namespace
+struct RouteJob
+{
+    IdString net;
+    int user_idx = -1;
+    delay_t slack = 0;
+    int randtag = 0;
 
-NEXTPNR_NAMESPACE_BEGIN
+    struct Greater
+    {
+        bool operator()(const RouteJob &lhs, const RouteJob &rhs) const noexcept
+        {
+            return lhs.slack == rhs.slack ? lhs.randtag > rhs.randtag : lhs.slack > rhs.slack;
+        }
+    };
+};
 
-bool router1(Context *ctx)
+void addFullNetRouteJob(Context *ctx, IdString net_name,
+                     std::unordered_map<IdString, std::vector<bool>> &cache,
+                     std::priority_queue<RouteJob, std::vector<RouteJob>, RouteJob::Greater> &queue)
 {
-    try {
-        int totalVisitCnt = 0, totalRevisitCnt = 0, totalOvertimeRevisitCnt = 0;
-        delay_t ripup_penalty = ctx->getRipupDelayPenalty();
-        RipupScoreboard scores;
+    NetInfo *net_info = ctx->nets.at(net_name).get();
 
-        log_break();
-        log_info("Routing..\n");
+    if (net_info->driver.cell == nullptr)
+        return;
 
-        std::unordered_set<IdString> netsQueue;
+    auto src_bel = net_info->driver.cell->bel;
 
-        for (auto &net_it : ctx->nets) {
-            auto net_name = net_it.first;
-            auto net_info = net_it.second.get();
+    if (src_bel == BelId())
+        log_error("Source cell %s (%s) is not mapped to a bel.\n", net_info->driver.cell->name.c_str(ctx),
+                  net_info->driver.cell->type.c_str(ctx));
 
-            if (net_info->driver.cell == nullptr)
-                continue;
+    IdString driver_port = net_info->driver.port;
 
-            if (!net_info->wires.empty())
-                continue;
+    auto driver_port_it = net_info->driver.cell->pins.find(driver_port);
+    if (driver_port_it != net_info->driver.cell->pins.end())
+        driver_port = driver_port_it->second;
 
-            netsQueue.insert(net_name);
-        }
+    auto src_wire = ctx->getWireBelPin(src_bel, ctx->portPinFromId(driver_port));
 
-        if (netsQueue.empty()) {
-            log_info("found no unrouted nets. no routing necessary.\n");
-            return true;
+    if (src_wire == WireId())
+        log_error("No wire found for port %s (pin %s) on source cell %s "
+                  "(bel %s).\n",
+                  net_info->driver.port.c_str(ctx), driver_port.c_str(ctx), net_info->driver.cell->name.c_str(ctx),
+                  ctx->getBelName(src_bel).c_str(ctx));
+
+    auto &net_cache = cache[net_name];
+
+    if (net_cache.empty())
+        net_cache.resize(net_info->users.size());
+
+    RouteJob job;
+    job.net = net_name;
+    job.user_idx = -1;
+    job.slack = 0;
+    job.randtag = ctx->rng();
+
+    bool got_slack = false;
+
+    for (int user_idx = 0; user_idx < int(net_info->users.size()); user_idx++)
+    {
+        if (net_cache[user_idx])
+            continue;
+
+        auto &user_info = net_info->users[user_idx];
+        auto dst_bel = user_info.cell->bel;
+
+        if (dst_bel == BelId())
+            log_error("Destination cell %s (%s) is not mapped to a bel.\n",
+                      user_info.cell->name.c_str(ctx), user_info.cell->type.c_str(ctx));
+
+        IdString user_port = user_info.port;
+
+        auto user_port_it = user_info.cell->pins.find(user_port);
+
+        if (user_port_it != user_info.cell->pins.end())
+            user_port = user_port_it->second;
+
+        auto dst_wire = ctx->getWireBelPin(dst_bel, ctx->portPinFromId(user_port));
+
+        if (dst_wire == WireId())
+            log_error("No wire found for port %s (pin %s) on destination "
+                      "cell %s (bel %s).\n",
+                      user_info.port.c_str(ctx), user_port.c_str(ctx), user_info.cell->name.c_str(ctx),
+                      ctx->getBelName(dst_bel).c_str(ctx));
+
+        if (user_idx == 0)
+            job.slack = user_info.budget - ctx->estimateDelay(src_wire, dst_wire);
+        else
+            job.slack = std::min(job.slack, user_info.budget - ctx->estimateDelay(src_wire, dst_wire));
+
+        WireId cursor = dst_wire;
+        while (src_wire != cursor) {
+            auto it = net_info->wires.find(cursor);
+            if (it == net_info->wires.end()) {
+                if (!got_slack)
+                    job.slack = user_info.budget - ctx->estimateDelay(src_wire, dst_wire);
+                else
+                    job.slack = std::min(job.slack, user_info.budget - ctx->estimateDelay(src_wire, dst_wire));
+                got_slack = true;
+                break;
+            }
+            NPNR_ASSERT(it->second.pip != PipId());
+            cursor = ctx->getPipSrcWire(it->second.pip);
         }
+    }
 
-        log_info("found %d unrouted nets. starting routing procedure.\n", int(netsQueue.size()));
+    queue.push(job);
 
-        delay_t estimatedTotalDelay = 0.0;
-        int estimatedTotalDelayCnt = 0;
+    for (int user_idx = 0; user_idx < int(net_info->users.size()); user_idx++)
+        net_cache[user_idx] = true;
+}
 
-        for (auto net_name : netsQueue) {
-            auto net_info = ctx->nets.at(net_name).get();
+void addNetRouteJobs(Context *ctx, IdString net_name,
+                     std::unordered_map<IdString, std::vector<bool>> &cache,
+                     std::priority_queue<RouteJob, std::vector<RouteJob>, RouteJob::Greater> &queue)
+{
+    NetInfo *net_info = ctx->nets.at(net_name).get();
 
-            auto src_bel = net_info->driver.cell->bel;
+    if (net_info->driver.cell == nullptr)
+        return;
 
-            if (src_bel == BelId())
-                continue;
+    auto src_bel = net_info->driver.cell->bel;
 
-            IdString driver_port = net_info->driver.port;
+    if (src_bel == BelId())
+        log_error("Source cell %s (%s) is not mapped to a bel.\n", net_info->driver.cell->name.c_str(ctx),
+                  net_info->driver.cell->type.c_str(ctx));
 
-            auto driver_port_it = net_info->driver.cell->pins.find(driver_port);
-            if (driver_port_it != net_info->driver.cell->pins.end())
-                driver_port = driver_port_it->second;
+    IdString driver_port = net_info->driver.port;
 
-            auto src_wire = ctx->getWireBelPin(src_bel, ctx->portPinFromId(driver_port));
+    auto driver_port_it = net_info->driver.cell->pins.find(driver_port);
+    if (driver_port_it != net_info->driver.cell->pins.end())
+        driver_port = driver_port_it->second;
 
-            if (src_wire == WireId())
-                continue;
+    auto src_wire = ctx->getWireBelPin(src_bel, ctx->portPinFromId(driver_port));
 
-            for (auto &user_it : net_info->users) {
-                auto dst_bel = user_it.cell->bel;
+    if (src_wire == WireId())
+        log_error("No wire found for port %s (pin %s) on source cell %s "
+                  "(bel %s).\n",
+                  net_info->driver.port.c_str(ctx), driver_port.c_str(ctx), net_info->driver.cell->name.c_str(ctx),
+                  ctx->getBelName(src_bel).c_str(ctx));
 
-                if (dst_bel == BelId())
-                    continue;
+    auto &net_cache = cache[net_name];
 
-                IdString user_port = user_it.port;
+    if (net_cache.empty())
+        net_cache.resize(net_info->users.size());
 
-                auto user_port_it = user_it.cell->pins.find(user_port);
+    for (int user_idx = 0; user_idx < int(net_info->users.size()); user_idx++)
+    {
+        if (net_cache[user_idx])
+            continue;
 
-                if (user_port_it != user_it.cell->pins.end())
-                    user_port = user_port_it->second;
+        auto &user_info = net_info->users[user_idx];
+        auto dst_bel = user_info.cell->bel;
 
-                auto dst_wire = ctx->getWireBelPin(dst_bel, ctx->portPinFromId(user_port));
+        if (dst_bel == BelId())
+            log_error("Destination cell %s (%s) is not mapped to a bel.\n",
+                      user_info.cell->name.c_str(ctx), user_info.cell->type.c_str(ctx));
 
-                if (dst_wire == WireId())
-                    continue;
+        IdString user_port = user_info.port;
+
+        auto user_port_it = user_info.cell->pins.find(user_port);
+
+        if (user_port_it != user_info.cell->pins.end())
+            user_port = user_port_it->second;
+
+        auto dst_wire = ctx->getWireBelPin(dst_bel, ctx->portPinFromId(user_port));
+
+        if (dst_wire == WireId())
+            log_error("No wire found for port %s (pin %s) on destination "
+                      "cell %s (bel %s).\n",
+                      user_info.port.c_str(ctx), user_port.c_str(ctx), user_info.cell->name.c_str(ctx),
+                      ctx->getBelName(dst_bel).c_str(ctx));
 
-                estimatedTotalDelay += ctx->estimateDelay(src_wire, dst_wire);
-                estimatedTotalDelayCnt++;
+        WireId cursor = dst_wire;
+        while (src_wire != cursor) {
+            auto it = net_info->wires.find(cursor);
+            if (it == net_info->wires.end()) {
+                if (ctx->debug)
+                    log("Adding job [%s %d]: %s %s (%s) -> %s %s (%s)\n",
+                        net_name.c_str(ctx), user_idx,
+                        ctx->getBelName(src_bel).c_str(ctx), driver_port.c_str(ctx),
+                        ctx->getWireName(src_wire).c_str(ctx),
+                        ctx->getBelName(dst_bel).c_str(ctx), user_port.c_str(ctx),
+                        ctx->getWireName(dst_wire).c_str(ctx));
+                RouteJob job;
+                job.net = net_name;
+                job.user_idx = user_idx;
+                job.slack = user_info.budget - ctx->estimateDelay(src_wire, dst_wire);
+                job.randtag = ctx->rng();
+                queue.push(job);
+                net_cache[user_idx] = true;
+                break;
             }
+            NPNR_ASSERT(it->second.pip != PipId());
+            cursor = ctx->getPipSrcWire(it->second.pip);
         }
+    }
+}
 
-        log_info("estimated total wire delay: %.2f (avg %.2f)\n", float(estimatedTotalDelay),
-                 float(estimatedTotalDelay) / estimatedTotalDelayCnt);
+} // namespace
+
+NEXTPNR_NAMESPACE_BEGIN
+
+bool router1(Context *ctx)
+{
+    try {
+        int totalVisitCnt = 0, totalRevisitCnt = 0, totalOvertimeRevisitCnt = 0;
+        delay_t ripup_penalty = ctx->getRipupDelayPenalty();
+        RipupScoreboard scores;
+
+        log_break();
+        log_info("Routing..\n");
+
+        std::unordered_map<IdString, std::vector<bool>> jobCache;
+        std::priority_queue<RouteJob, std::vector<RouteJob>, RouteJob::Greater> jobQueue;
+
+        for (auto &net_it : ctx->nets)
+            addNetRouteJobs(ctx, net_it.first, jobCache, jobQueue);
+
+        if (jobQueue.empty()) {
+            log_info("found no unrouted source-sink pairs. no routing necessary.\n");
+            return true;
+        }
+
+        log_info("found %d unrouted source-sink pairs. starting routing procedure.\n", int(jobQueue.size()));
 
         int iterCnt = 0;
 
-        while (!netsQueue.empty()) {
+        while (!jobQueue.empty()) {
             if (iterCnt == 200) {
                 log_warning("giving up after %d iterations.\n", iterCnt);
                 log_info("Checksum: 0x%08x\n", ctx->checksum());
@@ -498,27 +725,34 @@ bool router1(Context *ctx)
             if (ctx->verbose)
                 log_info("-- %d --\n", iterCnt);
 
-            int visitCnt = 0, revisitCnt = 0, overtimeRevisitCnt = 0, netCnt = 0;
+            int visitCnt = 0, revisitCnt = 0, overtimeRevisitCnt = 0, jobCnt = 0, failedCnt = 0;
 
-            std::unordered_set<IdString> ripupQueue;
+            std::unordered_set<IdString> normalRouteNets, ripupQueue;
 
             if (ctx->verbose || iterCnt == 1)
-                log_info("routing queue contains %d nets.\n", int(netsQueue.size()));
+                log_info("routing queue contains %d jobs.\n", int(jobQueue.size()));
 
-            bool printNets = ctx->verbose && (netsQueue.size() < 10);
+            bool printNets = ctx->verbose && (jobQueue.size() < 10);
 
-            std::vector<IdString> netsArray(netsQueue.begin(), netsQueue.end());
-            ctx->sorted_shuffle(netsArray);
-            netsQueue.clear();
+            while (!jobQueue.empty()) {
+                if(ctx->debug)
+                    log("Next job slack: %f\n", double(jobQueue.top().slack));
 
-            for (auto net_name : netsArray) {
-                if (printNets)
-                    log_info("  routing net %s. (%d users)\n", net_name.c_str(ctx),
-                             int(ctx->nets.at(net_name)->users.size()));
+                auto net_name = jobQueue.top().net;
+                auto user_idx = jobQueue.top().user_idx;
+                jobQueue.pop();
 
-                Router router(ctx, scores, net_name, false);
+                if (printNets) {
+                    if (user_idx < 0)
+                        log_info("  routing all %d users of net %s\n",
+                                 int(ctx->nets.at(net_name)->users.size()), net_name.c_str(ctx));
+                    else
+                        log_info("  routing user %d of net %s\n", user_idx, net_name.c_str(ctx));
+                }
 
-                netCnt++;
+                Router router(ctx, scores, net_name, user_idx, false, false);
+
+                jobCnt++;
                 visitCnt += router.visitCnt;
                 revisitCnt += router.revisitCnt;
                 overtimeRevisitCnt += router.overtimeRevisitCnt;
@@ -527,18 +761,20 @@ bool router1(Context *ctx)
                     if (printNets)
                         log_info("    failed to route to %s.\n", ctx->getWireName(router.failedDest).c_str(ctx));
                     ripupQueue.insert(net_name);
+                    failedCnt++;
+                } else {
+                    normalRouteNets.insert(net_name);
                 }
 
