Re: drm/mgag200: Fix big-endian support

[Thomas Zimmermann <tzimmermann@suse.de>]

Hi

Am 27.08.26 um 18:38 schrieb Christian Zigotzky:
> On 27/08/26 08:36, Thomas Zimmermann wrote:
>> Hi
>>
>> Am 26.08.26 um 19:30 schrieb Christian Zigotzky:
>>> On 26 August 2026 at 05:23 pm, Thomas Zimmermann 
>>> <tzimmermann@suse.de> wrote:
>>>
>>> Hi
>>>
>>> Could be that we have to enable access to the ROM first. That's why 
>>> it returns only 0xffff. Does the card display output when you switch 
>>> on the computer?
>>>
>>> Best regards
>>> Thomas
>>>
>>> - - -
>>>
>>> Hello Thomas,
>>>
>>> No, the card doesn’t display output when I switch on the computer.
>>
>> Attached you'll find another patch that also enables ROM access in 
>> the PCI config options.  I took the code out of the old matroxfb 
>> driver without further testing. Please try and report back on the 
>> results.
>>
>> Best regards
>> Thomas
>>
>
> Hello Thomas,
>
> Thank you for your effort to solve the problem. Unfortunately, your 
> new patch doesn't solve the problem either. The error outputs are the 
> same as before.

Oh well. I assume it's a ROM for x86?   I guess the PPC firmware doesn't 
POST the graphics card, so the driver has to.  The power-up logic is 
given in Sec 4.3.3 of the MGA200 spec.  But TBH I won't have the time to 
work on it.  At best, I can help a bit if someone wants to address the 
problem.

Best regards
Thomas

>
> Cheers,
> Christian
>

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com
GF: Jochen Jaser, Andrew McDonald, (HRB 36809, AG Nürnberg)