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#
# Copyright (C) 2015 OpenWrt.org
#
. /lib/functions.sh
#Note: this code also uses some functions from nand.sh, but it is expected to be run by nand.sh, so we are not
#sourcing it explicitly here
UBNT_ERX_KERNEL_INDEX_OFFSET=160
ubnt_get_target_kernel() {
local factory_mtd=$1
local current_kernel_index=$(hexdump -s $UBNT_ERX_KERNEL_INDEX_OFFSET -n 1 -e '/1 "%X "' ${factory_mtd})
if [ $current_kernel_index == "0" ]; then
echo 'kernel2'
elif [ $current_kernel_index == "1" ]; then
echo 'kernel1'
fi
}
ubnt_update_target_kernel() {
local factory_mtd=$1
local kernel_part=$2
local new_kernel_index
if [ $kernel_part == "kernel1" ]; then
new_kernel_index="\x00"
elif [ $kernel_part == "kernel2" ]; then
new_kernel_index="\x01"
else
echo 'Unknown kernel image index' >&2
return 1
fi
if ! (echo -e $new_kernel_index | dd of=${factory_mtd} bs=1 count=1 seek=$UBNT_ERX_KERNEL_INDEX_OFFSET); then
echo 'Failed to update kernel bootup index' >&2
return 1
fi
}
platform_upgrade_ubnt_erx() {
local factory_mtd=$(find_mtd_part factory)
if [ -z "$factory_mtd" ]; then
echo "cannot find factory partition" >&2
exit 1
fi
local kernel_part="$(ubnt_get_target_kernel ${factory_mtd})"
if [ -z "$kernel_part" ]; then
echo "cannot find factory partition" >&2
exit 1
fi
# This is a global defined in nand.sh, sets partition kernel will be flashed into
CI_KERNPART=${kernel_part}
#Remove volume possibly left over from stock firmware
local ubidev="$( nand_find_ubi "$CI_UBIPART" )"
if [ -z "$ubidev" ]; then
local mtdnum="$( find_mtd_index "$CI_UBIPART" )"
if [ -z "$mtdnum" ]; then
echo "cannot find ubi mtd partition $CI_UBIPART" >&2
exit 1
fi
ubiattach -m "$mtdnum"
sync
ubidev="$( nand_find_ubi "$CI_UBIPART" )"
fi
if [ -n "$ubidev" ]; then
local troot_ubivol="$( nand_find_volume $ubidev troot )"
[ -n "$troot_ubivol" ] && ubirmvol /dev/$ubidev -N troot || true
fi
ubnt_update_target_kernel ${factory_mtd} ${kernel_part} || exit 1
}
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