-                if ((ctx->verbose || iterCnt == 1) && !printNets && (netCnt % 100 == 0))
-                    log_info("  processed %d nets. (%d routed, %d failed)\n", netCnt, netCnt - int(ripupQueue.size()),
-                             int(ripupQueue.size()));
+                if ((ctx->verbose || iterCnt == 1) && !printNets && (jobCnt % 100 == 0))
+                    log_info("  processed %d jobs. (%d routed, %d failed)\n", jobCnt, jobCnt - failedCnt, failedCnt);
             }
 
-            int normalRouteCnt = netCnt - int(ripupQueue.size());
+            NPNR_ASSERT(jobQueue.empty());
+            jobCache.clear();
 
-            if ((ctx->verbose || iterCnt == 1) && (netCnt % 100 != 0))
-                log_info("  processed %d nets. (%d routed, %d failed)\n", netCnt, normalRouteCnt,
-                         int(ripupQueue.size()));
+            if ((ctx->verbose || iterCnt == 1) && (jobCnt % 100 != 0))
+                log_info("  processed %d jobs. (%d routed, %d failed)\n", jobCnt, jobCnt - failedCnt, failedCnt);
 
             if (ctx->verbose)
                 log_info("  visited %d PIPs (%.2f%% revisits, %.2f%% overtime "
@@ -556,7 +792,7 @@ bool router1(Context *ctx)
                 visitCnt = 0;
                 revisitCnt = 0;
                 overtimeRevisitCnt = 0;
-                netCnt = 0;
+                int netCnt = 0;
                 int ripCnt = 0;
 
                 std::vector<IdString> ripupArray(ripupQueue.begin(), ripupQueue.end());
@@ -567,7 +803,7 @@ bool router1(Context *ctx)
                         log_info("  routing net %s. (%d users)\n", net_name.c_str(ctx),
                                  int(ctx->nets.at(net_name)->users.size()));
 
-                    Router router(ctx, scores, net_name, true, ripup_penalty);
+                    Router router(ctx, scores, net_name, -1, false, true, ripup_penalty);
 
                     netCnt++;
                     visitCnt += router.visitCnt;
@@ -578,7 +814,7 @@ bool router1(Context *ctx)
                         log_error("Net %s is impossible to route.\n", net_name.c_str(ctx));
 
                     for (auto it : router.rippedNets)
-                        netsQueue.insert(it);
+                        addFullNetRouteJob(ctx, it, jobCache, jobQueue);
 
                     if (printNets) {
                         if (router.rippedNets.size() < 10) {
@@ -604,16 +840,16 @@ bool router1(Context *ctx)
                              "overtime revisits).\n",
                              visitCnt, (100.0 * revisitCnt) / visitCnt, (100.0 * overtimeRevisitCnt) / visitCnt);
 
-                if (ctx->verbose && !netsQueue.empty())
+                if (ctx->verbose && !jobQueue.empty())
                     log_info("  ripped up %d previously routed nets. continue "
                              "routing.\n",
-                             int(netsQueue.size()));
+                             int(jobQueue.size()));
             }
 
             if (!ctx->verbose)
-                log_info("iteration %d: routed %d nets without ripup, routed %d "
-                         "nets with ripup.\n",
-                         iterCnt, normalRouteCnt, int(ripupQueue.size()));
+                log_info("iteration %d: routed %d nets without ripup, routed %d nets with ripup.\n",
+                         iterCnt, int(normalRouteNets.size()), int(ripupQueue.size()));
+
 
             totalVisitCnt += visitCnt;
             totalRevisitCnt += revisitCnt;
@@ -630,6 +866,25 @@ bool router1(Context *ctx)
                  totalVisitCnt, (100.0 * totalRevisitCnt) / totalVisitCnt,
                  (100.0 * totalOvertimeRevisitCnt) / totalVisitCnt);
 
+        NPNR_ASSERT(jobQueue.empty());
+        jobCache.clear();
+
+        for (auto &net_it : ctx->nets)
+            addNetRouteJobs(ctx, net_it.first, jobCache, jobQueue);
+
+#ifndef NDEBUG
+        if (!jobQueue.empty()) {
+            log_info("Design strangely still contains unrouted source-sink pairs:\n");
+            while (!jobQueue.empty()) {
+                log_info("  user %d on net %s.\n", jobQueue.top().user_idx, jobQueue.top().net.c_str(ctx));
+                jobQueue.pop();
+            }
+            log_info("Checksum: 0x%08x\n", ctx->checksum());
+            ctx->check();
+            return false;
+        }
+#endif
+
         log_info("Checksum: 0x%08x\n", ctx->checksum());
 #ifndef NDEBUG
         ctx->check();
diff --git a/ecp5/arch.h b/ecp5/arch.h
index 944aedea..bf36ef2f 100644
--- a/ecp5/arch.h
+++ b/ecp5/arch.h
@@ -578,6 +578,12 @@ struct Arch : BaseCtx
             return wire_to_net.at(wire);
     }
 
+    DelayInfo getWireDelay(WireId wire) const
+    {
+        DelayInfo delay;
+        return delay;
+    }
+
     WireRange getWires() const
     {
         WireRange range;
diff --git a/ecp5/archdefs.h b/ecp5/archdefs.h
index 941607ba..40442e1b 100644
--- a/ecp5/archdefs.h
+++ b/ecp5/archdefs.h
@@ -32,9 +32,14 @@ struct DelayInfo
 {
     delay_t delay = 0;
 
-    delay_t raiseDelay() const { return delay; }
-    delay_t fallDelay() const { return delay; }
-    delay_t avgDelay() const { return delay; }
+    delay_t minRaiseDelay() const { return delay; }
+    delay_t maxRaiseDelay() const { return delay; }
+
+    delay_t minFallDelay() const { return delay; }
+    delay_t maxFallDelay() const { return delay; }
+
+    delay_t minDelay() const { return delay; }
+    delay_t maxDelay() const { return delay; }
 
     DelayInfo operator+(const DelayInfo &other) const
     {
diff --git a/generic/arch.cc b/generic/arch.cc
index 390830aa..b7ec847e 100644
--- a/generic/arch.cc
+++ b/generic/arch.cc
@@ -29,8 +29,8 @@ void Arch::addWire(IdString name, int x, int y)
     NPNR_ASSERT(wires.count(name) == 0);
     WireInfo &wi = wires[name];
     wi.name = name;
-    wi.grid_x = x;
-    wi.grid_y = y;
+    wi.x = x;
+    wi.y = y;
 
     wire_ids.push_back(name);
 }
@@ -62,18 +62,28 @@ void Arch::addAlias(IdString name, IdString srcWire, IdString dstWire, DelayInfo
     pip_ids.push_back(name);
 }
 
-void Arch::addBel(IdString name, IdString type, int x, int y, bool gb)
+void Arch::addBel(IdString name, IdString type, int x, int y, int z, bool gb)
 {
+    Loc loc;
+    loc.x = x;
+    loc.y = y;
+    loc.z = z;
+
     NPNR_ASSERT(bels.count(name) == 0);
+    NPNR_ASSERT(bel_by_loc.count(loc) == 0);
     BelInfo &bi = bels[name];
     bi.name = name;
     bi.type = type;
-    bi.grid_x = x;
-    bi.grid_y = y;
+    bi.x = x;
+    bi.y = y;
+    bi.z = z;
     bi.gb = gb;
 
     bel_ids.push_back(name);
     bel_ids_by_type[type].push_back(name);
+
+    bel_by_loc[loc] = name;
+    bels_by_tile[x][y].push_back(name);
 }
 
 void Arch::addBelInput(IdString bel, IdString name, IdString wire)
@@ -348,8 +358,8 @@ const std::vector<GroupId> &Arch::getGroupGroups(GroupId group) const { return g
 
 void Arch::estimatePosition(BelId bel, int &x, int &y, bool &gb) const
 {
-    x = bels.at(bel).grid_x;
-    y = bels.at(bel).grid_y;
+    x = bels.at(bel).x;
+    y = bels.at(bel).y;
     gb = bels.at(bel).gb;
 }
 
@@ -357,8 +367,8 @@ delay_t Arch::estimateDelay(WireId src, WireId dst) const
 {
     const WireInfo &s = wires.at(src);
     const WireInfo &d = wires.at(dst);
-    int dx = abs(s.grid_x - d.grid_x);
-    int dy = abs(s.grid_y - d.grid_y);
+    int dx = abs(s.x - d.x);
+    int dy = abs(s.y - d.y);
     return (dx + dy) * grid_distance_to_delay;
 }
 
diff --git a/generic/arch.h b/generic/arch.h
index 5d7ac540..e1516569 100644
--- a/generic/arch.h
+++ b/generic/arch.h
@@ -44,7 +44,7 @@ struct WireInfo
     BelPin uphill_bel_pin;
     std::vector<BelPin> downhill_bel_pins;
     DecalXY decalxy;
-    int grid_x, grid_y;
+    int x, y;
 };
 
 struct PinInfo
@@ -59,7 +59,7 @@ struct BelInfo
     IdString name, type, bound_cell;
     std::unordered_map<IdString, PinInfo> pins;
     DecalXY decalxy;
-    int grid_x, grid_y;
+    int x, y, z;
     bool gb;
 };
 
@@ -85,6 +85,9 @@ struct Arch : BaseCtx
     std::vector<IdString> bel_ids, wire_ids, pip_ids;
     std::unordered_map<IdString, std::vector<IdString>> bel_ids_by_type;
 
+    std::unordered_map<Loc, BelId> bel_by_loc;
+    std::unordered_map<int, std::unordered_map<int, std::vector<BelId>>> bels_by_tile;
+
     std::unordered_map<DecalId, std::vector<GraphicElement>> decal_graphics;
     DecalXY frame_decalxy;
 
@@ -94,7 +97,7 @@ struct Arch : BaseCtx
     void addPip(IdString name, IdString srcWire, IdString dstWire, DelayInfo delay);
     void addAlias(IdString name, IdString srcWire, IdString dstWire, DelayInfo delay);
 
-    void addBel(IdString name, IdString type, int x, int y, bool gb);
+    void addBel(IdString name, IdString type, int x, int y, int z, bool gb);
     void addBelInput(IdString bel, IdString name, IdString wire);
     void addBelOutput(IdString bel, IdString name, IdString wire);
     void addBelInout(IdString bel, IdString name, IdString wire);
@@ -129,6 +132,10 @@ struct Arch : BaseCtx
 
     BelId getBelByName(IdString name) const;
     IdString getBelName(BelId bel) const;
+    Loc getBelLocation(BelId bel) const;
+    BelId getBelByLocation(Loc loc) const;
+    std::vector<BelId> getBelsByTile(int x, int y) const;
+    bool getBelGlobalBuf(BelId bel) const;
     uint32_t getBelChecksum(BelId bel) const;
     void bindBel(BelId bel, IdString cell, PlaceStrength strength);
     void unbindBel(BelId bel);
@@ -150,6 +157,7 @@ struct Arch : BaseCtx
     bool checkWireAvail(WireId wire) const;
     IdString getBoundWireNet(WireId wire) const;
     IdString getConflictingWireNet(WireId wire) const;
+    DelayInfo getWireDelay(WireId wire) const { return DelayInfo(); }
     const std::vector<WireId> &getWires() const;
 
     PipId getPipByName(IdString name) const;
diff --git a/generic/archdefs.h b/generic/archdefs.h
index 06d4ec6e..b318d5af 100644
--- a/generic/archdefs.h
+++ b/generic/archdefs.h
@@ -29,11 +29,14 @@ struct DelayInfo
 {
     delay_t delay = 0;
 
-    delay_t raiseDelay() const { return delay; }
+    delay_t minRaiseDelay() const { return delay; }
+    delay_t maxRaiseDelay() const { return delay; }
 
-    delay_t fallDelay() const { return delay; }
+    delay_t minFallDelay() const { return delay; }
+    delay_t maxFallDelay() const { return delay; }
 
-    delay_t avgDelay() const { return delay; }
+    delay_t minDelay() const { return delay; }
+    delay_t maxDelay() const { return delay; }
 
     DelayInfo operator+(const DelayInfo &other) const
     {
diff --git a/gui/basewindow.cc b/gui/basewindow.cc
index 4a225bd6..78c2fe3a 100644
--- a/gui/basewindow.cc
+++ b/gui/basewindow.cc
@@ -116,7 +116,7 @@ void BaseMainWindow::createMenusAndBars()
     actionOpen->setStatusTip("Open an existing project file");

     connect(actionOpen, SIGNAL(triggered()), this, SLOT(open_proj()));

 

-    QAction *actionSave = new QAction("Save", this);

+    actionSave = new QAction("Save", this);

     actionSave->setIcon(QIcon(":/icons/resources/save.png"));

     actionSave->setShortcuts(QKeySequence::Save);

     actionSave->setStatusTip("Save existing project to disk");

diff --git a/gui/basewindow.h b/gui/basewindow.h
index eee426c7..1184fa80 100644
--- a/gui/basewindow.h
+++ b/gui/basewindow.h
@@ -73,6 +73,7 @@ class BaseMainWindow : public QMainWindow
     QStatusBar *statusBar;

     QAction *actionNew;

     QAction *actionOpen;

+    QAction *actionSave;

     QProgressBar *progressBar;

     DesignWidget *designview;

 };

diff --git a/gui/designwidget.cc b/gui/designwidget.cc
index 4123bf30..a59307f0 100644
--- a/gui/designwidget.cc
+++ b/gui/designwidget.cc
@@ -230,6 +230,9 @@ void DesignWidget::addToHistory(QTreeWidgetItem *item)
 void DesignWidget::newContext(Context *ctx)

 {

     treeWidget->clear();

+    // reset pointers since they are not valid after clear

+    nets_root = nullptr;

+    cells_root = nullptr;

     history_ignore = false;

     history_index = -1;

     history.clear();

@@ -334,16 +337,7 @@ void DesignWidget::newContext(Context *ctx)
     for (auto pip : nameToItem[2].toStdMap()) {

         pip_root->addChild(pip.second);

     }

-

-    // Add nets to tree

-    nets_root = new QTreeWidgetItem(treeWidget);

-    nets_root->setText(0, "Nets");

-    treeWidget->insertTopLevelItem(0, nets_root);

-

-    // Add cells to tree

-    cells_root = new QTreeWidgetItem(treeWidget);

