Re: I'm back on linux-m68k

[Joshua Juran <jjuran@gmail.com>]

On Nov 8, 2008, at 5:12 AM, Finn Thain wrote:

> On Sat, 8 Nov 2008, Joshua Juran wrote:
>
>> So far, I haven't been able to boot my 950 while a drive connected to
>> the external bus was powered on.  The external drive's access  
>> light goes
>> on immediately after the screen lights up grey, and startup gets  
>> as far
>> as drawing the Mac OS splash screen and maybe 12 pixels of progress
>> before halting, resuming normally if I power off the external drive.
>>
>> Any ideas?
>
> I see the same issue sometimes. I don't think it is a termination  
> problem
> but it is hard to say. You could try installing drivers from HD SC  
> Setup,
> Drive Setup, Silverlinig or HDT etc.

I had no such problems using a removable storage drive, although I  
had to tighten the cable before it was recognized, so it may have  
been a cabling issue originally.

Anyway, with regards to startup devices, there's no distinction  
between the buses.  If you select the device at SCSI ID 5 on bus 1,  
the XPRam value is set to 0xFFFFFFDA, just as it would be for bus 0.   
And if a SCSI ID is shared by devices on each bus, selecting the  
external one in Startup Disk beeps and sets the XPRam value to  
0x00000000.

Solution:  Pretend it's all one bus and give everything a unique SCSI  
ID.  Or, just don't 'upstage' the boot disks (with a device of the  
same ID on a lower-numbered bus).

(Bad news if you were hoping to have eight or more different startup  
disks...)

Josh