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#!/bin/sh
# 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_wnce2001_checksumming_disable() {
. /lib/ramips.sh
local board=$(ramips_board_name)
case "$board" in
wnce2001)
echo "Board is WNCE2001, updating checksum partition..."
local zeroes=/dev/zero
local tmpfile=/tmp/wnce2001_checksum
local partname=checksum
local mtd=$(find_mtd_part $partname)
dd if=$mtd of=$tmpfile bs=80 count=1 2>/dev/null
signature=$(dd if=$tmpfile bs=1 skip=24 count=20 2>/dev/null)
checksum=$(dd if=$tmpfile bs=1 count=4 2>/dev/null | hexdump -v -n 4 -e '1/1 "%02x"')
if [ "$signature" != "RT3052-AP-WNCE2001-3" ]; then
echo "Signature of checksum partition is wrong, bailing."
return 0
fi
if [ "$checksum" != "00000000" ]; then
echo "Checksum is set, zeroing."
# zero out checksum
dd if=$zeroes of=$tmpfile conv=notrunc bs=1 seek=0 count=4 2>/dev/null
# zero out bytecount to be checksummed
dd if=$zeroes of=$tmpfile conv=notrunc bs=1 seek=60 count=4 2>/dev/null
mtd write $tmpfile $partname
else
echo "Checksum is already zero, nothing to do."
fi
;;
esac
return 0
}
boot_hook_add preinit_main do_wnce2001_checksumming_disable
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