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@jeffsf jeffsf/lib_upgrade_linksys.sh Secret
Created Jun 15, 2019

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Linksys EA8300 Upgrade Fix
#!/bin/sh
linksys_get_target_firmware() {
local cur_boot_part mtd_ubi0
cur_boot_part=$(/usr/sbin/fw_printenv -n boot_part)
if [ -z "${cur_boot_part}" ] ; then
mtd_ubi0=$(cat /sys/devices/virtual/ubi/ubi0/mtd_num)
case $(egrep "^mtd${mtd_ubi0}:" /proc/mtd | cut -d '"' -f 2) in
kernel|rootfs)
cur_boot_part=1
;;
alt_kernel|alt_rootfs)
cur_boot_part=2
;;
esac
>&2 printf "Current boot_part='%s' selected from ubi0/mtd_num='%s'" \
"${cur_boot_part}" "${mtd_ubi0}"
fi
# OEM U-Boot for EA6350v3 and EA8300; bootcmd=
# if test $auto_recovery = no;
# then bootipq;
# elif test $boot_part = 1;
# then run bootpart1;
# else run bootpart2;
# fi
case $cur_boot_part in
1)
fw_setenv -s - <<-EOF
boot_part 2
auto_recovery yes
EOF
printf "alt_kernel"
return
;;
2)
fw_setenv -s - <<-EOF
boot_part 1
auto_recovery yes
EOF
printf "kernel"
return
;;
*)
return
;;
esac
}
linksys_get_root_magic() {
(get_image "$@" | dd skip=786432 bs=4 count=1 | hexdump -v -n 4 -e '1/1 "%02x"') 2>/dev/null
}
platform_do_upgrade_linksys() {
local magic_long="$(get_magic_long "$1")"
local rm_oem_fw_vols="squashfs ubifs" # from OEM [alt_]rootfs UBI
local vol
mkdir -p /var/lock
local part_label="$(linksys_get_target_firmware)"
touch /var/lock/fw_printenv.lock
if [ ! -n "$part_label" ]; then
echo "cannot find target partition"
exit 1
fi
local target_mtd=$(find_mtd_part "$part_label")
[ "$magic_long" = "73797375" ] && {
CI_KERNPART="$part_label"
if [ "$part_label" = "kernel" ]; then
CI_UBIPART="rootfs"
else
CI_UBIPART="alt_rootfs"
fi
local mtdnum="$( find_mtd_index "$CI_UBIPART" )"
if [ ! "$mtdnum" ]; then
echo "cannot find ubi mtd partition $CI_UBIPART"
return 1
fi
local ubidev="$( nand_find_ubi "$CI_UBIPART" )"
if [ ! "$ubidev" ]; then
ubiattach -m "$mtdnum"
sync
ubidev="$( nand_find_ubi "$CI_UBIPART" )"
fi
[ "$ubidev" ] && for vol in $rm_oem_fw_vols ; do
ubirmvol "/dev/$ubidev" -N "$vol" 2>/dev/null
done
# complete std upgrade
nand_upgrade_tar "$1"
}
[ "$magic_long" = "27051956" ] && {
# This magic is for a uImage (which is a sysupgrade image)
# check firmwares' rootfs types
local oldroot="$(linksys_get_root_magic $target_mtd)"
local newroot="$(linksys_get_root_magic "$1")"
if [ "$newroot" = "55424923" -a "$oldroot" = "55424923" ]; then
# we're upgrading from a firmware with UBI to one with UBI
# erase everything to be safe
# - Is that really needed? Won't remove (or comment) the if,
# because it may be needed in a future device.
#mtd erase $part_label
#get_image "$1" | mtd -n write - $part_label
echo "writing \"$1\" UBI image to \"$part_label\" (UBI)..."
get_image "$1" | mtd write - $part_label
else
echo "writing \"$1\" image to \"$part_label\""
get_image "$1" | mtd write - $part_label
fi
}
}
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