Update README's with latest instructions and features.

Signed-off-by: Keith Rothman <537074+litghost@users.noreply.github.com>

1 files changed, 40 insertions, 0 deletions

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+## Makefile-driven BBA creation
+
+This Makefile will generate a Xilinx A35 chipdb if java, capnproto and
+capnproto-java are installed.
+
+### Installing dependencies
+
+Install java and javac if not already installed:
+```
+# Or equivalent for your local system.
+sudo apt-get install openjdk-10-jdk
+```
+
+Install capnproto if not already installed:
+```
+# Or equivalent for your local system.
+sudo apt-get install capnproto libcapnp-dev
+```
+
+Install capnproto-java if not already installed:
+```
+git clone https://github.com/capnproto/capnproto-java.git
+cd capnproto-java
+make
+sudo make install
+```
+
+### Instructions
+
+Once dependencies are installed, just run "make".  This should download
+remaining dependencies and build the chipdb and build nextpnr if not built.
+
+#### Re-building the chipdb
+
+```
+# Remove the text BBA
+rm build/nextpnr/fpga_interchange/chipdb.bba
+# Build the BBA
+make
+```