From 19a6f3dd11507759cbaf98904c48b66824f36d73 Mon Sep 17 00:00:00 2001
From: John Crispin <john@openwrt.org>
Date: Wed, 3 Dec 2014 20:22:37 +0000
Subject: [PATCH] procd: more nand takeover fixes

if the initramfs kernel and payload were flashed in one block, the payload might not be at the start of the ubi partition due to bad blocks inside the kernel partition.

Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 43513
---
 package/system/procd/files/nand-preinit.sh | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/package/system/procd/files/nand-preinit.sh b/package/system/procd/files/nand-preinit.sh
index bd2193c928..cf596246d1 100644
--- a/package/system/procd/files/nand-preinit.sh
+++ b/package/system/procd/files/nand-preinit.sh
@@ -4,14 +4,18 @@
 nand_takeover() {
 	. /lib/upgrade/nand.sh
 	mtd=$(find_mtd_index "$CI_UBIPART")
-	local file_type="$(identify $2)"
-	mtd -l 400 dump /dev/mtd$mtd > /tmp/takeover.hdr
-	MAGIC=$(dd if=/tmp/takeover.hdr bs=1 skip=261 count=5 2> /dev/null)
-	SIZE=$(printf "%d" 0x$(dd if=/tmp/takeover.hdr bs=4 count=1 2> /dev/null | hexdump -v -n 4 -e '1/1 "%02x"'))
-	[ "$MAGIC" = "ustar" ] && {
-		mtd -l $((SIZE + 4))  dump /dev/mtd$mtd | dd bs=1 skip=4 of=/tmp/sysupgrade.tar
-		nand_do_upgrade_stage2 /tmp/sysupgrade.tar
-	}
+	esize=$(cat /proc/mtd | grep mtd$mtd |cut -d" " -f 3)
+	[ -z "$esize" ] && return 1
+	esize=$(printf "%d" 0x$esize)
+	for a in `seq 0 64`; do
+		mtd -o $((a * esize)) -l 400 dump /dev/mtd$mtd > /tmp/takeover.hdr
+		MAGIC=$(dd if=/tmp/takeover.hdr bs=1 skip=261 count=5 2> /dev/null)
+		SIZE=$(printf "%d" 0x$(dd if=/tmp/takeover.hdr bs=4 count=1 2> /dev/null | hexdump -v -n 4 -e '1/1 "%02x"'))
+		[ "$MAGIC" = "ustar" ] && {
+			mtd -o $((a * esize)) -l $((SIZE + 4)) dump /dev/mtd$mtd | dd bs=1 skip=4 of=/tmp/sysupgrade.tar
+			nand_do_upgrade_stage2 /tmp/sysupgrade.tar
+		}
+	done
 }
 
 boot_hook_add initramfs nand_takeover
-- 
2.30.2