Re: cdrom boot for sgi

["R.A.Owen" <rao3@leicester.ac.uk>]

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 
...
>> setenv SystemPartition "scsi(0)disk(1)rdisk(0)partition(8)"
>> ls   
scsi(0)disk(1)rdisk(0)partition(8)/:
linux
>> linux
2027520+1764448+95120 entry: 0x8800246c
ARCH: SGI-IP22
PROMLIB: ARC firmware Version 1 Revision 10
CPU: MIPS-R4400 FPU<MIPS-R4400FPC> ICACHE DCACHE SCACHE 
CPU revision is: 00000460
FPU revision is: 00000500
Primary instruction cache 16kb, linesize 16 bytes.
Primary data cache 16kb, linesize 16 bytes.
Secondary cache sized at 1024K linesize 128 bytes.
TLB has 48 entries.
Linux version 2.4.16 (root@nocontrol) (gcc version 2.95.4 20011006 (Debian prerelease)) #1 Sun Dec 16
16:38:44 CET 2001
...

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.

Alex Owen


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