arc770: Introduce images for SD-cards

Historically on ARC we started from initramfs-based images because:
 a) It was much easier to debug especially when toolchain and other
    components were changing quite dynamically
 b) It was our usual approach for embedded Linux

But now with ARC port of Lede/OpenWRT getting more stable and mature
we're ready for more real-life scenarios with FS permanently stored
on SD-card. This essentially benefits from ability to setup devices
that survive reboots with all settings and extra packages kept in place.

Still we keep an ability to build images with initramfs.
This allows us to use storage-less simulators for testing still.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: John Crispin <john@phrozen.org>
Cc: Jo-Philipp Wich <jo@mein.io>

4 files changed, 101 insertions, 26 deletions

diff --git a/target/linux/arc770/image/Config.in b/target/linux/arc770/image/Config.in
new file mode 100644
index 0000000000..52f68ba241
--- /dev/null
+++ b/target/linux/arc770/image/Config.in
@@ -0,0 +1,5 @@
+config AXS10X_SD_BOOT_PARTSIZE
+	int "Boot (SD Card) filesystem partition size (in MB)"
+	depends on TARGET_arc770
+	default 20
+
diff --git a/target/linux/arc770/image/Makefile b/target/linux/arc770/image/Makefile
index 79ce71e726..f5e43f5bc9 100644
--- a/target/linux/arc770/image/Makefile
+++ b/target/linux/arc770/image/Makefile
@@ -11,46 +11,76 @@ include $(INCLUDE_DIR)/image.mk
 # in memory from build to built. Thus we need to extract EP from vmlinux
 # every time before generation of uImage.
 define Build/calculate-ep
-	$(eval KERNEL_ENTRY=$(shell $(KERNEL_CROSS)readelf -h $(LINUX_DIR)/vmlinux | grep "Entry point address" | grep -o 0x.*))
+	$(eval KERNEL_ENTRY=$(shell $(KERNEL_CROSS)readelf -h $(1) | grep "Entry point address" | grep -o 0x.*))
 endef
 
-define Build/patch-dtb
-	$(call Image/BuildDTB,$(DTS_DIR)/$(DEVICE_DTS).dts,$@.dtb)
-	$(STAGING_DIR_HOST)/bin/patch-dtb $@ $@.dtb
+define Build/build-dtb
+	$(call Image/BuildDTB,$(DTS_DIR)/$(DEVICE_DTS).dts,$(DTS_DIR)/$(DEVICE_DTS).dtb)
 endef
 
-# Shared device definition: applies to every defined device
-define Device/Default
-  PROFILES = Default $$(DEVICE_PROFILE)
-  KERNEL_DEPENDS = $$(wildcard ../dts/$$(DEVICE_DTS).dts)
-  DEVICE_PROFILE :=
+define Build/patch-dtb
+	$(STAGING_DIR_HOST)/bin/patch-dtb $@ $(DTS_DIR)/$(DEVICE_DTS).dtb
 endef
-DEVICE_VARS += DEVICE_PROFILE
 
+ifneq ($(CONFIG_TARGET_ROOTFS_INITRAMFS),)
+# Root FS built-in
 define Device/vmlinux
-  KERNEL_SUFFIX := .elf
-  KERNEL_INITRAMFS := kernel-bin | patch-dtb
-  KERNEL_INITRAMFS_NAME = vmlinux-initramfs.elf
-endef
-
-define Device/uImage
-  KERNEL_SUFFIX := -uImage
-  KERNEL_INITRAMFS := kernel-bin | patch-dtb | calculate-ep | uImage none
-  KERNEL_LOADADDR := 0x80000000
+	KERNEL_SUFFIX := .elf
+	KERNEL := kernel-bin | build-dtb | patch-dtb
+	KERNEL_INITRAMFS_NAME = vmlinux-initramfs.elf
 endef
 
