rebuild-esp32-linux: add script

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

Author: jcmvbkbc

rebuild-esp32-linux.sh

@@ -0,0 +1,107 @@
+#! /bin/bash -x
+
+#
+# environment variables affecting the build:
+#
+# keep_toolchain=y	-- don't rebuild the toolchain, but rebuild everything else
+# keep_rootfs=y		-- don't reconfigure or rebuild rootfs from scratch. Would still apply overlay changes
+# keep_buildroot=y	-- don't redownload the buildroot, only git pull any updates into it
+# keep_bootloader=y	-- don't redownload the bootloader, only rebuild it
+# keep_etc=y		-- don't overwrite the /etc partition
+#
+
+SET_BAUDRATE='-b 1000000'
+
+CTNG_VER=xtensa-fdpic
+CTNG_CONFIG=xtensa-esp32-linux-uclibcfdpic
+BUILDROOT_VER=xtensa-2023.11-fdpic
+BUILDROOT_CONFIG=esp32_defconfig
+ESP_BOOTLOADER_VER=linux-5.1.2
+ESP_BOOTLOADER_CONFIG=sdkconfig.defaults.esp32
+
+if [ ! -d autoconf-2.71/root/bin ] ; then
+	wget https://ftp.gnu.org/gnu/autoconf/autoconf-2.71.tar.xz
+	tar -xf autoconf-2.71.tar.xz
+	pushd autoconf-2.71
+	./configure --prefix=`pwd`/root
+	make && make install
+	popd
+fi
+export PATH=`pwd`/autoconf-2.71/root/bin:$PATH
+
+if [ -z "$keep_toolchain$keep_buildroot$keep_rootfs$keep_bootloader" ] ; then
+	rm -rf build
+else
+	[ -n "$keep_rootfs" ] || rm -rf build/build-buildroot-esp32
+	[ -n "$keep_buildroot" ] || rm -rf build/buildroot
+	[ -n "$keep_bootloader" ] || rm -rf build/esp-idf
+fi
+mkdir -p build
+cd build
+
+#
+# dynconfig
+#
+if [ ! -f xtensa-dynconfig/esp32.so ] ; then
+	git clone https://github.com/jcmvbkbc/xtensa-dynconfig -b original
+	wget https://github.com/jcmvbkbc/xtensa-toolchain-build/raw/e46089b8418f27ecd895881f071aa192dd7f42b5/overlays/original/esp32.tar.gz
+	mkdir esp32
+	tar -xf esp32.tar.gz -C esp32
+	sed -i 's/\(XSHAL_ABI\s\+\)XTHAL_ABI_WINDOWED/\1XTHAL_ABI_CALL0/' esp32/{binutils,gcc}/xtensa-config.h
+	make -C xtensa-dynconfig ORIG=1 CONF_DIR=`pwd` esp32.so
+fi
+export XTENSA_GNU_CONFIG=`pwd`/xtensa-dynconfig/esp32.so
+
+#
+# toolchain
+#
+if [ ! -x crosstool-NG/builds/xtensa-esp32-linux-uclibcfdpic/bin/xtensa-esp32-linux-uclibcfdpic-gcc ] ; then
+	git clone https://github.com/jcmvbkbc/crosstool-NG.git -b $CTNG_VER
+	pushd crosstool-NG
+	./bootstrap && ./configure --enable-local && make
+	./ct-ng $CTNG_CONFIG
+	CT_PREFIX=`pwd`/builds nice ./ct-ng build
+	popd
+	[ -x crosstool-NG/builds/xtensa-esp32-linux-uclibcfdpic/bin/xtensa-esp32-linux-uclibcfdpic-gcc ] || exit 1
+fi
+
+#
+# kernel and rootfs
+#
+if [ ! -d buildroot ] ; then
+	git clone https://github.com/jcmvbkbc/buildroot -b $BUILDROOT_VER
+else
+	pushd buildroot
+	git pull
+	popd
+fi
+if [ ! -d build-buildroot-esp32 ] ; then
+	nice make -C buildroot O=`pwd`/build-buildroot-esp32 $BUILDROOT_CONFIG
+	buildroot/utils/config --file build-buildroot-esp32/.config --set-str TOOLCHAIN_EXTERNAL_PATH `pwd`/crosstool-NG/builds/xtensa-esp32-linux-uclibcfdpic
+	buildroot/utils/config --file build-buildroot-esp32/.config --set-str TOOLCHAIN_EXTERNAL_PREFIX '$(ARCH)-esp32-linux-uclibcfdpic'
+	buildroot/utils/config --file build-buildroot-esp32/.config --set-str TOOLCHAIN_EXTERNAL_CUSTOM_PREFIX '$(ARCH)-esp32-linux-uclibcfdpic'
+fi
+nice make -C buildroot O=`pwd`/build-buildroot-esp32
+[ -f build-buildroot-esp32/images/xipImage -a -f build-buildroot-esp32/images/rootfs.cramfs -a -f build-buildroot-esp32/images/etc.jffs2 ] || exit 1
+
+#
+# bootloader
+#
+[ -d esp-idf ] || git clone https://github.com/jcmvbkbc/esp-idf -b $ESP_BOOTLOADER_VER
+pushd esp-idf
+. export.sh
+cd examples/get-started/linux_boot
+idf.py set-target esp32
+cp $ESP_BOOTLOADER_CONFIG sdkconfig
+idf.py build
+read -p 'ready to flash... press enter'
+while ! idf.py $SET_BAUDRATE flash ; do
+	read -p 'failure... press enter to try again'
+done
+popd
+
+#
+# flash
+#
+parttool.py $SET_BAUDRATE write_partition --partition-name linux  --input build-buildroot-esp32/images/xipImage
+parttool.py $SET_BAUDRATE write_partition --partition-name rootfs --input build-buildroot-esp32/images/rootfs.cramfs