-    cells_root->setText(0, "Cells");

-    treeWidget->insertTopLevelItem(0, cells_root);

+    updateTree();

 }

 

 void DesignWidget::updateTree()

@@ -513,6 +507,14 @@ void DesignWidget::onItemSelectionChanged()
         addProperty(topItem, QVariant::String, "Conflicting Net", ctx->getConflictingWireNet(wire).c_str(ctx),

                     ElementType::NET);

 

+        DelayInfo delay = ctx->getWireDelay(wire);

+

+        QtProperty *delayItem = addSubGroup(topItem, "Delay");

+        addProperty(delayItem, QVariant::Double, "Min Raise", delay.minRaiseDelay());

+        addProperty(delayItem, QVariant::Double, "Max Raise", delay.maxRaiseDelay());

+        addProperty(delayItem, QVariant::Double, "Min Fall", delay.minFallDelay());

+        addProperty(delayItem, QVariant::Double, "Max Fall", delay.maxFallDelay());

+

         QtProperty *belpinItem = addSubGroup(topItem, "BelPin Uphill");

         BelPin uphill = ctx->getBelPinUphill(wire);

         if (uphill.bel != BelId())

@@ -535,7 +537,7 @@ void DesignWidget::onItemSelectionChanged()
         }

 

         int counter = 0;

-        QtProperty *pipsDownItem = addSubGroup(downhillItem, "Pips Downhill");

+        QtProperty *pipsDownItem = addSubGroup(topItem, "Pips Downhill");

         for (const auto &item : ctx->getPipsDownhill(wire)) {

             addProperty(pipsDownItem, QVariant::String, "", ctx->getPipName(item).c_str(ctx), ElementType::PIP);

             counter++;

@@ -546,7 +548,7 @@ void DesignWidget::onItemSelectionChanged()
         }

 

         counter = 0;

-        QtProperty *pipsUpItem = addSubGroup(downhillItem, "Pips Uphill");

+        QtProperty *pipsUpItem = addSubGroup(topItem, "Pips Uphill");

         for (const auto &item : ctx->getPipsUphill(wire)) {

             addProperty(pipsUpItem, QVariant::String, "", ctx->getPipName(item).c_str(ctx), ElementType::PIP);

             counter++;

@@ -572,9 +574,10 @@ void DesignWidget::onItemSelectionChanged()
         DelayInfo delay = ctx->getPipDelay(pip);

 

         QtProperty *delayItem = addSubGroup(topItem, "Delay");

-        addProperty(delayItem, QVariant::Double, "Raise", delay.raiseDelay());

-        addProperty(delayItem, QVariant::Double, "Fall", delay.fallDelay());

-        addProperty(delayItem, QVariant::Double, "Average", delay.avgDelay());

+        addProperty(delayItem, QVariant::Double, "Min Raise", delay.minRaiseDelay());

+        addProperty(delayItem, QVariant::Double, "Max Raise", delay.maxRaiseDelay());

+        addProperty(delayItem, QVariant::Double, "Min Fall", delay.minFallDelay());

+        addProperty(delayItem, QVariant::Double, "Max Fall", delay.maxFallDelay());

     } else if (type == ElementType::NET) {

         NetInfo *net = ctx->nets.at(c).get();

 

diff --git a/gui/ice40/mainwindow.cc b/gui/ice40/mainwindow.cc
index 28792ed3..847698c5 100644
--- a/gui/ice40/mainwindow.cc
+++ b/gui/ice40/mainwindow.cc
@@ -20,9 +20,12 @@
 #include "mainwindow.h"

 #include <QAction>

 #include <QFileDialog>

+#include <QFileInfo>

 #include <QIcon>

 #include <QInputDialog>

 #include <QLineEdit>

+#include <boost/property_tree/json_parser.hpp>

+#include <boost/property_tree/ptree.hpp>

 #include "bitstream.h"

 #include "design_utils.h"

 #include "jsonparse.h"

@@ -219,9 +222,11 @@ void MainWindow::new_proj()
         QString package = QInputDialog::getItem(this, "Select package", "Package:", getSupportedPackages(chipArgs.type),

                                                 0, false, &ok);

 

-        if (ok && !item.isEmpty()) {

+        if (ok && !item.isEmpty()) {            

+            currentProj = "";

+            currentJson = "";

+            currentPCF = "";

             disableActions();

-            preload_pcf = "";

             chipArgs.package = package.toStdString().c_str();

             ctx = std::unique_ptr<Context>(new Context(chipArgs));

             actionLoadJSON->setEnabled(true);

@@ -233,14 +238,16 @@ void MainWindow::new_proj()
 

 void MainWindow::load_json(std::string filename, std::string pcf)

 {

-    preload_pcf = pcf;

     disableActions();

+    currentJson = filename;

+    currentPCF = pcf;

     Q_EMIT task->loadfile(filename);

 }

 

 void MainWindow::load_pcf(std::string filename)

 {

     disableActions();

+    currentPCF = filename;

     Q_EMIT task->loadpcf(filename);

 }

 

@@ -252,10 +259,79 @@ void MainWindow::newContext(Context *ctx)
 

 void MainWindow::open_proj()

 {

+    QMap<std::string, int> arch;

+#ifdef ICE40_HX1K_ONLY

+    arch.insert("hx1k", ArchArgs::HX1K);

+#else

+    arch.insert("lp384", ArchArgs::LP384);

+    arch.insert("lp1k", ArchArgs::LP1K);

+    arch.insert("hx1k", ArchArgs::HX1K);

+    arch.insert("up5k", ArchArgs::UP5K);

+    arch.insert("lp8k", ArchArgs::LP8K);

+    arch.insert("hx8k", ArchArgs::HX8K);

+#endif

+

     QString fileName = QFileDialog::getOpenFileName(this, QString("Open Project"), QString(), QString("*.proj"));

     if (!fileName.isEmpty()) {

-        std::string fn = fileName.toStdString();

-        disableActions();

+        try {

+            namespace pt = boost::property_tree;

+

+            std::string fn = fileName.toStdString();

+            currentProj = fn;

+            disableActions();

+

+            pt::ptree root;

+            std::string filename = fileName.toStdString();

+            pt::read_json(filename, root);

+            log_info("Loading project %s...\n", filename.c_str());

+            log_break();

+

+            int version = root.get<int>("project.version");

+            if (version != 1)

+                log_error("Wrong project format version.\n");

+

+            std::string arch_name = root.get<std::string>("project.arch.name");

+            if (arch_name != "ice40")

+                log_error("Unsuported project architecture.\n");

+

+            std::string arch_type = root.get<std::string>("project.arch.type");

+            std::string arch_package = root.get<std::string>("project.arch.package");

+

+            chipArgs.type = (ArchArgs::ArchArgsTypes)arch.value(arch_type);

+            chipArgs.package = arch_package;

+            ctx = std::unique_ptr<Context>(new Context(chipArgs));

+            Q_EMIT contextChanged(ctx.get());

+

+            QFileInfo fi(fileName);

+            QDir::setCurrent(fi.absoluteDir().absolutePath());

+            log_info("Setting current dir to %s...\n", fi.absoluteDir().absolutePath().toStdString().c_str());

+            log_info("Loading project %s...\n", filename.c_str());

+            log_info("Context changed to %s (%s)\n", arch_type.c_str(), arch_package.c_str());

+

+            auto project = root.get_child("project");

+            std::string json;

+            std::string pcf;

+            if (project.count("input")) {

+                auto input = project.get_child("input");

+                if (input.count("json"))

+                    json = input.get<std::string>("json");

+                if (input.count("pcf"))

+                    pcf = input.get<std::string>("pcf");

+            }

+

+            if (!(QFileInfo::exists(json.c_str()) && QFileInfo(json.c_str()).isFile())) {

+                log_error("Json file does not exist.\n");

+            }

+            if (!pcf.empty()) {

+                if (!(QFileInfo::exists(pcf.c_str()) && QFileInfo(pcf.c_str()).isFile())) {

+                    log_error("PCF file does not exist.\n");

+                }

+            }

+

+            log_info("Loading json: %s...\n", json.c_str());

+            load_json(json, pcf);

+        } catch (log_execution_error_exception) {

+        }

     }

 }

 

@@ -275,7 +351,35 @@ void MainWindow::open_pcf()
     }

 }

 

-bool MainWindow::save_proj() { return false; }

+bool MainWindow::save_proj()

+{

+    if (currentProj.empty()) {

+        QString fileName = QFileDialog::getSaveFileName(this, QString("Save Project"), QString(), QString("*.proj"));

+        if (fileName.isEmpty())

+            return false;

+        currentProj = fileName.toStdString();

+    }

+    if (!currentProj.empty()) {

+        namespace pt = boost::property_tree;

+        QFileInfo fi(currentProj.c_str());

+        QDir dir(fi.absoluteDir().absolutePath());

+        std::ofstream f(currentProj);

+        pt::ptree root;

+        root.put("project.version", 1);

+        root.put("project.name", fi.baseName().toStdString());

+        root.put("project.arch.name", ctx->archId().c_str(ctx.get()));

+        root.put("project.arch.type", ctx->archArgsToId(chipArgs).c_str(ctx.get()));

+        root.put("project.arch.package", chipArgs.package);

+        if (!currentJson.empty())

+            root.put("project.input.json", dir.relativeFilePath(currentJson.c_str()).toStdString());

+        if (!currentPCF.empty())

+            root.put("project.input.pcf", dir.relativeFilePath(currentPCF.c_str()).toStdString());

+        pt::write_json(f, root);

+        log_info("Project %s saved...\n", fi.baseName().toStdString().c_str());

+        return true;

+    }

+    return false;

+}

 

 void MainWindow::save_asc()

 {

@@ -303,6 +407,7 @@ void MainWindow::disableActions()
 

     actionNew->setEnabled(true);

     actionOpen->setEnabled(true);

+    actionSave->setEnabled(!currentJson.empty());

 }

 

 void MainWindow::loadfile_finished(bool status)

@@ -312,12 +417,12 @@ void MainWindow::loadfile_finished(bool status)
         log("Loading design successful.\n");

         actionLoadPCF->setEnabled(true);

         actionPack->setEnabled(true);

-        if (!preload_pcf.empty())

-            load_pcf(preload_pcf);

+        if (!currentPCF.empty())

+            load_pcf(currentPCF);

         Q_EMIT updateTreeView();

     } else {

         log("Loading design failed.\n");

-        preload_pcf = "";

+        currentPCF = "";

     }

 }

 

diff --git a/gui/ice40/mainwindow.h b/gui/ice40/mainwindow.h
index cfd938f8..4600d1da 100644
--- a/gui/ice40/mainwindow.h
+++ b/gui/ice40/mainwindow.h
@@ -79,7 +79,10 @@ class MainWindow : public BaseMainWindow
 

     bool timing_driven;

     ArchArgs chipArgs;

-    std::string preload_pcf;

+

+    std::string currentProj;

+    std::string currentJson;

+    std::string currentPCF;

 };

 

 NEXTPNR_NAMESPACE_END

diff --git a/ice40/arch.cc b/ice40/arch.cc
index 1aa02294..e9a7d2b6 100644
--- a/ice40/arch.cc
+++ b/ice40/arch.cc
@@ -25,7 +25,7 @@
 #include "placer1.h"
 #include "router1.h"
 #include "util.h"
-
+#include "cells.h"
 NEXTPNR_NAMESPACE_BEGIN
 
 // -----------------------------------------------------------------------
@@ -255,11 +255,52 @@ BelId Arch::getBelByName(IdString name) const
     return ret;
 }
 
+BelId Arch::getBelByLocation(Loc loc) const
+{
+    BelId bel;
+
+    if (bel_by_loc.empty()) {
+        for (int i = 0; i < chip_info->num_bels; i++) {
+            BelId b;
+            b.index = i;
+            bel_by_loc[getBelLocation(b)] = i;
+        }
+    }
+
+    auto it = bel_by_loc.find(loc);
+    if (it != bel_by_loc.end())
+        bel.index = it->second;
+
+    return bel;
+}
+
+BelRange Arch::getBelsByTile(int x, int y) const
+{
+    // In iCE40 chipdb bels at the same tile are consecutive and dense z ordinates are used
+    BelRange br;
+
+    Loc loc;
+    loc.x = x;
+    loc.y = y;
+    loc.z = 0;
+
+    br.b.cursor = Arch::getBelByLocation(loc).index;
+    br.e.cursor = br.b.cursor;
+
+    if (br.e.cursor != -1) {
+        while (br.e.cursor < chip_info->num_bels &&
+               chip_info->bel_data[br.e.cursor].x == x &&
+               chip_info->bel_data[br.e.cursor].y == y)
+            br.e.cursor++;
+    }
+
+    return br;
+}
+
 BelRange Arch::getBelsAtSameTile(BelId bel) const
 {
     BelRange br;
     NPNR_ASSERT(bel != BelId());
-    // This requires Bels at the same tile are consecutive
     int x = chip_info->bel_data[bel.index].x;
     int y = chip_info->bel_data[bel.index].y;
     int start = bel.index, end = bel.index;
@@ -704,6 +745,14 @@ void Arch::assignArchInfo()
         NetInfo *ni = net.second.get();
         if (isGlobalNet(ni))
             ni->is_global = true;
+        ni->is_enable = false;
+        ni->is_reset = false;
+        for (auto usr : ni->users) {
+            if (is_enable_port(this, usr))
+                ni->is_enable = true;
+            if (is_reset_port(this, usr))
+                ni->is_reset = true;
+        }
     }
     for (auto &cell : getCtx()->cells) {
         CellInfo *ci = cell.second.get();
diff --git a/ice40/arch.h b/ice40/arch.h
index 3b6d23dc..21169298 100644
--- a/ice40/arch.h
+++ b/ice40/arch.h
@@ -350,6 +350,7 @@ struct Arch : BaseCtx
     mutable std::unordered_map<IdString, int> bel_by_name;
     mutable std::unordered_map<IdString, int> wire_by_name;
     mutable std::unordered_map<IdString, int> pip_by_name;
+    mutable std::unordered_map<Loc, int> bel_by_loc;
 
     std::vector<IdString> bel_to_cell;
     std::vector<IdString> wire_to_net;
@@ -440,7 +441,24 @@ struct Arch : BaseCtx
         return range;
     }
 
