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

[openwrt/svn-archive/archive.git] / target / linux / x86-2.6 / image / gen_image.sh

diff --git a/target/linux/x86-2.6/image/gen_image.sh b/target/linux/x86-2.6/image/gen_image.sh
index 21deeee6acdecd5e942b438c575e01c23eae0863..b4845f5a7783f4bc9274b3c7bf9e84056c7e7172 100755 (executable)
--- a/target/linux/x86-2.6/image/gen_image.sh
+++ b/target/linux/x86-2.6/image/gen_image.sh
@@ -1,60 +1,44 @@
 #!/usr/bin/env bash
 # Copyright (C) 2006 OpenWrt.org
-
+set -x 
 [ $# == 5 ] || {
     echo "SYNTAX: $0 <file> <kernel size> <kernel directory> <rootfs size> <rootfs image>"
     exit 1
 }
 
-file="$1"
-part1s="$2"
-part1d="$3"
-part2s="$4"
-part2f="$5"
+OUTPUT="$1"
+KERNELSIZE="$2"
+KERNELDIR="$3"
+ROOTFSSIZE="$4"
+ROOTFSIMAGE="$5"
+
+rm -f "$OUTPUT"
 
 head=16
 sect=63
-cyl=$(( ($part1s + $part2s) * 1024 * 1024 / ($head * $sect * 512)))
-
-dd if=/dev/zero of="$file" bs=1M count=$(($part1s + $part2s))  2>/dev/null || exit
-fdisk -u -C $cyl -H $head -S $sect "$file" > /dev/null 2>/dev/null <<EOF
-n
-p
-1
-
-+$(($part1s * 1024))K
-n
-p
-2
+cyl=$(( ($KERNELSIZE + $ROOTFSSIZE) * 1024 * 1024 / ($head * $sect * 512)))
 
+# create partition table
+set `ptgen -o "$OUTPUT" -h $head -s $sect -p ${KERNELSIZE}m -p ${ROOTFSSIZE}m`
 
-w
-q
-EOF
-
-block() {
-    echo -e 'p\nq' | fdisk -u -C $cyl -H $head -S $sect "$file" | awk -v file="$file$1" -v n="$(($2 + 2))" '
-$1 == file {
-    print $n * 512
-}'
-}
-
-start="$(block 1 0)"
-end="$(block 1 1)"
-blocks="$(( ($end - $start) / 1024 ))"
+KERNELOFFSET="$(($1 / 512))"
+ROOTFSOFFSET="$(($2 / 512))"
+ROOTFSSIZE="$(( ($3 - $2) / 512))"
 
-genext2fs -d "$part1d" -b "$blocks" "$file.kernel"
-dd if="$file.kernel" of="$file" bs=512 seek="$(($start / 512))" conv=notrunc
-rm -f "$file.kernel"
+BLOCKS="$((($ROOTFSOFFSET - $KERNELOFFSET) / 2 - 1))"
 
-start="$(block 2 0)"
-dd if="$part2f" of="$file" bs=512 seek="$(($start / 512))" conv=notrunc
+genext2fs -d "$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"
 
 which chpax >/dev/null && chpax -zp $(which grub)
-grub --device-map=/dev/null <<EOF
-device (hd0) $file
+grub --batch --no-curses --no-floppy --device-map=/dev/null <<EOF
+device (hd0) $OUTPUT
 geometry (hd0) $cyl $head $sect
 root (hd0,0)
 setup (hd0)
+quit
 EOF