Re: [Qemu-ppc] (What happened to the pci_databases.c?) Adding Voodoo2 emulation.

[Jd Lyons]

> On Feb 16, 2017, at 10:45 AM, G 3 <address@hidden> wrote:
> 
> 
> On Feb 16, 2017, at 9:29 AM, address@hidden wrote:
> 
>> Message: 3
>> Date: Thu, 16 Feb 2017 09:28:55 -0500
>> From: Jd Lyons <address@hidden>
>> To: address@hidden
>> Subject: Re: [Qemu-ppc] (What happened to the pci_databases.c?) Adding
>>      Voodoo2 emulation.
>> Message-ID: <address@hidden>
>> Content-Type: text/plain; charset="utf-8"
>> 
>> 
>>> On Feb 16, 2017, at 6:58 AM, Jd Lyons <address@hidden> wrote:
>>> 
>>> 
>>>> On Feb 15, 2017, at 10:16 PM, G 3 <address@hidden> wrote:
>>>> 
>>>> 
>>>> On Feb 15, 2017, at 10:02 PM, address@hidden wrote:
>>>> 
>>>>> Message: 2
>>>>> Date: Wed, 15 Feb 2017 15:03:10 -0500
>>>>> From: Jd Lyons <address@hidden>
>>>>> To: Mark Cave-Ayland <address@hidden>,
>>>>>   address@hidden
>>>>> Subject: Re: [Qemu-ppc] (What happened to the pci_databases.c?) Adding
>>>>>   Voodoo2 emulation.
>>>>> Message-ID: <address@hidden>
>>>>> Content-Type: text/plain; charset=utf-8
>>>>> 
>>>>> 
>>>>>> On Feb 15, 2017, at 2:07 PM, Mark Cave-Ayland <address@hidden> wrote:
>>>>>> 
>>>>>> On 15/02/17 13:32, Jd Lyons wrote:
>>>>>> 
>>>>>>> Hmmmmm??? I think I downloaded it correctly, as a submodule, but I 
>>>>>>> don?t understand how to build it?
>>>>>>> 
>>>>>>> I thought I was building it with the sconce I had downloaded for other 
>>>>>>> site, but now I see, that changes I make to the pci_daatabase.c are 
>>>>>>> having no effect, that?s why I?m ending up with a black screen, no 
>>>>>>> boot, in Open Bios, whenever I try to add a device that isn?t in the 
>>>>>>> pic_databsae.c.
>>>>>> 
>>>>>> No, you'll need to install a ppc cross-compiler (unless you're native
>>>>>> PPC) and use that to build the new binary.
>>>>>> 
>>>>>> There are plenty of tutorials on the web as to how to build a
>>>>>> cross-compiler so I'd suggest getting that set up first; then once
>>>>>> that's done take a look at the OpenBIOS wiki at
>>>>>> https://www.openfirmware.info/OpenBIOS for build instructions.
>>>>>> 
>>>>>> There is also a separate OpenBIOS mailing list which is more on-topic
>>>>>> for OpenBIOS-related discussion so I'd suggest moving the discussions on
>>>>>> setting up the build environment over there.
>>>>>> 
>>>>> 
>>>>> Thanks Mark, I was a little confuse what Cross-complier I needed.
>>>> 
>>>> I was wondering how you plan on implementing the Voodoo2 video card. 
>>>> Reverse engineer a driver? Port already existing voodoo2 emulation code to 
>>>> QEMU? Use documentation on Voodoo2 register layout?
>>>> 
>>>> 
>>> 
>>> I planned on porting the code from Bochs, but it seems heavily dependent on 
>>> a bunch of Bochs specific bx_ calls, bot really modular. I may try the code 
>>> from Dosbox, and see if it?s more modular. Baring that I?ll have to write 
>>> it all from scratch.
>>> 
>> 
>> Does anyone know where the default Display NDRV comes from in Qemu-PPC?
> 
> I think it comes from the pc-bios folder. That is found in the root level of 
> your QEMU folder.
> 
I know that Qemu loads vgabios-stdvga.bin, by default, I changed it to Load the 
Rom from the Voodoo4, when I emulate the Voodoo4, or the Rage128Pro, when I 
emulate that. The Option Rom does load in the correct address for the VGA card, 
but the NDRV from the Option Rom, does not load. I can not find any NDRV in the 
PC-bios folder, and the file vgabios-stdvga.bin, does not appear to contain an 
NDRV, or a PCI Header.

>> 
>> I keep getting an NDRV that is for Non-existant hardware:
>> 
>> 32119270913_c9e5313cf5_b.jpg 
>> <http://farm3.staticflickr.com/2340/32119270913_c9e5313cf5_b.jpg>
>> 
>> 32119268253_4b888357c6_b.jpg 
>> <http://farm4.staticflickr.com/3945/32119268253_4b888357c6_b.jpg>
>> 
>> If I use a version of Qemu, that has been modified to Upload the Qemu,VGA 
>> NDRV, I can change screen resolutions, and bit depth in OS 9/X, but if I 
>> hand Qemu the FCode rom to match the Video device I am emulating, it doesn?t 
>> read the NDRV from the FCode rom, I get this default Non-exsistan hardware 
>> NDRV.
> 
> I think the NDRV doesn't match the Voodoo2 video card. The driver you are 
> probably using is made to only work with QEMU's VGA card. I don't know very 
> much about the Voodoo2 video card, but if it can be used in a VGA mode, then 
> it might be possible to use that NDRV.

The Voodoo2 did not have an option rom, so there is no NDRV, unless it comes 
from the 3DFX extensions. It was not a VGA card, it only supported VGA 
passthrough, with a special cable from whatever VGA card was in your Mac/PC.
>> 
>> Is this coming from Qemu, I.E. is it a file I can change when I build 
>> Qemu/Openbios, or is it the Mac OS that is loading this NDRV?
> 
> It is the Mac OS that reads and loads this file. But I think its possible to 
> use that NDRV in OpenBIOS as well. Just never tried it before.

I’ve tried to extract the NDRV from the Rage128, and the Voodoo4 FCode Rom, but 
when I use them, I get a Kernel Panic in OS X, and the Grey Screen never loads 
for OS 9, I get stuck at the Openbios screen, after it loads \\:tbxi. I must 
not be extracting the NDRV’s correctly, or they are incomparable with the VGA 
that Qemu is emulating.

>> I tried using the FCode rom, and uploading that when I build Qemu, and it 
>> does upload the proper rom to 0x30, and I can dump it with Macsbugs, so I 
>> know it?s the correct file, but even when I boot OS X with the 
>> boot-args=romndrv=1, it doesn?t load the NDRV from the FCode rom.
> 
> For some reason your single quotes appear as question marks. Look at 
> "doesn't”:
I do not know why it does that when I use contractions.

>> when I boot OS X with the boot-args=romndrv=1, it doesn?t load the NDRV

Thanks G3,

JD