-    BelRange getBelsAtSameTile(BelId bel) const;
+    Loc getBelLocation(BelId bel) const
+    {
+        Loc loc;
+        loc.x = chip_info->bel_data[bel.index].x;
+        loc.y = chip_info->bel_data[bel.index].y;
+        loc.z = chip_info->bel_data[bel.index].z;
+        return loc;
+    }
+
+    BelId getBelByLocation(Loc loc) const;
+    BelRange getBelsByTile(int x, int y) const;
+
+    bool getBelGlobalBuf(BelId bel) const
+    {
+        return chip_info->bel_data[bel.index].type == TYPE_SB_GB;
+    }
+
+    BelRange getBelsAtSameTile(BelId bel) const NPNR_DEPRECATED;
 
     BelType getBelType(BelId bel) const
     {
@@ -530,6 +548,12 @@ struct Arch : BaseCtx
         return wire_to_net[wire.index];
     }
 
+    DelayInfo getWireDelay(WireId wire) const
+    {
+        DelayInfo delay;
+        return delay;
+    }
+
     WireRange getWires() const
     {
         WireRange range;
@@ -671,7 +695,7 @@ struct Arch : BaseCtx
 
     // -------------------------------------------------
 
-    void estimatePosition(BelId bel, int &x, int &y, bool &gb) const;
+    void estimatePosition(BelId bel, int &x, int &y, bool &gb) const NPNR_DEPRECATED;
     delay_t estimateDelay(WireId src, WireId dst) const;
     delay_t getDelayEpsilon() const { return 20; }
     delay_t getRipupDelayPenalty() const { return 200; }
diff --git a/ice40/arch_place.cc b/ice40/arch_place.cc
index 1f2943a0..116ab7d3 100644
--- a/ice40/arch_place.cc
+++ b/ice40/arch_place.cc
@@ -108,21 +108,15 @@ bool Arch::isValidBelForCell(CellInfo *cell, BelId bel) const
     } else if (cell->type == id_sb_io) {
         return getBelPackagePin(bel) != "";
     } else if (cell->type == id_sb_gb) {
-        bool is_reset = false, is_cen = false;
         NPNR_ASSERT(cell->ports.at(id_glb_buf_out).net != nullptr);
-        for (auto user : cell->ports.at(id_glb_buf_out).net->users) {
-            if (is_reset_port(this, user))
-                is_reset = true;
-            if (is_enable_port(this, user))
-                is_cen = true;
-        }
+        const NetInfo *net = cell->ports.at(id_glb_buf_out).net;
         IdString glb_net = getWireName(getWireBelPin(bel, PIN_GLOBAL_BUFFER_OUTPUT));
         int glb_id = std::stoi(std::string("") + glb_net.str(this).back());
-        if (is_reset && is_cen)
+        if (net->is_reset && net->is_enable)
             return false;
-        else if (is_reset)
+        else if (net->is_reset)
             return (glb_id % 2) == 0;
-        else if (is_cen)
+        else if (net->is_enable)
             return (glb_id % 2) == 1;
         else
             return true;
diff --git a/ice40/archdefs.h b/ice40/archdefs.h
index 55e2c2fb..8a7449a8 100644
--- a/ice40/archdefs.h
+++ b/ice40/archdefs.h
@@ -21,8 +21,6 @@
 #error Include "archdefs.h" via "nextpnr.h" only.
 #endif
 
-#include <boost/functional/hash.hpp>
-
 NEXTPNR_NAMESPACE_BEGIN
 
 typedef int delay_t;
@@ -31,9 +29,14 @@ struct DelayInfo
 {
     delay_t delay = 0;
 
-    delay_t raiseDelay() const { return delay; }
-    delay_t fallDelay() const { return delay; }
-    delay_t avgDelay() const { return delay; }
+    delay_t minRaiseDelay() const { return delay; }
+    delay_t maxRaiseDelay() const { return delay; }
+
+    delay_t minFallDelay() const { return delay; }
+    delay_t maxFallDelay() const { return delay; }
+
+    delay_t minDelay() const { return delay; }
+    delay_t maxDelay() const { return delay; }
 
     DelayInfo operator+(const DelayInfo &other) const
     {
@@ -153,6 +156,7 @@ struct DecalId
 struct ArchNetInfo
 {
     bool is_global = false;
+    bool is_reset = false, is_enable = false;
 };
 
