Re: dual head r128

Kostas Gewrgiou wrote:

On Thu, 12 Oct 2000, Michel [iso-8859-1] Dänzer wrote:

quoted

Kostas Gewrgiou wrote:

quoted

Kevin Hendricks patches from Ani's tree will fix the memory/clock values
for OF cards only, the patch breaks the calculations for the x86 cards
(thats the reason why its not in the xfree cvs),

But there is an #ifdef _powerpc_ so it can't break x86 machines?

Yes but it *does* break x86 cards used in ppc machines.
(linux/ppc isn't the only ppc os supported in xfree and they won't
be happy if we break things for them)

And the int10 or whatever code works for them?

quoted

quoted

The current test only checks if a rom is present not if a bios or OF
segment is there, it needs to be fixed to check that its really reading
from a bios rom and not from something else (OF).

So this code from the current X CVS:

    R128ReadBIOS(0x0000, info->VBIOS, R128_VBIOS_SIZE);
    if (info->VBIOS[0] != 0x55 || info->VBIOS[1] != 0xaa) {
        xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
                   "Video BIOS not detected in PCI space!\n");

only checks if there is a ROM, not if it's a BIOS?

Right, from the pci spec the table is something like this
Offset    Length    Value    Description
0h          1        55h    ROM Signature, byte 1
1h          1        AAh    ROM Signature, byte 2
...
18h-19h     2        xx     Pointer to PCI Data Structure

PCI Data Structure
Offset    Length  Description
...
14           1    Code Type
..

Code Type is 0 for bios and 1 for OF

So you'll have to add one more test to check for BIOS/OF

And then set info->VBIOS = NULL for OF and change the #ifdef _powerpc_ to if
(!info->VBIOS) or similar?


I have my last exam for this year tomorrow and leave for two weeks of vacation
on Saturday, so I wish good luck to any takers :)


Michel


--
Earthling Michel Dänzer (MrCooper)  \  CS student and free software enthusiast
Debian GNU/Linux (powerpc,i386) user \   member of XFree86 and The DRI Project

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