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# Netgear WNCE2001 has does a checksum check on boot and goes into recovery
# tftp mode when the check fails. Initializing the JFFS2 partition triggers
# this, so we make sure to zero checksum and size to be checksummed before
# that happens, so this needs to run very early during boot.
do_checksumming_disable() {
. /lib/functions.sh
local board=$(board_name)
case "$board" in
asus,rt-n56u)
echo "Board is ASUS RT-N56U, replacing uImage header..."
local firmware_mtd=$(find_mtd_part firmware)
local rootfs_mtd=$(find_mtd_part rootfs)
local rootfs_data_mtd=$(find_mtd_part rootfs_data)
local rootfs_len=$(grep \"rootfs\" /proc/mtd | awk -F' ' '{print "0x"$2}')
local rootfs_data_len=$(grep \"rootfs_data\" /proc/mtd | awk -F' ' '{print "0x"$2}')
local offset=$(echo "$rootfs_len $rootfs_data_len 0x40" | awk -F' ' '{printf "%i",$1-$2-$3}')
local signature=$(dd if=$rootfs_mtd skip=$offset bs=1 count=4 2>/dev/null | hexdump -v -n 4 -e '1/1 "%02x"')
if [ "$signature" = "27051956" ]; then
dd conv=notrunc if=$rootfs_mtd skip=$offset of=$firmware_mtd bs=1 count=64 2>/dev/null
fi
;;
esac
return 0
}
boot_hook_add preinit_main do_checksumming_disable
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