-define Device/axs101
-	$(call Device/uImage)
-	DEVICE_PROFILE := axs101
-	DEVICE_DTS := axs101
-endef
-TARGET_DEVICES += axs101
-
 define Device/nsim
 	$(call Device/vmlinux)
 	DEVICE_PROFILE := nsim
 	DEVICE_DTS := nsim_700
 endef
 TARGET_DEVICES += nsim
+endif
+
+# Root FS on SD-card
+KERNEL_LOADADDR := 0x80000000
+DEVICE_DTS_LIST:= axs101
+FAT32_BLOCK_SIZE=1024
+FAT32_BLOCKS=$(shell echo $$(($(CONFIG_AXS10X_SD_BOOT_PARTSIZE)*1024*1024/$(FAT32_BLOCK_SIZE))))
+
+define Image/Build/SDCard
+	rm -f $(KDIR_TMP)/$(IMG_PREFIX)-$(PROFILE)-boot.img
+	mkdosfs $(KDIR_TMP)/$(IMG_PREFIX)-$(PROFILE)-boot.img -C $(FAT32_BLOCKS)
+	mkimage -C none -A arc -T script -d uEnv.txt $(BIN_DIR)/uEnv.scr
+	mcopy -i $(KDIR_TMP)/$(IMG_PREFIX)-$(PROFILE)-boot.img $(BIN_DIR)/uEnv.scr ::boot.scr
+	mcopy -i $(KDIR_TMP)/$(IMG_PREFIX)-$(PROFILE)-boot.img $(DTS_DIR)/*.dtb ::
+	mcopy -i $(KDIR_TMP)/$(IMG_PREFIX)-$(PROFILE)-boot.img $(BIN_DIR)/$(IMG_PREFIX)-uImage ::uImage
+
+	./gen_axs10x_sdcard_img.sh \
+		$(BIN_DIR)/$(IMG_PREFIX)-$(PROFILE)-sdcard-vfat-$(1).img \
+		$(KDIR_TMP)/$(IMG_PREFIX)-$(PROFILE)-boot.img \
+		$(KDIR)/root.$(1) \
+		$(CONFIG_AXS10X_SD_BOOT_PARTSIZE) \
+		$(CONFIG_TARGET_ROOTFS_PARTSIZE)
+
+ifneq ($(CONFIG_TARGET_IMAGES_GZIP),)
+	gzip -f9n $(BIN_DIR)/$(IMG_PREFIX)-$(PROFILE)-sdcard-vfat-$(1).img
+endif
+endef
+
+define Image/BuildKernel
+	# Build unified uImage
+	$(call Build/calculate-ep, $(KDIR)/vmlinux.elf)
+	$(call Image/BuildKernel/MkuImage, \
+		none, $(KERNEL_LOADADDR), $(KERNEL_ENTRY), \
+		$(KDIR)/vmlinux, \
+		$(BIN_DIR)/$(IMG_PREFIX)-uImage \
+	)
+
+	# Build .dtb for all boards we may run on
+	$(foreach DEVICE_DTS,$(shell echo $(DEVICE_DTS_LIST)), $(call Build/build-dtb))
+endef
+
+define Image/Build
+	$(call Image/Build/$(1),$(1))
+	$(call Image/Build/SDCard,$(1))
+	dd if=$(KDIR)/root.$(1) of=$(BIN_DIR)/$(IMG_PREFIX)-root.$(1) bs=128k conv=sync
+endef
 
 $(eval $(call BuildImage))
diff --git a/target/linux/arc770/image/gen_axs10x_sdcard_img.sh b/target/linux/arc770/image/gen_axs10x_sdcard_img.sh
new file mode 100755
index 0000000000..9a6f93d0d9
--- /dev/null
+++ b/target/linux/arc770/image/gen_axs10x_sdcard_img.sh
@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+
+#
+# Copyright (C) 2016 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+set -x
+[ $# -eq 5 ] || {
+    echo "SYNTAX: $0 <file> <bootfs image> <rootfs image> <bootfs size> <rootfs size>"
+    exit 1
+}
+
+OUTPUT="$1"
+BOOTFS="$2"
+ROOTFS="$3"
+BOOTFSSIZE="$4"
+ROOTFSSIZE="$5"
+
+head=4
+sect=63
+
+set `ptgen -o $OUTPUT -h $head -s $sect -l 1024 -t c -p ${BOOTFSSIZE}M -t 83 -p ${ROOTFSSIZE}M`
+
+BOOTOFFSET="$(($1 / 512))"
+BOOTSIZE="$(($2 / 512))"
+ROOTFSOFFSET="$(($3 / 512))"
+ROOTFSSIZE="$(($4 / 512))"
+
+dd bs=512 if="$BOOTFS" of="$OUTPUT" seek="$BOOTOFFSET" conv=notrunc
+dd bs=512 if="$ROOTFS" of="$OUTPUT" seek="$ROOTFSOFFSET" conv=notrunc
diff --git a/target/linux/arc770/image/uEnv.txt b/target/linux/arc770/image/uEnv.txt
new file mode 100644
index 0000000000..35549cb1c4
--- /dev/null
+++ b/target/linux/arc770/image/uEnv.txt
@@ -0,0 +1,7 @@
+setenv kernel_addr_r 0x82000000
+setenv fdt_addr_r 0x83000000
+setenv loadkernel fatload mmc 0 \$(kernel_addr_r) uImage
+setenv loaddtb fatload mmc 0 \$(fdt_addr_r) \$(dts)
+setenv bootargs earlycon=uart8250,mmio32,0xe0022000,115200n8 console=ttyS3,115200n8 root=/dev/mmcblk0p2 rootwait print-fatal-signals=1
+setenv uenvcmd run loadkernel\; run loaddtb\; bootm \$(kernel_addr_r) - \$(fdt_addr_r)
+run uenvcmd