target/linux/x86/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 ${ROOTFSSIZE}m`
  23
  24 KERNELOFFSET="$(($1 / 512))"
  25 KERNELSIZE="$(($2 / 512))"
  26 ROOTFSOFFSET="$(($3 / 512))"
  27 ROOTFSSIZE="$(($4 / 512))"
  28
  29 BLOCKS="$((($KERNELSIZE / 2) - 1))"
  30
  31 genext2fs -d "$KERNELDIR" -b "$BLOCKS" "$OUTPUT.kernel"
  32 dd if="$OUTPUT.kernel" of="$OUTPUT" bs=512 seek="$KERNELOFFSET" conv=notrunc
  33 [ -n "$PADDING" ] && dd if=/dev/zero of="$OUTPUT" bs=512 seek="$ROOTFSOFFSET" conv=notrunc count="$ROOTFSSIZE"
  34 dd if="$ROOTFSIMAGE" of="$OUTPUT" bs=512 seek="$ROOTFSOFFSET" conv=notrunc
  35 #rm -f "$OUTPUT.kernel"
  36
  37 which chpax >/dev/null && chpax -zp $(which grub)
  38 grub --batch --no-curses --no-floppy --device-map=/dev/null <<EOF
  39 device (hd0) $OUTPUT
  40 geometry (hd0) $cyl $head $sect
  41 root (hd0,0)
  42 setup (hd0)
  43 quit
  44 EOF
  45