 struct NetInfo;
diff --git a/ice40/bitstream.cc b/ice40/bitstream.cc
index c12fa90e..7fd3f8ac 100644
--- a/ice40/bitstream.cc
+++ b/ice40/bitstream.cc
@@ -1,529 +1,788 @@
-/*
- *  nextpnr -- Next Generation Place and Route
- *
- *  Copyright (C) 2018  Clifford Wolf <clifford@symbioticeda.com>
- *  Copyright (C) 2018  David Shah <david@symbioticeda.com>
- *
- *  Permission to use, copy, modify, and/or distribute this software for any
- *  purpose with or without fee is hereby granted, provided that the above
- *  copyright notice and this permission notice appear in all copies.
- *
- *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- */
-#include "bitstream.h"
-#include <cctype>
-#include <vector>
-#include "log.h"
-
-NEXTPNR_NAMESPACE_BEGIN
-
-inline TileType tile_at(const Context *ctx, int x, int y)
-{
-    return ctx->chip_info->tile_grid[y * ctx->chip_info->width + x];
-}
-
-const ConfigEntryPOD &find_config(const TileInfoPOD &tile, const std::string &name)
-{
-    for (int i = 0; i < tile.num_config_entries; i++) {
-        if (std::string(tile.entries[i].name.get()) == name) {
-            return tile.entries[i];
-        }
-    }
-    NPNR_ASSERT_FALSE_STR("unable to find config bit " + name);
-}
-
-std::tuple<int8_t, int8_t, int8_t> get_ieren(const BitstreamInfoPOD &bi, int8_t x, int8_t y, int8_t z)
-{
-    for (int i = 0; i < bi.num_ierens; i++) {
-        auto ie = bi.ierens[i];
-        if (ie.iox == x && ie.ioy == y && ie.ioz == z) {
-            return std::make_tuple(ie.ierx, ie.iery, ie.ierz);
-        }
-    }
-    // No pin at this location
-    return std::make_tuple(-1, -1, -1);
-};
-
-void set_config(const TileInfoPOD &ti, std::vector<std::vector<int8_t>> &tile_cfg, const std::string &name, bool value,
-                int index = -1)
-{
-    const ConfigEntryPOD &cfg = find_config(ti, name);
-    if (index == -1) {
-        for (int i = 0; i < cfg.num_bits; i++) {
-            int8_t &cbit = tile_cfg.at(cfg.bits[i].row).at(cfg.bits[i].col);
-            if (cbit && !value)
-                log_error("clearing already set config bit %s", name.c_str());
-            cbit = value;
-        }
-    } else {
-        int8_t &cbit = tile_cfg.at(cfg.bits[index].row).at(cfg.bits[index].col);
-        cbit = value;
-        if (cbit && !value)
-            log_error("clearing already set config bit %s[%d]", name.c_str(), index);
-    }
-}
-
-int get_param_or_def(const CellInfo *cell, const IdString param, int defval = 0)
-{
-    auto found = cell->params.find(param);
-    if (found != cell->params.end())
-        return std::stoi(found->second);
-    else
-        return defval;
-}
-
-std::string get_param_str_or_def(const CellInfo *cell, const IdString param, std::string defval = "")
-{
-    auto found = cell->params.find(param);
-    if (found != cell->params.end())
-        return found->second;
-    else
-        return defval;
-}
-
-char get_hexdigit(int i) { return std::string("0123456789ABCDEF").at(i); }
-
-static const BelConfigPOD &get_ec_config(const ChipInfoPOD *chip, BelId bel)
-{
-    for (int i = 0; i < chip->num_belcfgs; i++) {
-        if (chip->bel_config[i].bel_index == bel.index)
-            return chip->bel_config[i];
-    }
-    NPNR_ASSERT_FALSE("failed to find bel config");
-}
-
-typedef std::vector<std::vector<std::vector<std::vector<int8_t>>>> chipconfig_t;
-
-static void set_ec_cbit(chipconfig_t &config, const Context *ctx, const BelConfigPOD &cell_cbits, std::string name,
-                        bool value)
-{
-    const ChipInfoPOD *chip = ctx->chip_info;
-
-    for (int i = 0; i < cell_cbits.num_entries; i++) {
-        const auto &cbit = cell_cbits.entries[i];
-        if (cbit.entry_name.get() == name) {
-            const auto &ti = chip->bits_info->tiles_nonrouting[tile_at(ctx, cbit.x, cbit.y)];
-            set_config(ti, config.at(cbit.y).at(cbit.x), std::string("IpConfig.") + cbit.cbit_name.get(), value);
-            return;
-        }
-    }
-    NPNR_ASSERT_FALSE_STR("failed to config extra cell config bit " + name);
-}
-
-void configure_extra_cell(chipconfig_t &config, const Context *ctx, CellInfo *cell,
-                          const std::vector<std::pair<std::string, int>> &params, bool string_style)
-{
-    const ChipInfoPOD *chip = ctx->chip_info;
-    const auto &bc = get_ec_config(chip, cell->bel);
-    for (auto p : params) {
-        std::vector<bool> value;
-        if (string_style) {
-            // Lattice's weird string style params, not sure if
-            // prefixes other than 0b should be supported, only 0b features in docs
-            std::string raw = get_param_str_or_def(cell, ctx->id(p.first), "0b0");
-            assert(raw.substr(0, 2) == "0b");
-            raw = raw.substr(2);
-            value.resize(raw.length());
-            for (int i = 0; i < (int)raw.length(); i++) {
-                if (raw[i] == '1') {
-                    value[(raw.length() - 1) - i] = 1;
-                } else {
-                    assert(raw[i] == '0');
-                    value[(raw.length() - 1) - i] = 0;
-                }
-            }
-        } else {
-            int ival = get_param_or_def(cell, ctx->id(p.first), 0);
-
-            for (int i = 0; i < p.second; i++)
-                value.push_back((ival >> i) & 0x1);
-        }
-
-        value.resize(p.second);
-        if (p.second == 1) {
-            set_ec_cbit(config, ctx, bc, p.first, value.at(0));
-        } else {
-            for (int i = 0; i < p.second; i++) {
-                set_ec_cbit(config, ctx, bc, p.first + "_" + std::to_string(i), value.at(i));
-            }
-        }
-    }
-}
-
-void write_asc(const Context *ctx, std::ostream &out)
-{
-    // [y][x][row][col]
-    const ChipInfoPOD &ci = *ctx->chip_info;
-    const BitstreamInfoPOD &bi = *ci.bits_info;
-    chipconfig_t config;
-    config.resize(ci.height);
-    for (int y = 0; y < ci.height; y++) {
-        config.at(y).resize(ci.width);
-        for (int x = 0; x < ci.width; x++) {
-            TileType tile = tile_at(ctx, x, y);
-            int rows = bi.tiles_nonrouting[tile].rows;
-            int cols = bi.tiles_nonrouting[tile].cols;
-            config.at(y).at(x).resize(rows, std::vector<int8_t>(cols));
-        }
-    }
-    out << ".comment from next-pnr" << std::endl;
-
-    switch (ctx->args.type) {
-    case ArchArgs::LP384:
-        out << ".device 384" << std::endl;
-        break;
-    case ArchArgs::HX1K:
-    case ArchArgs::LP1K:
-        out << ".device 1k" << std::endl;
-        break;
-    case ArchArgs::HX8K:
-    case ArchArgs::LP8K:
-        out << ".device 8k" << std::endl;
-        break;
-    case ArchArgs::UP5K:
-        out << ".device 5k" << std::endl;
-        break;
-    default:
-        NPNR_ASSERT_FALSE("unsupported device type");
-    }
-    // Set pips
-    for (auto pip : ctx->getPips()) {
-        if (ctx->pip_to_net[pip.index] != IdString()) {
-            const PipInfoPOD &pi = ci.pip_data[pip.index];
-            const SwitchInfoPOD &swi = bi.switches[pi.switch_index];
-            for (int i = 0; i < swi.num_bits; i++) {
-                bool val = (pi.switch_mask & (1 << ((swi.num_bits - 1) - i))) != 0;
-                int8_t &cbit = config.at(swi.y).at(swi.x).at(swi.cbits[i].row).at(swi.cbits[i].col);
-                if (bool(cbit) != 0)
-                    NPNR_ASSERT(false);
-                cbit = val;
-            }
-        }
-    }
-    // Set logic cell config
-    for (auto &cell : ctx->cells) {
-        BelId bel = cell.second.get()->bel;
-        if (bel == BelId()) {
-            std::cout << "Found unplaced cell " << cell.first.str(ctx) << " while generating bitstream!" << std::endl;
-            continue;
-        }
-        const BelInfoPOD &beli = ci.bel_data[bel.index];
-        int x = beli.x, y = beli.y, z = beli.z;
-        if (cell.second->type == ctx->id("ICESTORM_LC")) {
-            const TileInfoPOD &ti = bi.tiles_nonrouting[TILE_LOGIC];
-            unsigned lut_init = get_param_or_def(cell.second.get(), ctx->id("LUT_INIT"));
-            bool neg_clk = get_param_or_def(cell.second.get(), ctx->id("NEG_CLK"));
-            bool dff_enable = get_param_or_def(cell.second.get(), ctx->id("DFF_ENABLE"));
-            bool async_sr = get_param_or_def(cell.second.get(), ctx->id("ASYNC_SR"));
-            bool set_noreset = get_param_or_def(cell.second.get(), ctx->id("SET_NORESET"));
-            bool carry_enable = get_param_or_def(cell.second.get(), ctx->id("CARRY_ENABLE"));
-            std::vector<bool> lc(20, false);
-            // From arachne-pnr
-            static std::vector<int> lut_perm = {
-                    4, 14, 15, 5, 6, 16, 17, 7, 3, 13, 12, 2, 1, 11, 10, 0,
-            };
-            for (int i = 0; i < 16; i++) {
-                if ((lut_init >> i) & 0x1)
-                    lc.at(lut_perm.at(i)) = true;
-            }
-            lc.at(8) = carry_enable;
-            lc.at(9) = dff_enable;
-            lc.at(18) = set_noreset;
-            lc.at(19) = async_sr;
-
-            for (int i = 0; i < 20; i++)
-                set_config(ti, config.at(y).at(x), "LC_" + std::to_string(z), lc.at(i), i);
-            if (dff_enable)
-                set_config(ti, config.at(y).at(x), "NegClk", neg_clk);
-
-            bool carry_const = get_param_or_def(cell.second.get(), ctx->id("CIN_CONST"));
-            bool carry_set = get_param_or_def(cell.second.get(), ctx->id("CIN_SET"));
-            if (carry_const) {
-                if (!ctx->force)
-                    NPNR_ASSERT(z == 0);
-                set_config(ti, config.at(y).at(x), "CarryInSet", carry_set);
-            }
-        } else if (cell.second->type == ctx->id("SB_IO")) {
-            const TileInfoPOD &ti = bi.tiles_nonrouting[TILE_IO];
-            unsigned pin_type = get_param_or_def(cell.second.get(), ctx->id("PIN_TYPE"));
-            bool neg_trigger = get_param_or_def(cell.second.get(), ctx->id("NEG_TRIGGER"));
-            bool pullup = get_param_or_def(cell.second.get(), ctx->id("PULLUP"));
-            for (int i = 0; i < 6; i++) {
-                bool val = (pin_type >> i) & 0x01;
-                set_config(ti, config.at(y).at(x), "IOB_" + std::to_string(z) + ".PINTYPE_" + std::to_string(i), val);
-            }
-            set_config(ti, config.at(y).at(x), "NegClk", neg_trigger);
-            auto ieren = get_ieren(bi, x, y, z);
-            int iex, iey, iez;
-            std::tie(iex, iey, iez) = ieren;
-            NPNR_ASSERT(iez != -1);
-
-            bool input_en = false;
-            if ((ctx->wire_to_net[ctx->getWireBelPin(bel, PIN_D_IN_0).index] != IdString()) ||
-                (ctx->wire_to_net[ctx->getWireBelPin(bel, PIN_D_IN_1).index] != IdString())) {
-                input_en = true;
-            }
-
-            if (ctx->args.type == ArchArgs::LP1K || ctx->args.type == ArchArgs::HX1K) {
-                set_config(ti, config.at(iey).at(iex), "IoCtrl.IE_" + std::to_string(iez), !input_en);
-                set_config(ti, config.at(iey).at(iex), "IoCtrl.REN_" + std::to_string(iez), !pullup);
-            } else {
-                set_config(ti, config.at(iey).at(iex), "IoCtrl.IE_" + std::to_string(iez), input_en);
-                set_config(ti, config.at(iey).at(iex), "IoCtrl.REN_" + std::to_string(iez), !pullup);
-            }
-
-            if (ctx->args.type == ArchArgs::UP5K) {
-                if (iez == 0) {
-                    set_config(ti, config.at(iey).at(iex), "IoCtrl.cf_bit_39", !pullup);
-                } else if (iez == 1) {
-                    set_config(ti, config.at(iey).at(iex), "IoCtrl.cf_bit_35", !pullup);
-                }
-            }
-        } else if (cell.second->type == ctx->id("SB_GB")) {
-            // no cell config bits
-        } else if (cell.second->type == ctx->id("ICESTORM_RAM")) {
-            const BelInfoPOD &beli = ci.bel_data[bel.index];
-            int x = beli.x, y = beli.y;
-            const TileInfoPOD &ti_ramt = bi.tiles_nonrouting[TILE_RAMT];
-            const TileInfoPOD &ti_ramb = bi.tiles_nonrouting[TILE_RAMB];
-            if (!(ctx->args.type == ArchArgs::LP1K || ctx->args.type == ArchArgs::HX1K)) {
-                set_config(ti_ramb, config.at(y).at(x), "RamConfig.PowerUp", true);
-            }
-            bool negclk_r = get_param_or_def(cell.second.get(), ctx->id("NEG_CLK_R"));
-            bool negclk_w = get_param_or_def(cell.second.get(), ctx->id("NEG_CLK_W"));
-            int write_mode = get_param_or_def(cell.second.get(), ctx->id("WRITE_MODE"));
-            int read_mode = get_param_or_def(cell.second.get(), ctx->id("READ_MODE"));
-            set_config(ti_ramb, config.at(y).at(x), "NegClk", negclk_w);
-            set_config(ti_ramt, config.at(y + 1).at(x), "NegClk", negclk_r);
-
-            set_config(ti_ramt, config.at(y + 1).at(x), "RamConfig.CBIT_0", write_mode & 0x1);
-            set_config(ti_ramt, config.at(y + 1).at(x), "RamConfig.CBIT_1", write_mode & 0x2);
-            set_config(ti_ramt, config.at(y + 1).at(x), "RamConfig.CBIT_2", read_mode & 0x1);
-            set_config(ti_ramt, config.at(y + 1).at(x), "RamConfig.CBIT_3", read_mode & 0x2);
-        } else if (cell.second->type == ctx->id("SB_WARMBOOT") || cell.second->type == ctx->id("ICESTORM_LFOSC")) {
-            // No config needed
-        } else if (cell.second->type == ctx->id("ICESTORM_SPRAM")) {
-            const BelInfoPOD &beli = ci.bel_data[bel.index];
-            int x = beli.x, y = beli.y, z = beli.z;
-            NPNR_ASSERT(ctx->args.type == ArchArgs::UP5K);
-            if (x == 0 && y == 0) {
-                const TileInfoPOD &ti_ipcon = bi.tiles_nonrouting[TILE_IPCON];
-                if (z == 1) {
-                    set_config(ti_ipcon, config.at(1).at(0), "IpConfig.CBIT_0", true);
-                } else if (z == 2) {
-                    set_config(ti_ipcon, config.at(1).at(0), "IpConfig.CBIT_1", true);
-                } else {
-                    NPNR_ASSERT(false);
-                }
-            } else if (x == 25 && y == 0) {
-                const TileInfoPOD &ti_ipcon = bi.tiles_nonrouting[TILE_IPCON];
-                if (z == 3) {
-                    set_config(ti_ipcon, config.at(1).at(25), "IpConfig.CBIT_0", true);
-                } else if (z == 4) {
-                    set_config(ti_ipcon, config.at(1).at(25), "IpConfig.CBIT_1", true);
-                } else {
-                    NPNR_ASSERT(false);
-                }
-            }
-        } else if (cell.second->type == ctx->id("ICESTORM_DSP")) {
-            const std::vector<std::pair<std::string, int>> mac16_params = {{"C_REG", 1},
-                                                                           {"A_REG", 1},
-                                                                           {"B_REG", 1},
-                                                                           {"D_REG", 1},
-                                                                           {"TOP_8x8_MULT_REG", 1},
-                                                                           {"BOT_8x8_MULT_REG", 1},
-                                                                           {"PIPELINE_16x16_MULT_REG1", 1},
-                                                                           {"PIPELINE_16x16_MULT_REG2", 1},
-                                                                           {"TOPOUTPUT_SELECT", 2},
-                                                                           {"TOPADDSUB_LOWERINPUT", 2},
-                                                                           {"TOPADDSUB_UPPERINPUT", 1},
-                                                                           {"TOPADDSUB_CARRYSELECT", 2},
-                                                                           {"BOTOUTPUT_SELECT", 2},
-                                                                           {"BOTADDSUB_LOWERINPUT", 2},
-                                                                           {"BOTADDSUB_UPPERINPUT", 1},
-                                                                           {"BOTADDSUB_CARRYSELECT", 2},
-                                                                           {"MODE_8x8", 1},
-                                                                           {"A_SIGNED", 1},
-                                                                           {"B_SIGNED", 1}};
-            configure_extra_cell(config, ctx, cell.second.get(), mac16_params, false);
-        } else {
-            NPNR_ASSERT(false);
-        }
-    }
-    // Set config bits in unused IO and RAM
-    for (auto bel : ctx->getBels()) {
-        if (ctx->bel_to_cell[bel.index] == IdString() && ctx->getBelType(bel) == TYPE_SB_IO) {
-            const TileInfoPOD &ti = bi.tiles_nonrouting[TILE_IO];
-            const BelInfoPOD &beli = ci.bel_data[bel.index];
-            int x = beli.x, y = beli.y, z = beli.z;
-            auto ieren = get_ieren(bi, x, y, z);
-            int iex, iey, iez;
-            std::tie(iex, iey, iez) = ieren;
-            if (iez != -1) {
-                if (ctx->args.type == ArchArgs::LP1K || ctx->args.type == ArchArgs::HX1K) {
-                    set_config(ti, config.at(iey).at(iex), "IoCtrl.IE_" + std::to_string(iez), true);
-                    set_config(ti, config.at(iey).at(iex), "IoCtrl.REN_" + std::to_string(iez), false);
-                }
-            }
-        } else if (ctx->bel_to_cell[bel.index] == IdString() && ctx->getBelType(bel) == TYPE_ICESTORM_RAM) {
-            const BelInfoPOD &beli = ci.bel_data[bel.index];
-            int x = beli.x, y = beli.y;
-            const TileInfoPOD &ti = bi.tiles_nonrouting[TILE_RAMB];
-            if ((ctx->args.type == ArchArgs::LP1K || ctx->args.type == ArchArgs::HX1K)) {
-                set_config(ti, config.at(y).at(x), "RamConfig.PowerUp", true);
-            }
-        }
-    }
-
-    // Set other config bits
-    for (int y = 0; y < ci.height; y++) {
-        for (int x = 0; x < ci.width; x++) {
-            TileType tile = tile_at(ctx, x, y);
-            const TileInfoPOD &ti = bi.tiles_nonrouting[tile];
-
-            // set all ColBufCtrl bits (FIXME)
-            bool setColBufCtrl = true;
-            if (ctx->args.type == ArchArgs::LP1K || ctx->args.type == ArchArgs::HX1K) {
-                if (tile == TILE_RAMB || tile == TILE_RAMT) {
-                    setColBufCtrl = (y == 3 || y == 5 || y == 11 || y == 13);
-                } else {
-                    setColBufCtrl = (y == 4 || y == 5 || y == 12 || y == 13);
-                }
-            } else if (ctx->args.type == ArchArgs::LP8K || ctx->args.type == ArchArgs::HX8K) {
-                setColBufCtrl = (y == 8 || y == 9 || y == 24 || y == 25);
-            } else if (ctx->args.type == ArchArgs::UP5K) {
-                setColBufCtrl = (y == 4 || y == 5 || y == 14 || y == 15 || y == 26 || y == 27);
-            }
-            if (setColBufCtrl) {
-                set_config(ti, config.at(y).at(x), "ColBufCtrl.glb_netwk_0", true);
-                set_config(ti, config.at(y).at(x), "ColBufCtrl.glb_netwk_1", true);
-                set_config(ti, config.at(y).at(x), "ColBufCtrl.glb_netwk_2", true);
-                set_config(ti, config.at(y).at(x), "ColBufCtrl.glb_netwk_3", true);
-                set_config(ti, config.at(y).at(x), "ColBufCtrl.glb_netwk_4", true);
-                set_config(ti, config.at(y).at(x), "ColBufCtrl.glb_netwk_5", true);
-                set_config(ti, config.at(y).at(x), "ColBufCtrl.glb_netwk_6", true);
-                set_config(ti, config.at(y).at(x), "ColBufCtrl.glb_netwk_7", true);
-            }
-
-            // Weird UltraPlus bits
-            if (tile == TILE_DSP0 || tile == TILE_DSP1 || tile == TILE_DSP2 || tile == TILE_DSP3 ||
-                tile == TILE_IPCON) {
-                if (ctx->args.type == ArchArgs::UP5K && x == 25 && y == 14) {
-                    // Mystery bits not set in this one tile
-                } else {
-                    for (int lc_idx = 0; lc_idx < 8; lc_idx++) {
-                        static const std::vector<int> ip_dsp_lut_perm = {
-                                4, 14, 15, 5, 6, 16, 17, 7, 3, 13, 12, 2, 1, 11, 10, 0,
-                        };
-                        for (int i = 0; i < 16; i++)
-                            set_config(ti, config.at(y).at(x), "LC_" + std::to_string(lc_idx), ((i % 8) >= 4),
-                                       ip_dsp_lut_perm.at(i));
-                        if (tile == TILE_IPCON)
-                            set_config(ti, config.at(y).at(x),
-                                       "Cascade.IPCON_LC0" + std::to_string(lc_idx) + "_inmux02_5", true);
-                        else
-                            set_config(ti, config.at(y).at(x),
-                                       "Cascade.MULT" + std::to_string(int(tile - TILE_DSP0)) + "_LC0" +
-                                               std::to_string(lc_idx) + "_inmux02_5",
-                                       true);
-                    }
-                }
-            }
-        }
-    }
-
-    // Write config out
-    for (int y = 0; y < ci.height; y++) {
-        for (int x = 0; x < ci.width; x++) {
-            TileType tile = tile_at(ctx, x, y);
-            if (tile == TILE_NONE)
-                continue;
-            switch (tile) {
-            case TILE_LOGIC:
-                out << ".logic_tile";
-                break;
-            case TILE_IO:
-                out << ".io_tile";
-                break;
-            case TILE_RAMB:
-                out << ".ramb_tile";
-                break;
-            case TILE_RAMT:
-                out << ".ramt_tile";
-                break;
-            case TILE_DSP0:
-                out << ".dsp0_tile";
-                break;
-            case TILE_DSP1:
-                out << ".dsp1_tile";
-                break;
-            case TILE_DSP2:
-                out << ".dsp2_tile";
-                break;
-            case TILE_DSP3:
-                out << ".dsp3_tile";
-                break;
-            case TILE_IPCON:
-                out << ".ipcon_tile";
-                break;
-            default:
-                NPNR_ASSERT(false);
-            }
-            out << " " << x << " " << y << std::endl;
-            for (auto row : config.at(y).at(x)) {
-                for (auto col : row) {
-                    if (col == 1)
-                        out << "1";
-                    else
-                        out << "0";
-                }
-                out << std::endl;
-            }
-            out << std::endl;
-        }
-    }
-
-    // Write RAM init data
-    for (auto &cell : ctx->cells) {
-        if (cell.second->bel != BelId()) {
-            if (cell.second->type == ctx->id("ICESTORM_RAM")) {
-                const BelInfoPOD &beli = ci.bel_data[cell.second->bel.index];
-                int x = beli.x, y = beli.y;
-                out << ".ram_data " << x << " " << y << std::endl;
-                for (int w = 0; w < 16; w++) {
-                    std::vector<bool> bits(256);
-                    std::string init =
-                            get_param_str_or_def(cell.second.get(), ctx->id(std::string("INIT_") + get_hexdigit(w)));
-                    NPNR_ASSERT(init != "");
-                    for (size_t i = 0; i < init.size(); i++) {
-                        bool val = (init.at((init.size() - 1) - i) == '1');
-                        bits.at(i) = val;
-                    }
-                    for (int i = bits.size() - 4; i >= 0; i -= 4) {
-                        int c = bits.at(i) + (bits.at(i + 1) << 1) + (bits.at(i + 2) << 2) + (bits.at(i + 3) << 3);
-                        out << char(std::tolower(get_hexdigit(c)));
-                    }
-                    out << std::endl;
-                }
-                out << std::endl;
-            }
-        }
-    }
-
-    // Write symbols
-    // const bool write_symbols = 1;
-    for (auto wire : ctx->getWires()) {
-        IdString net = ctx->getBoundWireNet(wire);
-        if (net != IdString())
-            out << ".sym " << wire.index << " " << net.str(ctx) << std::endl;
-    }
-}
-
-NEXTPNR_NAMESPACE_END
+/*

+ *  nextpnr -- Next Generation Place and Route

+ *

+ *  Copyright (C) 2018  Clifford Wolf <clifford@symbioticeda.com>

+ *  Copyright (C) 2018  David Shah <david@symbioticeda.com>

+ *

+ *  Permission to use, copy, modify, and/or distribute this software for any

+ *  purpose with or without fee is hereby granted, provided that the above

+ *  copyright notice and this permission notice appear in all copies.

