1#!/usr/bin/env bash
2# Copyright (C) 2006-2012 OpenWrt.org
3set -x
4[ $# == 5 -o $# == 6 ] || {
5    echo "SYNTAX: $0 <file> <kernel size> <kernel directory> <rootfs size> <rootfs image> [<align>]"
6    exit 1
7}
8
9OUTPUT="$1"
10KERNELSIZE="$2"
11KERNELDIR="$3"
12ROOTFSSIZE="$4"
13ROOTFSIMAGE="$5"
14ALIGN="$6"
15
16rm -f "$OUTPUT"
17
18head=16
19sect=63
20cyl=$(( ($KERNELSIZE + $ROOTFSSIZE) * 1024 * 1024 / ($head * $sect * 512)))
21
22# create partition table
23set `ptgen -o "$OUTPUT" -h $head -s $sect -p ${KERNELSIZE}m -p ${ROOTFSSIZE}m ${ALIGN:+-l $ALIGN}`
24
25KERNELOFFSET="$(($1 / 512))"
26KERNELSIZE="$(($2 / 512))"
27ROOTFSOFFSET="$(($3 / 512))"
28ROOTFSSIZE="$(($4 / 512))"
29
30BLOCKS="$((($KERNELSIZE / 2) - 1))"
31
32[ -n "$PADDING" ] && dd if=/dev/zero of="$OUTPUT" bs=512 seek="$ROOTFSOFFSET" conv=notrunc count="$ROOTFSSIZE"
33dd if="$ROOTFSIMAGE" of="$OUTPUT" bs=512 seek="$ROOTFSOFFSET" conv=notrunc
34
35[ -n "$NOGRUB" ] && exit 0
36
37genext2fs -d "$KERNELDIR" -b "$BLOCKS" "$OUTPUT.kernel"
38dd if="$OUTPUT.kernel" of="$OUTPUT" bs=512 seek="$KERNELOFFSET" conv=notrunc
39rm -f "$OUTPUT.kernel"
40