bcm4908: add sysupgrade support
It supports flashing OpenWrt images (bootfs & UBI upgrade) as well as vendor images (whole MTD partition write). Upgrading cferom is unsupported. It requires copying device specific data (like MAC) to target image before flashing. Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
This commit is contained in:
Rafał Miłecki
parent
e48c6400e4
commit
a6a0b252ba
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# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
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RAMFS_COPY_BIN="bcm4908img"
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PART_NAME=firmware
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# $(1): file to read from
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# $(2): offset in bytes
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# $(3): length in bytes
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get_content() {
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dd if="$1" skip=$2 bs=1 count=$3 2>/dev/null
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}
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# $(1): file to read from
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# $(2): offset in bytes
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get_hex_u32_be() {
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dd if="$1" skip=$2 bs=1 count=4 2>/dev/null | hexdump -v -e '1/1 "%02x"'
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}
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platform_expected_image() {
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local machine=$(board_name)
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case "$machine" in
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asus,gt-ac5300) echo "asus GT-AC5300";;
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netgear,r8000p) echo "chk U12H359T00_NETGEAR";;
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tplink,archer-c2300-v1) echo "";;
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esac
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}
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platform_identify() {
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local magic
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local size
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magic=$(get_hex_u32_be "$1" 0)
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case "$magic" in
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2a23245e)
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echo "chk"
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return
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;;
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esac
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size=$(wc -c "$1" | cut -d ' ' -f 1)
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magic=$(get_content "$1" $((size - 20 - 64 + 8)) 12)
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case "$magic" in
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GT-AC5300)
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echo "asus"
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return
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;;
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esac
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echo "unknown"
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}
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platform_check_image() {
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[ "$#" -gt 1 ] && return 1
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local expected_image=$(platform_expected_image)
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local error=0
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bcm4908img info -i "$1" > /dev/null || {
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echo "Failed to validate BCM4908 image" >&2
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notify_firmware_broken
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return 1
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}
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bcm4908img bootfs -i "$1" ls | grep -q "1-openwrt" || {
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# OpenWrt images have 1-openwrt dummy file in the bootfs.
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# Don't allow backup if it's missing
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notify_firmware_no_backup
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}
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case "$(platform_identify "$1")" in
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asus)
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local size=$(wc -c "$1" | cut -d ' ' -f 1)
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local productid=$(get_content "$1" $((size - 20 - 64 + 8)) 12)
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[ -n "$expected_image" -a "asus $productid" != "$expected_image" ] && {
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echo "Firmware productid mismatch ($productid)" >&2
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error=1
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}
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;;
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chk)
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local header_len=$((0x$(get_hex_u32_be "$1" 4)))
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local board_id_len=$(($header_len - 40))
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local board_id=$(dd if="$1" skip=40 bs=1 count=$board_id_len 2>/dev/null | hexdump -v -e '1/1 "%c"')
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[ -n "$expected_image" -a "chk $board_id" != "$expected_image" ] && {
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echo "Firmware board_id mismatch ($board_id)" >&2
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error=1
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}
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;;
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*)
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echo "Invalid image type. Please use firmware specific for this device." >&2
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notify_firmware_broken
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error=1
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;;
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esac
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return $error
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}
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# $1: cferam index increment value
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platform_calc_new_cferam() {
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local inc="$1"
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local dir="/tmp/sysupgrade-bcm4908"
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local mtd=$(find_mtd_part bootfs)
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[ -z "$mtd" ] && {
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echo "Failed to find bootfs partition" >&2
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return
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}
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rm -fR $dir
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mkdir -p $dir
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mount -t jffs2 -o ro $mtd $dir || {
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echo "Failed to mount bootfs partition $mtd" >&2
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rm -fr $dir
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return
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}
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local idx=$(ls $dir/cferam.??? | sed -n 's/.*cferam\.\(\d\d\d\)/\1/p')
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[ -z "$idx" ] && {
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echo "Failed to find cferam current index" >&2
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rm -fr $dir
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return
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}
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umount $dir
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rm -fr $dir
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idx=$(((idx + inc) % 1000))
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echo $(printf "cferam.%03d" $idx)
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}
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platform_do_upgrade_ubi() {
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local dir="/tmp/sysupgrade-bcm4908"
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local inc=1
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# Verify new bootfs size
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local mtd_bootfs_size=$(grep "\"bootfs\"" /proc/mtd | sed "s/mtd[0-9]*:[ \t]*\([^ \t]*\).*/\1/")
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[ -z "$mtd_bootfs_size" ] && {
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echo "Unable to find \"bootfs\" partition size"
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return
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}
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mtd_bootfs_size=$((0x$mtd_bootfs_size))
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local img_bootfs_size=$(bcm4908img extract -i "$1" -t bootfs | wc -c)
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[ $img_bootfs_size -gt $mtd_bootfs_size ] && {
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echo "New bootfs doesn't fit MTD partition."
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return
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}
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# Find cferam name for new firmware
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# For UBI we always flash "firmware" so don't increase cferam index if
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# there is "fallback". That could result in cferam.999 & cferam.001
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[ -n "$(find_mtd_index backup)" -o -n "$(find_mtd_index fallback)" ] && inc=0
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local cferam=$(platform_calc_new_cferam $inc)
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[ -z "$cferam" ] && exit 1
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# Prepare new firmware
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bcm4908img bootfs -i "$1" mv cferam.000 $cferam || {
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echo "Failed to rename cferam.000 to $cferam" >&2
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exit 1
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}
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# Extract rootfs for further flashing
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rm -fr $dir
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mkdir -p $dir
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bcm4908img extract -i "$1" -t rootfs > $dir/root || {
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echo "Failed to extract rootfs" >&2
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rm -fr $dir
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exit 1
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}
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# Flash bootfs MTD partition with new one
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mtd erase bootfs || {
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echo "Failed to erase bootfs" >&2
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rm -fr $dir
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exit 1
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}
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bcm4908img extract -i "$1" -t bootfs | mtd write - bootfs || {
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echo "Failed to flash bootfs" >&2
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rm -fr $dir
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exit 1
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}
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nand_do_upgrade $dir/root
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}
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platform_do_upgrade() {
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# Try NAND aware UBI upgrade for OpenWrt images
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# Below call will exit on success
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bcm4908img bootfs -i "$1" ls | grep -q "1-openwrt" && platform_do_upgrade_ubi "$1"
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echo "Writing whole image to NAND flash. All erase counters will be lost."
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# Find cferam name for new firmware
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local cferam=$(platform_calc_new_cferam 1)
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[ -z "$cferam" ] && exit 1
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# Prepare new firmware
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bcm4908img bootfs -i "$1" mv cferam.000 $cferam || {
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echo "Failed to rename cferam.000 to $cferam" >&2
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exit 1
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}
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# Jush flash firmware partition as is
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[ -n "$(find_mtd_index backup)" ] && PART_NAME=backup
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[ -n "$(find_mtd_index fallback)" ] && PART_NAME=fallback
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mtd erase $PART_NAME
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default_do_upgrade "$1" "bcm4908img extract -t firmware"
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}
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