Re: xorg for alpha

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

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Hello,

On Jan 13, 2009, at 6:19 PM, Manuel Bouyer wrote:

> On Tue, Jan 13, 2009 at 03:10:34PM +0100, Manuel Bouyer wrote:
> > [...]
> > With a TGA 3d30 adapter, the server just do nothing, and the gray  
> > X11 screnn
> > doesn't appear. The tga driver prints suspicious values to the xorg  
> > log
> > (all 0xff) which I assumes it gets from the adapter's registers, so  
> > it's
> > possible reading adapter registers don't always works the way it  
> > should.
>
> playing more with the MGA driver and enabling debug, I can confirm
> that xf86ReadMmio8 always return 0xff. So it looks like the memory  
> mapped
> by xf86 isn't in the card's registers or memory. indeed it's using a
> strange value:
> (II) memory base = 0xa7a486b7525203d
>
> Any idea still welcome ...

(II) memory base = 0x2074657366666f20
(II) memory base = 0x2074657366666f20

These look bogus too.
I don't think Xorg's alpha-specific PCI support code works right on  
NetBSD - I think you should do as sparc64 and the powerpc ports do -  
use netbsdPci.c / ppc_video.c and mmap PCI resources through /dev/ 
ttyE0 at offset == bus address. Much less hassle. If you need PIO  
access define PCI_MAGIC_IO_RANGE to something never used by PCI memory  
resources, the necessary voodoo is already in place in vga_pci.c.
This of course assumes that alpha, like sparc and powerpc, accesses  
PCI IO space through some special memory range. If that's not the case  
please ignore the bit about PCI_MAGIC_IO_RANGE.
For mga you won't need PIO anyway.

have fun
Michael

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