target/linux/x86-2.6/image/gen_image.sh

   1 #!/usr/bin/env bash
   2 # Copyright (C) 2006 OpenWrt.org
   3 set -x
   4 [ $# == 5 ] || {
   5     echo "SYNTAX: $0 <file> <kernel size> <kernel directory> <rootfs size> <rootfs image>"
   6     exit 1
   7 }
   8
   9 OUTPUT="$1"
  10 KERNELSIZE="$2"
  11 KERNELDIR="$3"
  12 ROOTFSSIZE="$4"
  13 ROOTFSIMAGE="$5"
  14
  15 rm -f "$OUTPUT"
  16
  17 head=16
  18 sect=63
  19 cyl=$(( ($KERNELSIZE + $ROOTFSSIZE) * 1024 * 1024 / ($head * $sect * 512)))
  20
  21 # create partition table
  22 set `ptgen -o "$OUTPUT" -h $head -s $sect -p ${KERNELSIZE}m -p ${ROOTFSSIZE}m`
  23
  24 KERNELOFFSET="$(($1 / 512))"
  25 ROOTFSOFFSET="$(($2 / 512))"
  26
  27 BLOCKS="$((($ROOTFSOFFSET - $KERNELOFFSET) / 2 - 1))"
  28
  29 genext2fs -d "$KERNELDIR" -b "$BLOCKS" "$OUTPUT.kernel"
  30 dd if="$OUTPUT.kernel" of="$OUTPUT" bs=512 seek="$KERNELOFFSET" conv=notrunc
  31 dd if="$ROOTFSIMAGE" of="$OUTPUT" bs=512 seek="$ROOTFSOFFSET" conv=notrunc
  32 #rm -f "$OUTPUT.kernel"
  33
  34 which chpax >/dev/null && chpax -zp $(which grub)
  35 grub --device-map=/dev/null <<EOF
  36 device (hd0) $OUTPUT
  37 geometry (hd0) $cyl $head $sect
  38 root (hd0,0)
  39 setup (hd0)
  40 EOF
  41