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57 lines
2.1 KiB
Bash
57 lines
2.1 KiB
Bash
#!/bin/sh
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# Netgear WNCE2001 has does a checksum check on boot and goes into recovery
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# tftp mode when the check fails. Initializing the JFFS2 partition triggers
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# this, so we make sure to zero checksum and size to be checksummed before
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# that happens, so this needs to run very early during boot.
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do_checksumming_disable() {
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. /lib/ramips.sh
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local board=$(ramips_board_name)
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case "$board" in
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wnce2001)
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echo "Board is WNCE2001, updating checksum partition..."
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local zeroes=/dev/zero
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local tmpfile=/tmp/wnce2001_checksum
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local partname=checksum
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local mtd=$(find_mtd_part $partname)
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dd if=$mtd of=$tmpfile bs=80 count=1 2>/dev/null
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signature=$(dd if=$tmpfile bs=1 skip=24 count=20 2>/dev/null)
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checksum=$(dd if=$tmpfile bs=1 count=4 2>/dev/null | hexdump -v -n 4 -e '1/1 "%02x"')
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if [ "$signature" != "RT3052-AP-WNCE2001-3" ]; then
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echo "Signature of checksum partition is wrong, bailing."
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return 0
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fi
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if [ "$checksum" != "00000000" ]; then
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echo "Checksum is set, zeroing."
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# zero out checksum
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dd if=$zeroes of=$tmpfile conv=notrunc bs=1 seek=0 count=4 2>/dev/null
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# zero out bytecount to be checksummed
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dd if=$zeroes of=$tmpfile conv=notrunc bs=1 seek=60 count=4 2>/dev/null
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mtd write $tmpfile $partname
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else
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echo "Checksum is already zero, nothing to do."
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fi
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;;
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rt-n56u)
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echo "Board is ASUS RT-N56U, replacing uImage header..."
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local firmware_mtd=$(find_mtd_part firmware)
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local rootfs_mtd=$(find_mtd_part rootfs)
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local rootfs_data_mtd=$(find_mtd_part rootfs_data)
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local rootfs_len=$(grep \"rootfs\" /proc/mtd | awk -F' ' '{print "0x"$2}')
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local rootfs_data_len=$(grep \"rootfs_data\" /proc/mtd | awk -F' ' '{print "0x"$2}')
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local offset=$(echo "$rootfs_len $rootfs_data_len 0x40" | awk -F' ' '{printf "%i",$1-$2-$3}')
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local signature=$(dd if=$rootfs_mtd skip=$offset bs=1 count=4 2>/dev/null | hexdump -v -n 4 -e '1/1 "%02x"')
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if [ "$signature" = "27051956" ]; then
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dd conv=notrunc if=$rootfs_mtd skip=$offset of=$firmware_mtd bs=1 count=64 2>/dev/null
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fi
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;;
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esac
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return 0
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}
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boot_hook_add preinit_main do_checksumming_disable
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