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Re: cdrom boot for sgi



On Tue, Apr 23, 2002 at 11:47:57AM +0100, R.A.Owen wrote:
> I have not got easy access to a cdburner right now so I tried making an iso image of disks-mips/ on
> /dev/sda (a hard disk... I have debian-mips installed on /dev/sdb)
> 
> I then used Flo's "tool [1]" to greate a volume header and dd'd that to /dev/sda 
> 
> RESULT:
> -------
> The boot PROM can load linux from the iso image using the fake volume
> header when the "enhanced iso image" is on a _hard_disk_
> 
> Here is the out put from the console booting from the PROM ...

Cool :) I like it :)

[... boot output ... ]

> The install system seems to start normally
> 
> Also I have noticed that the fake volheader has "number of heads" set to zero... can use fdisk to
> interogate this... A SGI boot CD has number of heads set to one.

That should be fixed easily - But this shows there is something wrong
with reading 512 byte blocks from a cdrom - I think we get low-level
(Read: scsi) errors when trying to issue a scsi read request on non 2048
byte aligned boundaries or something. One would need an scsi bus analyzer
to actually get more reasonable knowledge of what going on.

Flo
-- 
Florian Lohoff                  flo@rfc822.org             +49-5201-669912
Nine nineth on september the 9th              Welcome to the new billenium

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