[coreboot] SVN Coreboot-v3 with SVN OpenBIOS payload panics on boot with qemu

[Myles Watson]

> -----Original Message-----
> From: Mark Cave-Ayland [mailto:mark.cave-ayland at siriusit.co.uk]
> Sent: Tuesday, January 27, 2009 4:43 PM
> To: Myles Watson
> Cc: coreboot at coreboot.org
> Subject: Re: [coreboot] SVN Coreboot-v3 with SVN OpenBIOS payload panics
> on boot with qemu
> 
> Myles Watson wrote:
> 
> > Can you enable more debugging and/or figure out what is being accessed
> > at the failure?  I'll help from the coreboot side if I can.
> >
> > Thanks,
> > Myles
> 
> Hi Myles,
> 
> I have some good news; I eventually found SVN revisions of OpenBIOS and
> coreboot-v3 that worked, and found out through SVN bisection that it was
> actually a change in OpenBIOS that caused the crash. The offending
> commit appears to be r416 in the OpenBIOS codebase here:
> 
> http://tracker.coreboot.org/trac/openbios/changeset?old=416%40openbios-
> devel&new=415%40openbios-devel
> 
> Does that help you at all?

It definitely narrows it down.  I'll have to look more closely at the IO
space allocation differences between v2 and v3.

I may have changed the IO allocation from 0x400 to 0x1000 in qemu.  In v3 I
wanted them to all start at the same place.  In v2 it was dependent on the
board.

It looks like OpenBIOS is allocating address space for the devices and
didn't want to allocate in the legacy PCI range.  I just don't see why that
breaks anything unless they're running out of space somehow.  I wonder what
arch->io_base is before they add 0x400 to it.

Have you also asked about this change on the OpenBIOS list?

Thanks,
Myles