+ *

+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

+ *

+ */

+#include "bitstream.h"

+#include <cctype>

+#include <vector>

+#include "cells.h"

+#include "log.h"

+

+NEXTPNR_NAMESPACE_BEGIN

+

+inline TileType tile_at(const Context *ctx, int x, int y)

+{

+    return ctx->chip_info->tile_grid[y * ctx->chip_info->width + x];

+}

+

+const ConfigEntryPOD &find_config(const TileInfoPOD &tile, const std::string &name)

+{

+    for (int i = 0; i < tile.num_config_entries; i++) {

+        if (std::string(tile.entries[i].name.get()) == name) {

+            return tile.entries[i];

+        }

+    }

+    NPNR_ASSERT_FALSE_STR("unable to find config bit " + name);

+}

+

+std::tuple<int8_t, int8_t, int8_t> get_ieren(const BitstreamInfoPOD &bi, int8_t x, int8_t y, int8_t z)

+{

+    for (int i = 0; i < bi.num_ierens; i++) {

+        auto ie = bi.ierens[i];

+        if (ie.iox == x && ie.ioy == y && ie.ioz == z) {

+            return std::make_tuple(ie.ierx, ie.iery, ie.ierz);

+        }

+    }

+    // No pin at this location

+    return std::make_tuple(-1, -1, -1);

+};

+

+bool get_config(const TileInfoPOD &ti, std::vector<std::vector<int8_t>> &tile_cfg, const std::string &name,

+                int index = -1)

+{

+    const ConfigEntryPOD &cfg = find_config(ti, name);

+    if (index == -1) {

+        for (int i = 0; i < cfg.num_bits; i++) {

+            return tile_cfg.at(cfg.bits[i].row).at(cfg.bits[i].col);

+        }

+    } else {

+        return tile_cfg.at(cfg.bits[index].row).at(cfg.bits[index].col);

+    }

+    return false;

+}

+

+void set_config(const TileInfoPOD &ti, std::vector<std::vector<int8_t>> &tile_cfg, const std::string &name, bool value,

+                int index = -1)

+{

+    const ConfigEntryPOD &cfg = find_config(ti, name);

+    if (index == -1) {

+        for (int i = 0; i < cfg.num_bits; i++) {

+            int8_t &cbit = tile_cfg.at(cfg.bits[i].row).at(cfg.bits[i].col);

+            if (cbit && !value)

+                log_error("clearing already set config bit %s", name.c_str());

+            cbit = value;

+        }

+    } else {

+        int8_t &cbit = tile_cfg.at(cfg.bits[index].row).at(cfg.bits[index].col);

+        cbit = value;

+        if (cbit && !value)

+            log_error("clearing already set config bit %s[%d]", name.c_str(), index);

+    }

+}

+

+int get_param_or_def(const CellInfo *cell, const IdString param, int defval = 0)

+{

+    auto found = cell->params.find(param);

+    if (found != cell->params.end())

+        return std::stoi(found->second);

+    else

+        return defval;

+}

+

+std::string get_param_str_or_def(const CellInfo *cell, const IdString param, std::string defval = "")

+{

+    auto found = cell->params.find(param);

+    if (found != cell->params.end())

+        return found->second;

+    else

+        return defval;

+}

+

+char get_hexdigit(int i) { return std::string("0123456789ABCDEF").at(i); }

+

+static const BelConfigPOD &get_ec_config(const ChipInfoPOD *chip, BelId bel)

+{

+    for (int i = 0; i < chip->num_belcfgs; i++) {

+        if (chip->bel_config[i].bel_index == bel.index)

+            return chip->bel_config[i];

+    }

+    NPNR_ASSERT_FALSE("failed to find bel config");

+}

+

+typedef std::vector<std::vector<std::vector<std::vector<int8_t>>>> chipconfig_t;

+

+static void set_ec_cbit(chipconfig_t &config, const Context *ctx, const BelConfigPOD &cell_cbits, std::string name,

+                        bool value)

+{

+    const ChipInfoPOD *chip = ctx->chip_info;

+

+    for (int i = 0; i < cell_cbits.num_entries; i++) {

+        const auto &cbit = cell_cbits.entries[i];

+        if (cbit.entry_name.get() == name) {

+            const auto &ti = chip->bits_info->tiles_nonrouting[tile_at(ctx, cbit.x, cbit.y)];

+            set_config(ti, config.at(cbit.y).at(cbit.x), std::string("IpConfig.") + cbit.cbit_name.get(), value);

+            return;

+        }

+    }

+    NPNR_ASSERT_FALSE_STR("failed to config extra cell config bit " + name);

+}

+

+void configure_extra_cell(chipconfig_t &config, const Context *ctx, CellInfo *cell,

+                          const std::vector<std::pair<std::string, int>> &params, bool string_style)

+{

+    const ChipInfoPOD *chip = ctx->chip_info;

+    const auto &bc = get_ec_config(chip, cell->bel);

+    for (auto p : params) {

+        std::vector<bool> value;

+        if (string_style) {

+            // Lattice's weird string style params, not sure if

+            // prefixes other than 0b should be supported, only 0b features in docs

+            std::string raw = get_param_str_or_def(cell, ctx->id(p.first), "0b0");

+            assert(raw.substr(0, 2) == "0b");

+            raw = raw.substr(2);

+            value.resize(raw.length());

+            for (int i = 0; i < (int)raw.length(); i++) {

+                if (raw[i] == '1') {

+                    value[(raw.length() - 1) - i] = 1;

+                } else {

+                    assert(raw[i] == '0');

+                    value[(raw.length() - 1) - i] = 0;

+                }

+            }

+        } else {

+            int ival = get_param_or_def(cell, ctx->id(p.first), 0);

+

+            for (int i = 0; i < p.second; i++)

+                value.push_back((ival >> i) & 0x1);

+        }

+

+        value.resize(p.second);

+        if (p.second == 1) {

+            set_ec_cbit(config, ctx, bc, p.first, value.at(0));

+        } else {

+            for (int i = 0; i < p.second; i++) {

+                set_ec_cbit(config, ctx, bc, p.first + "_" + std::to_string(i), value.at(i));

+            }

+        }

+    }

+}

+

+std::string tagTileType(TileType &tile)

+{

+    if (tile == TILE_NONE)

+        return "";

+    switch (tile) {

+    case TILE_LOGIC:

+        return ".logic_tile";

+        break;

+    case TILE_IO:

+        return ".io_tile";

+        break;

+    case TILE_RAMB:

+        return ".ramb_tile";

+        break;

+    case TILE_RAMT:

+        return ".ramt_tile";

+        break;

+    case TILE_DSP0:

+        return ".dsp0_tile";

+        break;

+    case TILE_DSP1:

+        return ".dsp1_tile";

+        break;

+    case TILE_DSP2:

+        return ".dsp2_tile";

+        break;

+    case TILE_DSP3:

+        return ".dsp3_tile";

+        break;

+    case TILE_IPCON:

+        return ".ipcon_tile";

+        break;

+    default:

+        NPNR_ASSERT(false);

+    }

+}

+void write_asc(const Context *ctx, std::ostream &out)

+{

+    // [y][x][row][col]

+    const ChipInfoPOD &ci = *ctx->chip_info;

+    const BitstreamInfoPOD &bi = *ci.bits_info;

+    chipconfig_t config;

+    config.resize(ci.height);

+    for (int y = 0; y < ci.height; y++) {

+        config.at(y).resize(ci.width);

+        for (int x = 0; x < ci.width; x++) {

+            TileType tile = tile_at(ctx, x, y);

+            int rows = bi.tiles_nonrouting[tile].rows;

+            int cols = bi.tiles_nonrouting[tile].cols;

+            config.at(y).at(x).resize(rows, std::vector<int8_t>(cols));

+        }

+    }

+    out << ".comment from next-pnr" << std::endl;

+

+    switch (ctx->args.type) {

+    case ArchArgs::LP384:

+        out << ".device 384" << std::endl;

+        break;

+    case ArchArgs::HX1K:

+    case ArchArgs::LP1K:

+        out << ".device 1k" << std::endl;

+        break;

+    case ArchArgs::HX8K:

+    case ArchArgs::LP8K:

+        out << ".device 8k" << std::endl;

+        break;

+    case ArchArgs::UP5K:

+        out << ".device 5k" << std::endl;

+        break;

+    default:

+        NPNR_ASSERT_FALSE("unsupported device type\n");

+    }

+    // Set pips

+    for (auto pip : ctx->getPips()) {

+        if (ctx->pip_to_net[pip.index] != IdString()) {

+            const PipInfoPOD &pi = ci.pip_data[pip.index];

+            const SwitchInfoPOD &swi = bi.switches[pi.switch_index];

+            for (int i = 0; i < swi.num_bits; i++) {

+                bool val = (pi.switch_mask & (1 << ((swi.num_bits - 1) - i))) != 0;

+                int8_t &cbit = config.at(swi.y).at(swi.x).at(swi.cbits[i].row).at(swi.cbits[i].col);

+                if (bool(cbit) != 0)

+                    NPNR_ASSERT(false);

+                cbit = val;

+            }

+        }

+    }

+    // Set logic cell config

+    for (auto &cell : ctx->cells) {

+        BelId bel = cell.second.get()->bel;

+        if (bel == BelId()) {

+            std::cout << "Found unplaced cell " << cell.first.str(ctx) << " while generating bitstream!" << std::endl;

+            continue;

+        }

+        if (cell.second->type == ctx->id("ICESTORM_LC")) {

+            const BelInfoPOD &beli = ci.bel_data[bel.index];

+            int x = beli.x, y = beli.y, z = beli.z;

+            const TileInfoPOD &ti = bi.tiles_nonrouting[TILE_LOGIC];

+            unsigned lut_init = get_param_or_def(cell.second.get(), ctx->id("LUT_INIT"));

+            bool neg_clk = get_param_or_def(cell.second.get(), ctx->id("NEG_CLK"));

+            bool dff_enable = get_param_or_def(cell.second.get(), ctx->id("DFF_ENABLE"));

+            bool async_sr = get_param_or_def(cell.second.get(), ctx->id("ASYNC_SR"));

+            bool set_noreset = get_param_or_def(cell.second.get(), ctx->id("SET_NORESET"));

+            bool carry_enable = get_param_or_def(cell.second.get(), ctx->id("CARRY_ENABLE"));

+            std::vector<bool> lc(20, false);

+            // From arachne-pnr

+            static std::vector<int> lut_perm = {

+                    4, 14, 15, 5, 6, 16, 17, 7, 3, 13, 12, 2, 1, 11, 10, 0,

+            };

+            for (int i = 0; i < 16; i++) {

+                if ((lut_init >> i) & 0x1)

+                    lc.at(lut_perm.at(i)) = true;

+            }

+            lc.at(8) = carry_enable;

+            lc.at(9) = dff_enable;

+            lc.at(18) = set_noreset;

+            lc.at(19) = async_sr;

+

+            for (int i = 0; i < 20; i++)

+                set_config(ti, config.at(y).at(x), "LC_" + std::to_string(z), lc.at(i), i);

+            if (dff_enable)

+                set_config(ti, config.at(y).at(x), "NegClk", neg_clk);

+

+            bool carry_const = get_param_or_def(cell.second.get(), ctx->id("CIN_CONST"));

+            bool carry_set = get_param_or_def(cell.second.get(), ctx->id("CIN_SET"));

+            if (carry_const) {

+                if (!ctx->force)

+                    NPNR_ASSERT(z == 0);

+                set_config(ti, config.at(y).at(x), "CarryInSet", carry_set);

+            }

+        } else if (cell.second->type == ctx->id("SB_IO")) {

+            const BelInfoPOD &beli = ci.bel_data[bel.index];

+            int x = beli.x, y = beli.y, z = beli.z;

+            const TileInfoPOD &ti = bi.tiles_nonrouting[TILE_IO];

+            unsigned pin_type = get_param_or_def(cell.second.get(), ctx->id("PIN_TYPE"));

+            bool neg_trigger = get_param_or_def(cell.second.get(), ctx->id("NEG_TRIGGER"));

+            bool pullup = get_param_or_def(cell.second.get(), ctx->id("PULLUP"));

+            for (int i = 0; i < 6; i++) {

+                bool val = (pin_type >> i) & 0x01;

+                set_config(ti, config.at(y).at(x), "IOB_" + std::to_string(z) + ".PINTYPE_" + std::to_string(i), val);

+            }

+            set_config(ti, config.at(y).at(x), "NegClk", neg_trigger);

+            auto ieren = get_ieren(bi, x, y, z);

+            int iex, iey, iez;

+            std::tie(iex, iey, iez) = ieren;

+            NPNR_ASSERT(iez != -1);

+

+            bool input_en = false;

