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add optional padding for x86 grub images (useful for running jffs2 images in qemu)

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@6359 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
nbd
2007-02-25 17:59:23 +00:00
parent a7d3700301
commit 51fc1b8875
3 changed files with 7 additions and 1 deletions
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target/linux/x86-2.6/image/gen_image.sh
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@@ -23,11 +23,13 @@ set `ptgen -o "$OUTPUT" -h $head -s $sect -p ${KERNELSIZE}m -p ${ROOTFSSIZE}m`
KERNELOFFSET="$(($1 / 512))"
ROOTFSOFFSET="$(($2 / 512))"
ROOTFSSIZE="$(( ($3 - $2) / 512))"
BLOCKS="$((($ROOTFSOFFSET - $KERNELOFFSET) / 2 - 1))"
genext2fs -d "$KERNELDIR" -b "$BLOCKS" "$OUTPUT.kernel"
dd if="$OUTPUT.kernel" of="$OUTPUT" bs=512 seek="$KERNELOFFSET" conv=notrunc
[ -n "$PADDING" ] && dd if=/dev/zero of="$OUTPUT" bs=512 seek="$ROOTFSOFFSET" conv=notrunc count="$ROOTFSSIZE"
dd if="$ROOTFSIMAGE" of="$OUTPUT" bs=512 seek="$ROOTFSOFFSET" conv=notrunc
#rm -f "$OUTPUT.kernel"