RE: [Xen-devel] 'Sloppier' PCI access checks in main tree

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

Stijn,

What kernel are you using? We've all been working on the assumption that
you were using 2.6, but the problem your seeing would be consistent with
using 2.4, which only has support for basic X servers. If you are using
2.4 try disabling the int10/bios/vesa X drivers etc.

[Our /dev/mem under 2.4 doesn't support read/write only mmap.]

Ian

> -----Original Message-----
> From: xen-devel-admin@xxxxxxxxxxxxxxxxxxxxx 
> [mailto:xen-devel-admin@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Keir Fraser
> Sent: 08 January 2005 17:22
> To: Ronald G. Minnich
> Cc: Stijn De Weirdt; xen-devel@xxxxxxxxxxxxxxxxxxxxx
> Subject: [Xen-devel] 'Sloppier' PCI access checks in main tree
> 
> > As I read this, the module loader tried to run the vga bios 
> and failed, as 
> > it could not get to the actual BIOS code? That's how it looks to me 
> > anyway. 
> > 
> > I have no idea: has anyone seen option rom access working 
> under Xen? I 
> > have not, but I have not tried this recently. The VGA bios 
> ROM is not 
> > accessible on my laptop, however. 
> > 
> > Does Xen currently allow a guest to set enable the option 
> rom access and 
> > set the register (0x30 I think) for the option ram base address? 
> 
> I've just checked in sloppoer PCI checking for 2.0-testing and
> unstable trees. It should help for those drivers that need to monkey
> with the base-address config registers (we had previously been
> disallowing that). Really, applying any check finer-grained than
> "should this domain be allowed to access this device?" is hard as
> various drivers need to do all kinds of weird things with the
> config-register space.
> 
> Hopefully this may help you get further in getting AGP to work on your
> system!
> 
>  -- Keir
> 
> 
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