[OpenBIOS] [commit] r832 - in trunk/openbios-devel: arch/sparc32 drivers

Mark Cave-Ayland mark.cave-ayland at siriusit.co.uk
Sat Aug 7 15:28:14 CEST 2010

Blue Swirl wrote:

>> Ah wait a sec - according to the IEEE-1275 spec, the device chosen from
>> boot-device is the first one that can be successfully opened, i.e. returns a
>> valid ihandle with open-dev. Since the cdrom device is first in the list
>> (and can always be successfully opened), it will never try the next option.
>> So what you need to do is swap the order over from "cdrom cdrom:d" to
>> "cdrom:d cdrom" which should give the desired behaviour.
> The problem which prevented NetBSD boot was actually open_ih() return
> value check, fixed in r839. R840 is only cosmetic.

Ah I see. Looks like the return value is different between open_io() and 
open_ih() :(

> I could now change 'cdrom' to point to 'd' partition. One place for
> the change is obviously in openbios.c, but a change there doesn't
> affect the other variant aliases like 'sd(0,2,0)' which should also be
> adjusted. These are added in esp.c.

I think esp.c is probably the right place for the change to be made if 
you're simply wanting "cdrom" to become "sd(0,2,0):d".

> There's also automatic partition selection code in sun-parts.c which
> is a bit ugly. With ':d' appended to 'cdrom', that may actually force
> the selected partition to be the first ('a') partition.
> I think it's better to postpone these changes until multiple boot
> devices can be used in openbios.c.

I'm confused. Surely if the "cdrom" alias is fixed, then once it is 
changed then it doesn't matter anymore as you would specify -boot d on 
the qemu command line? Or do you mean there is something still not right 
with the multiple boot-device code?



Mark Cave-Ayland - Senior Technical Architect
PostgreSQL - PostGIS
Sirius Corporation plc - control through freedom
t: +44 870 608 0063

Sirius Labs: http://www.siriusit.co.uk/labs

More information about the OpenBIOS mailing list