QEMU not booting my image Post: 302484866

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Special Forums Hardware Filesystems, Disks and Memory QEMU not booting my image Post 302484866 by Corona688 on Monday 3rd of January 2011 01:13:37 PM

01-03-2011

Registered User

Quote:

Originally Posted by neur0n

ok I found these step on how to make a bootable image:

Code:

$ cd /usr/lib/grub/i386-pc
$ dd if=stage1 of=image.img bs=512 count=1
1+0 records in
1+0 records out
$ dd if=stage2 of=image.img bs=512 seek=1
153+1 records in
153+1 records out
$

But is this correct

Sort of. You didn't need to create image.img in the current directory, and probably shouldn't, and didn't need to run any of that as root. It also only creates a 105KB file, not a 1440KB file, so I'd modify it a little:

Code:

cd /usr/lib/grub/i386-pc
# make a completely blank disk image
dd if=/dev/zero of=~/image.img bs=512 count=2880
# copy the boot sector onto it.  "conv=notrunc" tells it not to shrink the file.
dd if=stage1 of=~/image.img conv=notrunc bs=512
# copy stage2 onto it
dd if=stage2 of=~/image.img conv=notrunc seek=1 bs=512

My system has them in /lib/grub/, not /usr/lib/grub incidentally, but systems do differ. "bs=512" is redundant since dd defaults to that but it doesn't hurt anything.

Quote:

and if it is will I be able to freely add files afterwards?

It contains no filesystem, there's nothing to add files to. It would only boot to a grub prompt.

But it should almost certainly be a valid boot disk image, with which you can test qemu.

---------- Post updated at 12:13 PM ---------- Previous update was at 12:05 PM ----------

[edit] the below instructions didn't work because the grub utility can't install on a floppy that way. argh.

Last edited by Corona688; 01-03-2011 at 02:33 PM..

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LEARN ABOUT DEBIAN

qemuctl

qemuctl(1)																qemuctl(1)

NAME

       qemuctl - Graphical control for qemu

SYNTAX

       qemuctl [-suspend-dir <dir>] [-suspend-file <filename>] [-qemu <qemu>]  [-nowakeup] qemu-options

DESCRIPTION

       qemuctl	is a gui that controls a qemu process with the built-in monitor of qemu. So you can change devices, suspend machines, save screen-
       shots, ...

       If you suspend a machine it will do the following macro:

       stop
       screendump "suspend-dir/suspend-file.ppm"
       savevm "suspend-dir/suspend-file.vm"
       commit
       quit

       You can afterwards resume the machine with:

       qemuctl -suspend-dir suspend-dir -suspend-file suspend-file your_qemu_options
       the suspend-files will then be deleted
       or
       qemuctl -loadvm suspend-dir/suspend-file.vm your_qemu_options

       Be aware that you can't use the "-monitor" option with qemuctl, because it needs the control over the monitor. The option  "-serial  stdio"
       can't be used, too.

OPTIONS

       -suspend-file <filename>
	      This  option  is	normaly  used by qemuctl to support suspend and wakeup. qemuctl can then find the vm-state-file in its folders and
	      wakeup the virtual machine. If the file is there the qemuctl waes up the virtual machine and deletes the file afterwards. On suspend
	      the  vm-state-file is then stored as the <filename> with the .vm ending and the screenshot is stored as the <filename> with the .ppm
	      ending.
	      Default filename is "suspend".

       -suspend-dir <dir>
	      This is the dir where the suspend files would be stored or expected.
	      Default is current dir.

       -nowakeup
	      Don't wake up even if the vm-file is there. Suspend still works.
	      Default is to wake up using the vm-file if it is there.

       -qemu <qemu>
	      The qemu variation to use. It can be qemu or kvm.
	      Default is qemu.

       qemu-options
	      Use qemu-options for the launch of qemu. See qemu(1) for further details.

FILES

       none

ENVIRONMENT VARIABLES

       none

EXAMPLES

       To use the suspend file 'Debian 3.1' and store/search it in the '/qemu' dir:

       qemuctl -suspend-file "Debian 3.1" -suspend-dir "/qemu" -boot c -hda hda.raw

       Alternativly you can run it with default suspend filenames:

       qemuctl -boot c -hda hda.raw

AUTHORS

       Peter Rustler

SEE ALSO

       qemu(1) qemu-launcher(1)

Peter Rustler							       0.0.1								qemuctl(1)