+            if ((ctx->wire_to_net[ctx->getWireBelPin(bel, PIN_D_IN_0).index] != IdString()) ||

+                (ctx->wire_to_net[ctx->getWireBelPin(bel, PIN_D_IN_1).index] != IdString())) {

+                input_en = true;

+            }

+

+            if (ctx->args.type == ArchArgs::LP1K || ctx->args.type == ArchArgs::HX1K) {

+                set_config(ti, config.at(iey).at(iex), "IoCtrl.IE_" + std::to_string(iez), !input_en);

+                set_config(ti, config.at(iey).at(iex), "IoCtrl.REN_" + std::to_string(iez), !pullup);

+            } else {

+                set_config(ti, config.at(iey).at(iex), "IoCtrl.IE_" + std::to_string(iez), input_en);

+                set_config(ti, config.at(iey).at(iex), "IoCtrl.REN_" + std::to_string(iez), !pullup);

+            }

+

+            if (ctx->args.type == ArchArgs::UP5K) {

+                if (iez == 0) {

+                    set_config(ti, config.at(iey).at(iex), "IoCtrl.cf_bit_39", !pullup);

+                } else if (iez == 1) {

+                    set_config(ti, config.at(iey).at(iex), "IoCtrl.cf_bit_35", !pullup);

+                }

+            }

+        } else if (cell.second->type == ctx->id("SB_GB")) {

+            // no cell config bits

+        } else if (cell.second->type == ctx->id("ICESTORM_RAM")) {

+            const BelInfoPOD &beli = ci.bel_data[bel.index];

+            int x = beli.x, y = beli.y;

+            const TileInfoPOD &ti_ramt = bi.tiles_nonrouting[TILE_RAMT];

+            const TileInfoPOD &ti_ramb = bi.tiles_nonrouting[TILE_RAMB];

+            if (!(ctx->args.type == ArchArgs::LP1K || ctx->args.type == ArchArgs::HX1K)) {

+                set_config(ti_ramb, config.at(y).at(x), "RamConfig.PowerUp", true);

+            }

+            bool negclk_r = get_param_or_def(cell.second.get(), ctx->id("NEG_CLK_R"));

+            bool negclk_w = get_param_or_def(cell.second.get(), ctx->id("NEG_CLK_W"));

+            int write_mode = get_param_or_def(cell.second.get(), ctx->id("WRITE_MODE"));

+            int read_mode = get_param_or_def(cell.second.get(), ctx->id("READ_MODE"));

+            set_config(ti_ramb, config.at(y).at(x), "NegClk", negclk_w);

+            set_config(ti_ramt, config.at(y + 1).at(x), "NegClk", negclk_r);

+

+            set_config(ti_ramt, config.at(y + 1).at(x), "RamConfig.CBIT_0", write_mode & 0x1);

+            set_config(ti_ramt, config.at(y + 1).at(x), "RamConfig.CBIT_1", write_mode & 0x2);

+            set_config(ti_ramt, config.at(y + 1).at(x), "RamConfig.CBIT_2", read_mode & 0x1);

+            set_config(ti_ramt, config.at(y + 1).at(x), "RamConfig.CBIT_3", read_mode & 0x2);

+        } else if (cell.second->type == ctx->id("SB_WARMBOOT") || cell.second->type == ctx->id("ICESTORM_LFOSC")) {

+            // No config needed

+        } else if (cell.second->type == ctx->id("ICESTORM_SPRAM")) {

+            const BelInfoPOD &beli = ci.bel_data[bel.index];

+            int x = beli.x, y = beli.y, z = beli.z;

+            NPNR_ASSERT(ctx->args.type == ArchArgs::UP5K);

+            if (x == 0 && y == 0) {

+                const TileInfoPOD &ti_ipcon = bi.tiles_nonrouting[TILE_IPCON];

+                if (z == 1) {

+                    set_config(ti_ipcon, config.at(1).at(0), "IpConfig.CBIT_0", true);

+                } else if (z == 2) {

+                    set_config(ti_ipcon, config.at(1).at(0), "IpConfig.CBIT_1", true);

+                } else {

+                    NPNR_ASSERT(false);

+                }

+            } else if (x == 25 && y == 0) {

+                const TileInfoPOD &ti_ipcon = bi.tiles_nonrouting[TILE_IPCON];

+                if (z == 3) {

+                    set_config(ti_ipcon, config.at(1).at(25), "IpConfig.CBIT_0", true);

+                } else if (z == 4) {

+                    set_config(ti_ipcon, config.at(1).at(25), "IpConfig.CBIT_1", true);

+                } else {

+                    NPNR_ASSERT(false);

+                }

+            }

+        } else if (cell.second->type == ctx->id("ICESTORM_DSP")) {

+            const std::vector<std::pair<std::string, int>> mac16_params = {{"C_REG", 1},

+                                                                           {"A_REG", 1},

+                                                                           {"B_REG", 1},

+                                                                           {"D_REG", 1},

+                                                                           {"TOP_8x8_MULT_REG", 1},

+                                                                           {"BOT_8x8_MULT_REG", 1},

+                                                                           {"PIPELINE_16x16_MULT_REG1", 1},

+                                                                           {"PIPELINE_16x16_MULT_REG2", 1},

+                                                                           {"TOPOUTPUT_SELECT", 2},

+                                                                           {"TOPADDSUB_LOWERINPUT", 2},

+                                                                           {"TOPADDSUB_UPPERINPUT", 1},

+                                                                           {"TOPADDSUB_CARRYSELECT", 2},

+                                                                           {"BOTOUTPUT_SELECT", 2},

+                                                                           {"BOTADDSUB_LOWERINPUT", 2},

+                                                                           {"BOTADDSUB_UPPERINPUT", 1},

+                                                                           {"BOTADDSUB_CARRYSELECT", 2},

+                                                                           {"MODE_8x8", 1},

+                                                                           {"A_SIGNED", 1},

+                                                                           {"B_SIGNED", 1}};

+            configure_extra_cell(config, ctx, cell.second.get(), mac16_params, false);

+        } else {

+            NPNR_ASSERT(false);

+        }

+    }

+    // Set config bits in unused IO and RAM

+    for (auto bel : ctx->getBels()) {

+        if (ctx->bel_to_cell[bel.index] == IdString() && ctx->getBelType(bel) == TYPE_SB_IO) {

+            const TileInfoPOD &ti = bi.tiles_nonrouting[TILE_IO];

+            const BelInfoPOD &beli = ci.bel_data[bel.index];

+            int x = beli.x, y = beli.y, z = beli.z;

+            auto ieren = get_ieren(bi, x, y, z);

+            int iex, iey, iez;

+            std::tie(iex, iey, iez) = ieren;

+            if (iez != -1) {

+                if (ctx->args.type == ArchArgs::LP1K || ctx->args.type == ArchArgs::HX1K) {

+                    set_config(ti, config.at(iey).at(iex), "IoCtrl.IE_" + std::to_string(iez), true);

+                    set_config(ti, config.at(iey).at(iex), "IoCtrl.REN_" + std::to_string(iez), false);

+                }

+            }

+        } else if (ctx->bel_to_cell[bel.index] == IdString() && ctx->getBelType(bel) == TYPE_ICESTORM_RAM) {

+            const BelInfoPOD &beli = ci.bel_data[bel.index];

+            int x = beli.x, y = beli.y;

+            const TileInfoPOD &ti = bi.tiles_nonrouting[TILE_RAMB];

+            if ((ctx->args.type == ArchArgs::LP1K || ctx->args.type == ArchArgs::HX1K)) {

+                set_config(ti, config.at(y).at(x), "RamConfig.PowerUp", true);

+            }

+        }

+    }

+

+    // Set other config bits

+    for (int y = 0; y < ci.height; y++) {

+        for (int x = 0; x < ci.width; x++) {

+            TileType tile = tile_at(ctx, x, y);

+            const TileInfoPOD &ti = bi.tiles_nonrouting[tile];

+

+            // set all ColBufCtrl bits (FIXME)

+            bool setColBufCtrl = true;

+            if (ctx->args.type == ArchArgs::LP1K || ctx->args.type == ArchArgs::HX1K) {

+                if (tile == TILE_RAMB || tile == TILE_RAMT) {

+                    setColBufCtrl = (y == 3 || y == 5 || y == 11 || y == 13);

+                } else {

+                    setColBufCtrl = (y == 4 || y == 5 || y == 12 || y == 13);

+                }

+            } else if (ctx->args.type == ArchArgs::LP8K || ctx->args.type == ArchArgs::HX8K) {

+                setColBufCtrl = (y == 8 || y == 9 || y == 24 || y == 25);

+            } else if (ctx->args.type == ArchArgs::UP5K) {

+                setColBufCtrl = (y == 4 || y == 5 || y == 14 || y == 15 || y == 26 || y == 27);

+            }

+            if (setColBufCtrl) {

+                set_config(ti, config.at(y).at(x), "ColBufCtrl.glb_netwk_0", true);

+                set_config(ti, config.at(y).at(x), "ColBufCtrl.glb_netwk_1", true);

+                set_config(ti, config.at(y).at(x), "ColBufCtrl.glb_netwk_2", true);

+                set_config(ti, config.at(y).at(x), "ColBufCtrl.glb_netwk_3", true);

+                set_config(ti, config.at(y).at(x), "ColBufCtrl.glb_netwk_4", true);

+                set_config(ti, config.at(y).at(x), "ColBufCtrl.glb_netwk_5", true);

+                set_config(ti, config.at(y).at(x), "ColBufCtrl.glb_netwk_6", true);

+                set_config(ti, config.at(y).at(x), "ColBufCtrl.glb_netwk_7", true);

+            }

+

+            // Weird UltraPlus bits

+            if (tile == TILE_DSP0 || tile == TILE_DSP1 || tile == TILE_DSP2 || tile == TILE_DSP3 ||

+                tile == TILE_IPCON) {

+                if (ctx->args.type == ArchArgs::UP5K && x == 25 && y == 14) {

+                    // Mystery bits not set in this one tile

+                } else {

+                    for (int lc_idx = 0; lc_idx < 8; lc_idx++) {

+                        static const std::vector<int> ip_dsp_lut_perm = {

+                                4, 14, 15, 5, 6, 16, 17, 7, 3, 13, 12, 2, 1, 11, 10, 0,

+                        };

+                        for (int i = 0; i < 16; i++)

+                            set_config(ti, config.at(y).at(x), "LC_" + std::to_string(lc_idx), ((i % 8) >= 4),

+                                       ip_dsp_lut_perm.at(i));

+                        if (tile == TILE_IPCON)

+                            set_config(ti, config.at(y).at(x),

+                                       "Cascade.IPCON_LC0" + std::to_string(lc_idx) + "_inmux02_5", true);

+                        else

+                            set_config(ti, config.at(y).at(x), "Cascade.MULT" + std::to_string(int(tile - TILE_DSP0)) +

+                                                                       "_LC0" + std::to_string(lc_idx) + "_inmux02_5",

+                                       true);

+                    }

+                }

+            }

+        }

+    }

+

+    // Write config out

+    for (int y = 0; y < ci.height; y++) {

+        for (int x = 0; x < ci.width; x++) {

+            TileType tile = tile_at(ctx, x, y);

+            if (tile == TILE_NONE)

+                continue;

+            out << tagTileType(tile);

+            out << " " << x << " " << y << std::endl;

+            for (auto row : config.at(y).at(x)) {

+                for (auto col : row) {

+                    if (col == 1)

+                        out << "1";

+                    else

+                        out << "0";

+                }

+                out << std::endl;

+            }

+            out << std::endl;

+        }

+    }

+

+    // Write RAM init data

+    for (auto &cell : ctx->cells) {

+        if (cell.second->bel != BelId()) {

+            if (cell.second->type == ctx->id("ICESTORM_RAM")) {

+                const BelInfoPOD &beli = ci.bel_data[cell.second->bel.index];

+                int x = beli.x, y = beli.y;

+                out << ".ram_data " << x << " " << y << std::endl;

+                for (int w = 0; w < 16; w++) {

+                    std::vector<bool> bits(256);

+                    std::string init =

+                            get_param_str_or_def(cell.second.get(), ctx->id(std::string("INIT_") + get_hexdigit(w)));

+                    NPNR_ASSERT(init != "");

+                    for (size_t i = 0; i < init.size(); i++) {

+                        bool val = (init.at((init.size() - 1) - i) == '1');

+                        bits.at(i) = val;

+                    }

+                    for (int i = bits.size() - 4; i >= 0; i -= 4) {

+                        int c = bits.at(i) + (bits.at(i + 1) << 1) + (bits.at(i + 2) << 2) + (bits.at(i + 3) << 3);

+                        out << char(std::tolower(get_hexdigit(c)));

+                    }

+                    out << std::endl;

+                }

+                out << std::endl;

+            }

+        }

+    }

+

+    // Write symbols

+    // const bool write_symbols = 1;

+    for (auto wire : ctx->getWires()) {

+        IdString net = ctx->getBoundWireNet(wire);

+        if (net != IdString())

+            out << ".sym " << wire.index << " " << net.str(ctx) << std::endl;

+    }

+}

+

+void read_config(Context *ctx, std::istream &in, chipconfig_t &config)

+{

+    constexpr size_t line_buf_size = 65536;

+    char buffer[line_buf_size];

+    int tile_x = -1, tile_y = -1, line_nr = -1;

+

+    while (1) {

+        in.getline(buffer, line_buf_size);

+        if (buffer[0] == '.') {

+            line_nr = -1;

+            const char *tok = strtok(buffer, " \t\r\n");

+

+            if (!strcmp(tok, ".device")) {

+                std::string config_device = strtok(nullptr, " \t\r\n");

+                std::string expected;

+                switch (ctx->args.type) {

+                case ArchArgs::LP384:

+                    expected = "384";

+                    break;

+                case ArchArgs::HX1K:

+                case ArchArgs::LP1K:

+                    expected = "1k";

+                    break;

+                case ArchArgs::HX8K:

+                case ArchArgs::LP8K:

+                    expected = "8k";

+                    break;

+                case ArchArgs::UP5K:

+                    expected = "5k";

+                    break;

+                default:

+                    log_error("unsupported device type\n");

+                }

+                if (expected != config_device)

+                    log_error("device type does not match\n");

+            } else if (!strcmp(tok, ".io_tile") || !strcmp(tok, ".logic_tile") || !strcmp(tok, ".ramb_tile") ||

