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authorJames <>2015-11-04 11:49:21 +0000
committerJames <>2015-11-04 11:49:21 +0000
commit716ca530e1c4515d8683c9d5be3d56b301758b66 (patch)
tree700eb5bcc1a462a5f21dcec15ce7c97ecfefa772 /target/linux/ramips/base-files/lib/preinit/04_handle_checksumming
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Diffstat (limited to 'target/linux/ramips/base-files/lib/preinit/04_handle_checksumming')
-rw-r--r--target/linux/ramips/base-files/lib/preinit/04_handle_checksumming56
1 files changed, 56 insertions, 0 deletions
diff --git a/target/linux/ramips/base-files/lib/preinit/04_handle_checksumming b/target/linux/ramips/base-files/lib/preinit/04_handle_checksumming
new file mode 100644
index 0000000..057fe45
--- /dev/null
+++ b/target/linux/ramips/base-files/lib/preinit/04_handle_checksumming
@@ -0,0 +1,56 @@
+#!/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_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 $partname
+ else
+ echo "Checksum is already zero, nothing to do."
+ fi
+ ;;
+ rt-n56u)
+ echo "Board is ASUS RT-N56U, replacing uImage header..."
+ local firmware_mtd=$(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