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Mark Hobley
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 Posted: Sat Nov 01, 2008 1:26 am Post subject: Re: Problem: not booting from cd-rom |
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Joerg Schilling <js@cs.tu-berlin.de> wrote:
| Quote: | If you have problems you might also like to check whether you use a real
mkisofs or a modified version based on very old software.
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Hmmm. My disks are made from .iso files download from the distributer. I don't
actually create the iso images myself, so I am not using the mkisofs
tool, because this is being done by the distibution vendor.
Is there a tool that can examine the .iso files to check that the
boot-load-size is correct in the existing .iso image?
Also, what should be done to fix the problem, in the event that the
boot-load-size is not appropriately set for the drive? Is there a simple
tool to fix this parameter in the .iso image? Or does this involve
mounting the iso image, and repackaging it?
Mark.
--
Mark Hobley
Linux User: #370818 http://markhobley.yi.org/ |
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Henrik Carlqvist
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| Posted: Sat Nov 01, 2008 9:35 am Post subject: Re: Problem: not booting from cd-rom |
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| Quote: | Is there a tool that can examine the .iso files to check that the
boot-load-size is correct in the existing .iso image?
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strings file.iso | grep boot-load-size
The above will show the entire command line that was used for mkisofs.
| Quote: | Is there a simple tool to fix this parameter in the .iso image?
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Not that I know of.
| Quote: | Or does this involve mounting the iso image, and repackaging it?
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Probably, yes.
regards Henrik
--
The address in the header is only to prevent spam. My real address is:
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Joerg Schilling
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| Posted: Sat Nov 01, 2008 4:20 pm Post subject: Re: Problem: not booting from cd-rom |
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In article <i96st5-lon.ln1@neptune.markhobley.yi.org>,
Mark Hobley <markhobley@hotpop.donottypethisbit.com> wrote:
| Quote: | Joerg Schilling <js@cs.tu-berlin.de> wrote:
If you have problems you might also like to check whether you use a real
mkisofs or a modified version based on very old software.
Hmmm. My disks are made from .iso files download from the distributer. I don't
actually create the iso images myself, so I am not using the mkisofs
tool, because this is being done by the distibution vendor.
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If you are using someone else's images, you cannot influence them and would
need to get in contect with the producers.
| Quote: | Is there a tool that can examine the .iso files to check that the
boot-load-size is correct in the existing .iso image?
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You cannot check whether it is "correct" as this depends on the content
of the bootcode.
You may call "isodebug -i filename" to see the anonymized command line
that was used to create the image.
| Quote: | Also, what should be done to fix the problem, in the event that the
boot-load-size is not appropriately set for the drive? Is there a simple
tool to fix this parameter in the .iso image? Or does this involve
mounting the iso image, and repackaging it?
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Thre is a very low probability that changing this number will
help you.
--
EMail:joerg@schily.isdn.cs.tu-berlin.de (home) Jörg Schilling D-13353 Berlin
js@cs.tu-berlin.de (uni)
schilling@fokus.fraunhofer.de (work) Blog: http://schily.blogspot.com/
URL: http://cdrecord.berlios.de/private/ ftp://ftp.berlios.de/pub/schily |
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Mark Hobley
Guest
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| Posted: Sun Nov 02, 2008 7:53 am Post subject: Re: Problem: not booting from cd-rom |
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Joerg Schilling <js@cs.tu-berlin.de> wrote:
| Quote: | Thre is a very low probability that changing this number will
help you.
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Why is that Joerg? Is there something else that is preventing particular
disk images from being bootable in particular drives?
Mark.
--
Mark Hobley
Linux User: #370818 http://markhobley.yi.org/ |
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Michael Black
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| Posted: Sun Nov 02, 2008 8:28 pm Post subject: Re: Problem: not booting from cd-rom |
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On Sun, 2 Nov 2008, Mark Hobley wrote:
| Quote: | Joerg Schilling <js@cs.tu-berlin.de> wrote:
Thre is a very low probability that changing this number will
help you.
Why is that Joerg? Is there something else that is preventing particular
disk images from being bootable in particular drives?
I brought the point up because the bios may have problems, not the drive. |
I'm not going back to look over the messages, but I injected this at
a point when it didn't seem clear that the drive was the problem for
the original poster. It was another variable that might prevent booting.
Michael |
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Mark Hobley
Guest
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| Posted: Sun Nov 02, 2008 11:11 pm Post subject: Re: Problem: not booting from cd-rom |
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Michael Black <et472@ncf.ca> wrote:
| Quote: | I brought the point up because the bios may have problems, not the drive.
I'm not going back to look over the messages, but I injected this at
a point when it didn't seem clear that the drive was the problem for
the original poster.
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Yeah. He swapped the drive out for a fix. I have done that on a few
occasions, but I really would like to know what is wrong with the
drives.
I am currently having a problem with one of my machines. It used to run Debian
Sarge, and the original installation was made from a Debian Sarge disk.
However, the machine has since been upgraded (using online facilities)
and is now on Debian Etch.
I have a Debian Etch cdrom, which works fine in other machines, but when
I try to boot from it, the disk is ignored, and the system boots from the hard
drive. The bios parameters are correct, and the cdrom is the set as the
primary boot device.
The cdrom does not appear to be boot compatible with that particular
cdrom drive. The drive can read the cdrom ok, but cannot boot from it.
It can boot from a Debian Sarge cdrom.
| Quote: | It was another variable that might prevent booting.
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I'm going to examine the original .iso images for the Sarge and Etch
cdrom disks to see if there is anything different between them.
Mark.
--
Mark Hobley
Linux User: #370818 http://markhobley.yi.org/ |
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Trevor Hemsley
Guest
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| Posted: Mon Nov 03, 2008 2:13 am Post subject: Re: Problem: not booting from cd-rom |
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On Sun, 2 Nov 2008 17:11:09 UTC in comp.os.linux.hardware,
markhobley@hotpop.donottypethisbit.com (Mark Hobley) wrote:
| Quote: | It was another variable that might prevent booting.
I'm going to examine the original .iso images for the Sarge and Etch
cdrom disks to see if there is anything different between them.
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I seem to remember that there are two different boot formats for CDs - they can
either boot in floppy emulation mode (the older style) or in hard disk format. I
don't know if the drive itself makes any difference to which one is supported or
if it is a BIOS-only decision.
--
Trevor Hemsley, Brighton, UK
Trevor dot Hemsley at ntlworld dot com |
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