QEMU not booting my image Post: 302485230

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Special Forums Hardware Filesystems, Disks and Memory QEMU not booting my image Post 302485230 by fpmurphy on Tuesday 4th of January 2011 03:15:41 PM

01-04-2011

Registered User

Here is a basic script which builds a small image with just GRUB Legacy on it and uses QEMU to test if the image boots. It is for Fedora 14 X64. All you need to do is change GRUBFILEDIR to point to the directory containing your GRUB stage{1,2} files.

Code:

#!/bin/bash
#
#  Create a bootable image containing just Legacy Grub
#  and use QEMU to test boot it if requested
#

if (( $(id -u) != 0 ))
then
    echo "ERROR: This script must be run as root" 1>&2
    exit 1
fi

GRUBFILEDIR=/usr/share/grub/x86_64-redhat
IMAGE=myimage
LOOPDEV=$(/sbin/losetup -f)

dd if=/dev/zero of=${IMAGE}.img bs=512 count=2880

if [[ -d ${IMAGE} ]]
then
    rm -rf ${IMAGE}
fi
mkdir -p ${IMAGE}/boot/grub

cp ${GRUBFILEDIR}/stage1 ${IMAGE}/boot/grub
cp ${GRUBFILEDIR}/stage2 ${IMAGE}/boot/grub

/sbin/losetup ${LOOPDEV} ${IMAGE}.img
/sbin/mke2fs ${LOOPDEV}
mount ${LOOPDEV} -o loop /mnt
chmod 777 /mnt
cp -aR ${IMAGE}/* /mnt
umount /mnt
cat <<EOF | /sbin/grub --batch --device-map=/dev/null
device (fd0) ${LOOPDEV}
root (fd0)
setup (fd0)
quit
EOF

/sbin/losetup -d ${LOOPDEV}

read -n1 -p "Use QEMU to boot the image (Y/N) "
echo
if [[ $REPLY = [yY] ]]
then
    qemu  -fda ${IMAGE}.img
fi

exit 0

You can easily extend it to include a kernel and other binaries.

fpmurphy

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LEARN ABOUT V7

installgrub

installgrub(1M) 														   installgrub(1M)

NAME

       installgrub - install GRUB in a disk partition or a floppy

SYNOPSIS

       /sbin/installgrub [-fm] stage1 stage2 raw-device

       The installgrub command is an -only program. GRUB stands for GRand Unified Bootloader.

       installgrub  installs  GRUB  stage  1  and  stage  2  files on the boot area of a disk partition. If you specify the -m option, installgrub
       installs the stage 1 file on the master boot sector of the disk.

       The installgrub command accepts the following options:

       -f

	   Suppresses interaction when overwriting the master boot sector.

       -m

	   Installs GRUB stage1 on the master boot sector interactively.

       The installgrub command accepts the following operands:

       stage1

	   The name of the GRUB stage 1 file.

       stage2

	   The name of the GRUB stage 2 file.

       raw-device

	   The name of the device onto which GRUB code is to be installed. It must be a character device that is readable and writable.  For  disk
	   devices,  specify  the  slice  where  the  GRUB  menu  file	is  located.  (For Solaris it is the root slice.) For a floppy disk, it is
	   /dev/rdiskette.

       Example 1: Installing GRUB on a Hard Disk Slice

       The following command installs GRUB on a system where the root slice is c0d0s0:

       example# /sbin/installgrub /boot/grub/stage1 
		/boot/grub/stage2 /dev/rdsk/c0d0s0

       Example 2: Installing GRUB on a Floppy

       The following command installs GRUB on a formatted floppy:

       example# mount -F pcfs /dev/diskette /mnt
       # mkdir -p /mnt/boot/grub
       # cp /boot/grub/* /mnt/boot/grub
       # umount /mnt
       # cd /boot/grub
       # /sbin/installgrub stage1 stage2 /dev/rdiskette

       /boot/grub

	   Directory where GRUB files reside.

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

       boot(1M), fdisk(1M), fmthard(1M), kernel(1M), attributes(5)

       Installing GRUB on the master boot sector (-m option) overrides any boot manager currently installed on the machine. The system will always
       boot the GRUB in the Solaris partition regardless of which fdisk partition is active.

								    24 May 2005 						   installgrub(1M)