OpenWrt – Blame information for rev 4
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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4 | office | 1 | #!/bin/sh |
| 2 | |||
| 3 | # Netgear WNCE2001 has does a checksum check on boot and goes into recovery |
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| 4 | # tftp mode when the check fails. Initializing the JFFS2 partition triggers |
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| 5 | # this, so we make sure to zero checksum and size to be checksummed before |
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| 6 | # that happens, so this needs to run very early during boot. |
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| 7 | |||
| 8 | do_checksumming_disable() { |
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| 9 | . /lib/functions.sh |
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| 10 | |||
| 11 | local board=$(board_name) |
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| 12 | |||
| 13 | case "$board" in |
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| 14 | wnce2001) |
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| 15 | echo "Board is WNCE2001, updating checksum partition..." |
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| 16 | local zeroes=/dev/zero |
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| 17 | local tmpfile=/tmp/wnce2001_checksum |
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| 18 | local partname=checksum |
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| 19 | local mtd=$(find_mtd_part $partname) |
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| 20 | dd if=$mtd of=$tmpfile bs=80 count=1 2>/dev/null |
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| 21 | signature=$(dd if=$tmpfile bs=1 skip=24 count=20 2>/dev/null) |
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| 22 | checksum=$(dd if=$tmpfile bs=1 count=4 2>/dev/null | hexdump -v -n 4 -e '1/1 "%02x"') |
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| 23 | if [ "$signature" != "RT3052-AP-WNCE2001-3" ]; then |
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| 24 | echo "Signature of checksum partition is wrong, bailing." |
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| 25 | return 0 |
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| 26 | fi |
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| 27 | if [ "$checksum" != "00000000" ]; then |
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| 28 | echo "Checksum is set, zeroing." |
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| 29 | # zero out checksum |
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| 30 | dd if=$zeroes of=$tmpfile conv=notrunc bs=1 seek=0 count=4 2>/dev/null |
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| 31 | # zero out bytecount to be checksummed |
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| 32 | dd if=$zeroes of=$tmpfile conv=notrunc bs=1 seek=60 count=4 2>/dev/null |
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| 33 | mtd write $tmpfile $partname |
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| 34 | else |
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| 35 | echo "Checksum is already zero, nothing to do." |
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| 36 | fi |
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| 37 | ;; |
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| 38 | rt-n56u) |
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| 39 | echo "Board is ASUS RT-N56U, replacing uImage header..." |
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| 40 | local firmware_mtd=$(find_mtd_part firmware) |
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| 41 | local rootfs_mtd=$(find_mtd_part rootfs) |
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| 42 | local rootfs_data_mtd=$(find_mtd_part rootfs_data) |
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| 43 | local rootfs_len=$(grep \"rootfs\" /proc/mtd | awk -F' ' '{print "0x"$2}') |
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| 44 | local rootfs_data_len=$(grep \"rootfs_data\" /proc/mtd | awk -F' ' '{print "0x"$2}') |
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| 45 | local offset=$(echo "$rootfs_len $rootfs_data_len 0x40" | awk -F' ' '{printf "%i",$1-$2-$3}') |
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| 46 | local signature=$(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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| 47 | if [ "$signature" = "27051956" ]; then |
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| 48 | dd conv=notrunc if=$rootfs_mtd skip=$offset of=$firmware_mtd bs=1 count=64 2>/dev/null |
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| 49 | fi |
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| 50 | ;; |
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| 51 | esac |
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| 52 | |||
| 53 | return 0 |
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| 54 | } |
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| 55 | |||
| 56 | boot_hook_add preinit_main do_checksumming_disable |