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 OPENSOLARIS

mkcd

mkcd(1M)						  System Administration Commands						  mkcd(1M)

NAME

       mkcd - create bootable Solaris ISO image

SYNOPSIS

       /usr/bin/mkcd -v [-l label] media-root iso

DESCRIPTION

       The  mkcd  utility takes media-root (the root of an on-disk Solaris install media) as input and creates a bootable Solaris ISO image in the
       file iso, using mkisofs(8). The file can then be burned onto a CD/DVD with utilities such as cdrw(1) or	cdrecord(1).  (Neither	mkisofs(8)
       nor cdrecord(1) are SunOS man pages.)

       Caution -

	 The directory tree media-root must contain the file boot/grub/stage2_eltorito, which will be written to the media boot sectors. This file
	 will be modified with some boot information, thus it must be writable. If necessary, first save a copy prior to running this utility.

OPTIONS

       The following options are supported:

       -l label

	   Sets label as the label/volume name of the ISO image.

       -v

	   Verbose. Multiple -v options increase verbosity.

OPERANDS

       The following operands are supported:

       media-root

	   Top-level directory of an on-disk Solaris install media.

       iso

	   Name of the output file which will contain the resulting ISO image.

EXAMPLES

       Example 1 Creating an ISO Image and Burning a CD/DVD

       The following commands create an ISO image from the content of s10u1 and burn the image to a CD/DVD.

	 # /usr/bin/mkcd s10u1 s10u1.iso
	 # /usr/bin/cdrw -i s10u1.iso

ATTRIBUTES

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

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

SEE ALSO

       cdrw(1), attributes(5)

       mkisofs(8), (/usr/share/man/man8/mkisofs.8), in the  SUNWfsman package (not a SunOS man page)

SunOS 5.11							    25 Jul 2008 							  mkcd(1M)