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 CENTOS

mkbootdisk

MKBOOTDISK(8)						      System Manager's Manual						     MKBOOTDISK(8)

NAME

       mkbootdisk - creates a stand-alone boot floppy for the running system

SYNOPSIS

       mkbootdisk [--version] [--noprompt] [--verbose]
		  [--device devicefile] [--size size]
		  [--kernelargs <args>] [--iso] kernel

DESCRIPTION

       mkbootdisk  creates  a  boot  floppy  appropriate for the running system. The boot disk is entirely self-contained, and includes an initial
       ramdisk image which loads any necessary SCSI modules for the system. The created boot disk looks for the root filesystem on the device sug-
       gested by /etc/fstab.  The only required argument is the kernel version to put onto the boot floppy.

OPTIONS

       --device devicefile
	      The  boot image is created on devicefile. If --device is not specified, /dev/fd0 is used. If devicefile does not exist mkinitrd cre-
	      ates a 1.44Mb floppy image using devicefile as the filename.

       --noprompt
	      Normally, mkbootdisk instructs the user to insert a floppy and waits for confirmation before continuing. If --noprompt is specified,
	      no prompt is displayed.

       --verbose
	      Instructs mkbootdisk to talk about what it's doing as it's doing it. Normally, there is no output from mkbootdisk.

       --iso  Instructs mkbootdisk to make a bootable ISO image as devicefile.

       --version
	      Displays the version of mkbootdisk and exits.

       --kernelargs args
	      Adds  args  to the arguments appended on the kernel command line. If this is not specified mkbootdisk uses grubby to parse the argu-
	      ments for the default kernel from grub.conf, if possible.

       --size size
	      Uses size (in kilobytes) as the size of the image to use for the boot disk.  If this is not  specified,  mkbootdisk  will  assume  a
	      standard 1.44Mb floppy device.

SEE ALSO

       grubby(8) dracut(8)

AUTHOR

       Erik Troan <ewt@redhat.com>

4th Berkeley Distribution					  Tue Mar 31 1998						     MKBOOTDISK(8)