+                       !strcmp(tok, ".ramt_tile") || !strcmp(tok, ".ipcon_tile") || !strcmp(tok, ".dsp0_tile") ||

+                       !strcmp(tok, ".dsp1_tile") || !strcmp(tok, ".dsp2_tile") || !strcmp(tok, ".dsp3_tile")) {

+                line_nr = 0;

+                tile_x = atoi(strtok(nullptr, " \t\r\n"));

+                tile_y = atoi(strtok(nullptr, " \t\r\n"));

+

+                TileType tile = tile_at(ctx, tile_x, tile_y);

+                if (tok != tagTileType(tile))

+                    log_error("Wrong tile type for specified position\n");

+

+            } else if (!strcmp(tok, ".extra_bit")) {

+                /*

+                int b = atoi(strtok(nullptr, " \t\r\n"));

+                int x = atoi(strtok(nullptr, " \t\r\n"));

+                int y = atoi(strtok(nullptr, " \t\r\n"));

+                std::tuple<int, int, int> key(b, x, y);

+                extra_bits.insert(key);

+                */

+            } else if (!strcmp(tok, ".sym")) {

+                int wireIndex = atoi(strtok(nullptr, " \t\r\n"));

+                const char *name = strtok(nullptr, " \t\r\n");

+

+                IdString netName = ctx->id(name);

+

+                if (ctx->nets.find(netName) == ctx->nets.end()) {

+                    std::unique_ptr<NetInfo> created_net = std::unique_ptr<NetInfo>(new NetInfo);

+                    created_net->name = netName;

+                    ctx->nets[netName] = std::move(created_net);

+                }

+

+                WireId wire;

+                wire.index = wireIndex;

+                ctx->bindWire(wire, netName, STRENGTH_WEAK);

+            }

+        } else if (line_nr >= 0 && strlen(buffer) > 0) {

+            if (line_nr > int(config.at(tile_y).at(tile_x).size() - 1))

+                log_error("Invalid data in input asc file");

+            for (int i = 0; buffer[i] == '0' || buffer[i] == '1'; i++)

+                config.at(tile_y).at(tile_x).at(line_nr).at(i) = (buffer[i] == '1') ? 1 : 0;

+            line_nr++;

+        }

+        if (in.eof())

+            break;

+    }

+}

+

+bool read_asc(Context *ctx, std::istream &in)

+{

+    try {

+        // [y][x][row][col]

+        const ChipInfoPOD &ci = *ctx->chip_info;

+        const BitstreamInfoPOD &bi = *ci.bits_info;

+        chipconfig_t config;

+        config.resize(ci.height);

+        for (int y = 0; y < ci.height; y++) {

+            config.at(y).resize(ci.width);

+            for (int x = 0; x < ci.width; x++) {

+                TileType tile = tile_at(ctx, x, y);

+                int rows = bi.tiles_nonrouting[tile].rows;

+                int cols = bi.tiles_nonrouting[tile].cols;

+                config.at(y).at(x).resize(rows, std::vector<int8_t>(cols));

+            }

+        }

+        read_config(ctx, in, config);

+

+        // Set pips

+        for (auto pip : ctx->getPips()) {

+            const PipInfoPOD &pi = ci.pip_data[pip.index];

+            const SwitchInfoPOD &swi = bi.switches[pi.switch_index];

+            bool isUsed = true;

+            for (int i = 0; i < swi.num_bits; i++) {

+                bool val = (pi.switch_mask & (1 << ((swi.num_bits - 1) - i))) != 0;

+                int8_t cbit = config.at(swi.y).at(swi.x).at(swi.cbits[i].row).at(swi.cbits[i].col);

+                isUsed &= !(bool(cbit) ^ val);

+            }

+            if (isUsed) {

+                IdString net = ctx->wire_to_net[pi.dst];

+                WireId wire;

+                wire.index = pi.dst;

+                ctx->unbindWire(wire);

+                ctx->bindPip(pip, net, STRENGTH_WEAK);

+            }

+        }

+        for (auto bel : ctx->getBels()) {

+            if (ctx->getBelType(bel) == TYPE_ICESTORM_LC) {

+                const TileInfoPOD &ti = bi.tiles_nonrouting[TILE_LOGIC];

+                const BelInfoPOD &beli = ci.bel_data[bel.index];

+                int x = beli.x, y = beli.y, z = beli.z;

+                std::vector<bool> lc(20, false);

+                bool isUsed = false;

+                for (int i = 0; i < 20; i++) {

+                    lc.at(i) = get_config(ti, config.at(y).at(x), "LC_" + std::to_string(z), i);

+                    isUsed |= lc.at(i);

+                }

+                bool neg_clk = get_config(ti, config.at(y).at(x), "NegClk");

+                isUsed |= neg_clk;

+                bool carry_set = get_config(ti, config.at(y).at(x), "CarryInSet");

+                isUsed |= carry_set;

+

+                if (isUsed) {

+                    std::unique_ptr<CellInfo> created = create_ice_cell(ctx, ctx->id("ICESTORM_LC"));

+                    IdString name = created->name;

+                    ctx->cells[name] = std::move(created);

+                    ctx->bindBel(bel, name, STRENGTH_WEAK);

+                    // TODO: Add port mapping to nets and assign values of properties

+                }

+            }

+            if (ctx->getBelType(bel) == TYPE_SB_IO) {

+                const TileInfoPOD &ti = bi.tiles_nonrouting[TILE_IO];

+                const BelInfoPOD &beli = ci.bel_data[bel.index];

+                int x = beli.x, y = beli.y, z = beli.z;

+                bool isUsed = false;

+                for (int i = 0; i < 6; i++) {

+                    isUsed |= get_config(ti, config.at(y).at(x),

+                                         "IOB_" + std::to_string(z) + ".PINTYPE_" + std::to_string(i));

+                }

+                bool neg_trigger = get_config(ti, config.at(y).at(x), "NegClk");

+                isUsed |= neg_trigger;

+

+                if (isUsed) {

+                    std::unique_ptr<CellInfo> created = create_ice_cell(ctx, ctx->id("SB_IO"));

+                    IdString name = created->name;

+                    ctx->cells[name] = std::move(created);

+                    ctx->bindBel(bel, name, STRENGTH_WEAK);

+                    // TODO: Add port mapping to nets and assign values of properties

+                }

+            }

+        }

+        // Add cells that are without change in initial state of configuration

+        for (auto &net : ctx->nets) {

+            for (auto w : net.second->wires) {

+                if (w.second.pip == PipId()) {

+                    WireId wire = w.first;

+                    BelPin belpin = ctx->getBelPinUphill(wire);

+                    if (ctx->checkBelAvail(belpin.bel)) {

+                        if (ctx->getBelType(belpin.bel) == TYPE_ICESTORM_LC) {

+                            std::unique_ptr<CellInfo> created = create_ice_cell(ctx, ctx->id("ICESTORM_LC"));

+                            IdString name = created->name;

+                            ctx->cells[name] = std::move(created);

+                            ctx->bindBel(belpin.bel, name, STRENGTH_WEAK);

+                            // TODO: Add port mapping to nets

+                        }

+                        if (ctx->getBelType(belpin.bel) == TYPE_SB_IO) {

+                            std::unique_ptr<CellInfo> created = create_ice_cell(ctx, ctx->id("SB_IO"));

+                            IdString name = created->name;

+                            ctx->cells[name] = std::move(created);

+                            ctx->bindBel(belpin.bel, name, STRENGTH_WEAK);

+                            // TODO: Add port mapping to nets

+                        }

+                        if (ctx->getBelType(belpin.bel) == TYPE_SB_GB) {

+                            std::unique_ptr<CellInfo> created = create_ice_cell(ctx, ctx->id("SB_GB"));

+                            IdString name = created->name;

+                            ctx->cells[name] = std::move(created);

+                            ctx->bindBel(belpin.bel, name, STRENGTH_WEAK);

+                            // TODO: Add port mapping to nets

+                        }

+                        if (ctx->getBelType(belpin.bel) == TYPE_SB_WARMBOOT) {

+                            std::unique_ptr<CellInfo> created = create_ice_cell(ctx, ctx->id("SB_WARMBOOT"));

+                            IdString name = created->name;

+                            ctx->cells[name] = std::move(created);

+                            ctx->bindBel(belpin.bel, name, STRENGTH_WEAK);

+                            // TODO: Add port mapping to nets

+                        }

+                        if (ctx->getBelType(belpin.bel) == TYPE_ICESTORM_LFOSC) {

+                            std::unique_ptr<CellInfo> created = create_ice_cell(ctx, ctx->id("ICESTORM_LFOSC"));

+                            IdString name = created->name;

+                            ctx->cells[name] = std::move(created);

+                            ctx->bindBel(belpin.bel, name, STRENGTH_WEAK);

+                            // TODO: Add port mapping to nets

+                        }

+                    }

+                }

+            }

+        }

+        for (auto &cell : ctx->cells) {

+            if (cell.second->bel != BelId()) {

+                for (auto &port : cell.second->ports) {

+                    PortPin pin = ctx->portPinFromId(port.first);

+                    WireId wire = ctx->getWireBelPin(cell.second->bel, pin);

+                    if (wire != WireId()) {

+                        IdString name = ctx->getBoundWireNet(wire);

+                        if (name != IdString()) {

+                            port.second.net = ctx->nets[name].get();

+                            PortRef ref;

+                            ref.cell = cell.second.get();

+                            ref.port = port.second.name;

+

+                            if (port.second.type == PORT_OUT)

+                                ctx->nets[name]->driver = ref;

+                            else

+                                ctx->nets[name]->users.push_back(ref);

+                        }

+                    }

+                }

+            }

+        }

+        return true;

+    } catch (log_execution_error_exception) {

+        return false;

+    }

+}

+NEXTPNR_NAMESPACE_END

diff --git a/ice40/bitstream.h b/ice40/bitstream.h
index 2b6cda1d..41a2ae68 100644
--- a/ice40/bitstream.h
+++ b/ice40/bitstream.h
@@ -27,6 +27,7 @@
 NEXTPNR_NAMESPACE_BEGIN
 
 void write_asc(const Context *ctx, std::ostream &out);
+bool read_asc(Context *ctx, std::istream &in);
 
 NEXTPNR_NAMESPACE_END
 
diff --git a/ice40/blinky.proj b/ice40/blinky.proj
index 6789a27a..f5bb9f88 100644
--- a/ice40/blinky.proj
+++ b/ice40/blinky.proj
@@ -10,9 +10,6 @@
         "input": {
             "json": "blinky.json",
             "pcf": "blinky.pcf"
-        },
-        "params": {
-            "freq": "50"
         }
     }
 }
diff --git a/ice40/main.cc b/ice40/main.cc
index e77bdd34..70324a91 100644
--- a/ice40/main.cc
+++ b/ice40/main.cc
@@ -66,6 +66,14 @@ void svg_dump_decal(const Context *ctx, const DecalXY &decal)
     }
 }
 
+void conflicting_options(const boost::program_options::variables_map &vm, const char *opt1, const char *opt2)
+{
+    if (vm.count(opt1) && !vm[opt1].defaulted() && vm.count(opt2) && !vm[opt2].defaulted()) {
+        std::string msg = "Conflicting options '"+ std::string(opt1) + "' and '" + std::string(opt1) + "'.";
+        log_error("%s\n",msg.c_str());
+    }
+}
+
 int main(int argc, char *argv[])
 {
     try {
@@ -95,6 +103,7 @@ int main(int argc, char *argv[])
         options.add_options()("json", po::value<std::string>(), "JSON design file to ingest");
         options.add_options()("pcf", po::value<std::string>(), "PCF constraints file to ingest");
         options.add_options()("asc", po::value<std::string>(), "asc bitstream file to write");
+        options.add_options()("read", po::value<std::string>(), "asc bitstream file to read");
         options.add_options()("seed", po::value<int>(), "seed value for random number generator");
         options.add_options()("version,V", "show version");
         options.add_options()("tmfuzz", "run path delay estimate fuzzer");
@@ -121,13 +130,17 @@ int main(int argc, char *argv[])
             po::store(parsed, vm);
 
             po::notify(vm);
-        }
-
-        catch (std::exception &e) {
+        } catch (std::exception &e) {
             std::cout << e.what() << "\n";
             return 1;
         }
 
+        conflicting_options(vm, "read", "json");
+#ifndef ICE40_HX1K_ONLY
+        if ((vm.count("lp384") + vm.count("lp1k") + vm.count("lp8k") + vm.count("hx1k") + vm.count("hx8k") +
+             vm.count("up5k")) > 1)
+            log_error("Only one device type can be set\n");
+#endif
         if (vm.count("help") || argc == 1) {
         help:
             std::cout << boost::filesystem::basename(argv[0])
@@ -353,6 +366,13 @@ int main(int argc, char *argv[])
         if (vm.count("no-tmdriv"))
             ctx->timing_driven = false;
 
+        if (vm.count("read")) {
+            std::string filename = vm["read"].as<std::string>();
+            std::ifstream f(filename);
+            if (!read_asc(ctx.get(), f))
+                log_error("Loading ASC failed.\n");
+        }
+
 #ifndef NO_GUI
         if (vm.count("gui")) {
             Application a(argc, argv);
diff --git a/ice40/picorv32.proj b/ice40/picorv32.proj
new file mode 100644
index 00000000..a8c83bd9
--- /dev/null
+++ b/ice40/picorv32.proj
@@ -0,0 +1,15 @@
+{
+    "project": {
+        "version": "1",
+        "name": "picorv32",
+        "arch": {
+            "name": "ice40",
+            "type": "hx8k",
+            "package": "ct256"
+        },
+        "input": {
+            "json": "picorv32.json",
+            "pcf": "icebreaker.pcf"
+        }
+    }
+}
diff --git a/ice40/picorv32.sh b/ice40/picorv32.sh
index 87426cde..d06786c5 100755
--- a/ice40/picorv32.sh
+++ b/ice40/picorv32.sh
@@ -4,3 +4,4 @@ rm -f picorv32.v
 wget https://raw.githubusercontent.com/cliffordwolf/picorv32/master/picorv32.v
 yosys -p 'synth_ice40 -json picorv32.json -top top' picorv32.v picorv32_top.v
 ../nextpnr-ice40 --hx8k --asc picorv32.asc --json picorv32.json
+icetime -d hx8k -t picorv32.asc