Re: xorg pci probing

[Michael <macallan%netbsd.org@localhost>]

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Hello,

On Jan 18, 2011, at 10:22 AM, Martin Husemann wrote:

> To summarize what goes on: on x86 archs (and AFAICT for NetBSD only  
> there)
> the X starup code enumerates all pci buses the kernel found,  
> searching for
> vga devices. If multiple are found, it prefers the one that the new  
> function
> marks. That's basically all about it.

Yes, the idea ( I think... ) is to make sure screen :0 is what the  
user would expect. As it is now that's not necessarily the case.

> If the new function says "no" to all devices, we have the same state  
> as right
> now. This, however, will not happen, even with serial console, as  
> the function
> realy only finds the first wsdisplay device's parent vga.

Well, I think we can safely assume that people would expect wsdisplay0  
as :0.

> On sane ports we do not enumerate via /dev/pci, but straight open  
> ttyE0 (i.e.
> the first display, the same that the new function will mark) or  
> ttyF0 etc for
> multiple servers, and are there right away.

Actually we do the pci enumeration dance everywhere now, so X can use  
all graphics devices. I would prefer something /dev/fb*-ish too but  
that would require a lot of rototilling - we'd have to attach a dev  
entry to all graphics devices even those we don't have a kernel driver  
for.

> I would prefer to drop the stupid enumeration code on x86 too, but I'm
> definitively not goint to touch that code myself - so no right to  
> complain.

Exactly.

have fun
Michael

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