On Wed, 27 Sep 2000, Kostas Gewrgiou wrote:

On Wed, 27 Sep 2000, Geert Uytterhoeven wrote:

quoted

On Tue, 26 Sep 2000, Benjamin Herrenschmidt wrote:

quoted

One thing: I'd be interested in figuring out what happens if you simply
leave this nasty ATI BAR unassigned (write 0xffffffff and then 0 to it).
Will the controller fail ?

Well, according to Matt Porter, 0 is a valid address in PCI 2.2. So how do you
disable BARs for PCI 2.2-compliant devices?

And I'm afraid what XFree86 4.x will do with BARs set to 0. Probably it will
try to relocate them. I guess that's how it crashes on my box with an
unitialized S3...

Yeap unless i am wrong it will try to relocate them, for prep i fear that
without correct BusAddrToHostAddr/HostAddrToBusAddr functions in the xserver
this isn't going to work at all :(

Don't expect it to initialize the S3 card in any case, the int10 module
needs ISA IO/mem accesses and both don't work at the moment for linux/ppc
you can imagine what the following code will do to your machine :(

 #define V_RAM 0xA0000
 INTPriv(pInt)->vRam = xf86MapVidMem(screen,VIDMEM_MMIO,V_RAM,size);

Yes, you have to know the ISA memory base address, which is machine dependent.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds


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