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mediatek: mt7623: re-write sysupgrade uImage.FIT on MMC 

Re-reading the partition table doesn't work reliably, it fails if
anything on the device is still in use and it's not trivial to prevent
every possible case of a block device still being in use somehow.

Therefore, instead of relying on the in-kernel partition parser to know
where to write the configuration backup, use OpenWrt's format-agnostic
fwtool to strip off all metadata from the image and count its blocks
while writing. In that way we can know where to write the config backup
without needing the kernel to parse the MBR and FIT structures.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This commit is contained in:
Daniel Golle 2021-11-12 11:50:26 +00:00
parent 0cbc6b16db
commit c3c67fe7b1
No known key found for this signature in database
GPG Key ID: 5A8F39C31C3217CA
2 changed files with 13 additions and 16 deletions
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27
target/linux/mediatek/mt7623/base-files/lib/upgrade/platform.sh
View File

@ -1,6 +1,6 @@
REQUIRE_IMAGE_METADATA=1
RAMFS_COPY_BIN='blockdev'
RAMFS_COPY_BIN='fwtool'
# Full system upgrade including preloader for MediaTek SoCs on eMMC or SD
mtk_mmc_full_upgrade() {
@ -84,19 +84,14 @@ platform_do_upgrade() {
case "$board" in
bananapi,bpi-r2)
sync
export_bootdevice
export_partdevice rootdev 0
blockdev --rereadpt /dev/$rootdev || return 1
export_partdevice fitpart 3
[ "$fitpart" ] || return 1
dd if=/dev/zero of=$fitpart bs=4096 count=1 2>/dev/null
blockdev --rereadpt /dev/$rootdev
get_image "$1" | dd of=$fitpart
blockdev --rereadpt /dev/$rootdev
local datapart=$(find_mmc_part "rootfs_data" $rootdev)
[ "$datapart" ] || return 0
dd if=/dev/zero of=$datapart bs=4096 count=1 2>/dev/null
echo $datapart > /tmp/sysupgrade.datapart
export UPGRADE_MMC_PARTDEV="/dev/$fitpart"
export UPGRADE_MMC_IMAGE_BLOCKS=$(($(get_image "$1" | fwtool -i /dev/null -T - | dd of=$UPGRADE_MMC_PARTDEV bs=512 2>&1 | grep "records out" | cut -d' ' -f1)))
[ "$UPGRADE_MMC_IMAGE_BLOCKS" ] || return 0
dd if=/dev/zero of=$UPGRADE_MMC_PARTDEV bs=512 seek=$UPGRADE_MMC_IMAGE_BLOCKS count=8
;;
unielec,u7623-02-emmc-512m)
@ -172,10 +167,12 @@ platform_check_image() {
}
platform_copy_config_mmc() {
[ -e "$UPGRADE_BACKUP" ] || return
local datapart=$(cat /tmp/sysupgrade.datapart)
[ "$datapart" ] || echo "no rootfs_data partition, cannot keep configuration." >&2
dd if="$UPGRADE_BACKUP" of=$datapart
if [ ! -e "$UPGRADE_BACKUP" ] ||
[ ! -e "$UPGRADE_MMC_PARTDEV" ] ||
[ ! "$UPGRADE_MMC_IMAGE_BLOCKS" ]; then
return
fi
dd if="$UPGRADE_BACKUP" of="$UPGRADE_MMC_PARTDEV" bs=512 seek=$UPGRADE_MMC_IMAGE_BLOCKS
sync
}

2
target/linux/mediatek/mt7623/target.mk
View File

@ -9,7 +9,7 @@ CPU_TYPE:=cortex-a7
CPU_SUBTYPE:=neon-vfpv4
KERNELNAME:=Image dtbs zImage
FEATURES+=display usbgadget
DEFAULT_PACKAGES+=blockdev uboot-envtools
DEFAULT_PACKAGES+=uboot-envtools
define Target/Description
Build firmware images for MediaTek mt7623 ARM based boards.