Trevor Woerner at 17:15, 7 July 2011

2011-07-07T17:15:30Z

Trevor Woerner: Script for generating an Overo Qemu image

2011-07-07T17:13:12Z

Script for generating an Overo Qemu image

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<pre>
#!/bin/bash
# This script generates SD card disk images suitable for use with QEMU.
#
# Copyright (C) 2011 Ash Charles
# Based on:
# Narcissus - Online image builder for the angstrom distribution
# Copyright (C) 2008 - 2011 Koen Kooi
# Copyright (C) 2010 Denys Dmytriyenko
# and
# Linaro Images Tools.
# Author: Guilherme Salgado <guilherme.salgado@linaro.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

LC_ALL=C
set -e

function usage()
{
echo "This utility generates SD card images suitable for use with QEMU."
echo "Usage:"
echo " $0 <output name> <mlo> <u-boot> <kernel> <rootfs>"
echo "Example:"
echo " $0 sd.img ~/MLO ~/u-boot.bin ~/uImage ~/rootfs.tar.bz2"
}

function check_args()
{
echo $#
if [ $# -ne 5 ]; then
usage
exit 1
fi
OUTFILE=$1
MLO=$2
UBOOT=$3
KERNEL=$4
ROOTFS=$5

if ! [[ -e ${MLO} ]]; then
echo "MLO not found at ${MLO}! Quitting..."
exit 1
fi
if ! [[ -e ${UBOOT} ]]; then
echo "U-boot not found at ${UBOOT}! Quitting..."
exit 1
fi
if ! [[ -e ${KERNEL} ]]; then
echo "Kernel not found at ${KERNEL}! Quitting..."
exit 1
fi
if ! [[ -e ${ROOTFS} ]]; then
echo "Rootfs not found at ${ROOTFS}! Quitting..."
exit 1
fi
}

SIZE=1073741824 # 1G by default

function make_image()
{
qemu-img create -f raw ${OUTFILE} ${SIZE}

CYLINDERS=`echo ${SIZE}/255/63/512 | bc`
{
echo ,9,0x0C,*
echo ,,,-
} | sfdisk -D -H 255 -S 63 -C ${CYLINDERS} ${OUTFILE} &> /dev/null

# Reverse-engineer the partition setup
BYTES_PER_SECTOR="$(/sbin/fdisk -l -u ${OUTFILE} | grep Units | awk '{print $9}')"
VFAT_SECTOR_OFFSET="$(/sbin/fdisk -l -u ${OUTFILE} | grep img1 | awk '{print $3}')"
EXT3_SECTOR_OFFSET="$(/sbin/fdisk -l -u ${OUTFILE} | grep img2 | awk '{print $2}')"
}

function populate_image()
{
LOOP_DEV="/dev/loop1"
LOOP_DEV_FS="/dev/loop2"

echo "[ Format vfat partition ]"
/sbin/losetup -v -o $(expr ${BYTES_PER_SECTOR} "*" ${VFAT_SECTOR_OFFSET}) ${LOOP_DEV} ${OUTFILE}
mkfs.vfat -F 32 -n "boot" ${LOOP_DEV}

echo "[ Format ext3 partition ]"
/sbin/losetup -v -o $(expr ${BYTES_PER_SECTOR} "*" ${EXT3_SECTOR_OFFSET}) ${LOOP_DEV_FS} ${OUTFILE}
/sbin/mkfs.ext3 -L rootfs ${LOOP_DEV_FS}

echo "[ Copying files to vfat ]"
mount ${LOOP_DEV} /mnt
cp -v ${MLO} /mnt/MLO
cp -v ${UBOOT} /mnt/u-boot.bin
cp -v ${KERNEL} /mnt/uImage
umount ${LOOP_DEV}

echo "[ Copying file system ]"
mount ${LOOP_DEV_FS} /mnt
tar xaf ${ROOTFS} -C /mnt
umount ${LOOP_DEV_FS}

echo "[ Clean up ]"
/sbin/losetup -d ${LOOP_DEV}
/sbin/losetup -d ${LOOP_DEV_FS}
}

ARGS=$*
check_args $ARGS
make_image
populate_image
</pre>

← Older revision		Revision as of 17:15, 7 July 2011
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		+	[[Category:How to - qemu]]
	<pre>		<pre>
	#!/bin/bash		#!/bin/bash

Overo qemu script - Revision history

Trevor Woerner at 17:15, 7 July 2011

Trevor Woerner: Script for generating an Overo Qemu image