Re: cg14 vesa (modes) project on github

On Wed, Jan 7, 2026 at 8:40 PM Malte Dehling <[email protected]> wrote:
>
> Hi Andrew,
>
> I've only tested the prom on physical hardware, and I haven't been able to get qemu to work with an ss20 and original prom recently.  Would love to hear if you make progress on this!

well, for me setting -cpu to something like

"TI SuperSparc 50"

work, at least i see logo and can enter probe-scisi.

Note, this is more like qemu 9.2.50 as Artyom created it 9 months ago,
not really recent qemu git (10.x, 11.x)

https://youtu.be/wCFBvzVCVMk - short vid of whole thing booting

>
> IIRC, qemu has resolutions hard coded in, but I may be wrong about this.
>
> Cheers,
> Malte
>
>
> On Wed, Jan 7, 2026, 9:31 AM Andrew Randrianasulu <[email protected]> wrote:
>>
>> On Wed, Jan 7, 2026 at 8:00 PM Andrew Randrianasulu
>> <[email protected]> wrote:
>> >
>> > Was looking for Sparcstation-20 proms to test with cg14 enabled qemu
>> >
>> > found this project;
>> >
>> > https://github.com/mdehling/cg14-vesa-mod
>> >
>> > https://github.com/artyom-tarasenko/qemu/ - branch cg14
>> > https://github.com/artyom-tarasenko/qemu/commit/1b1d8b87619e613b059766e6e54687b027fb6e3f.diff
>> >
>> > https://github.com/artyom-tarasenko/qemu/commit/b297821755e68381e7753d877a7912bebe9271d8.diff
>> >
>> > but device cg14 not on list so you need to start it like this:
>> >
>> > build/qemu-system-sparc -M SS-20 -g 1152x900
>> > cg14_realizefn 1152, 900
>> >
>> > Of course default openbios does not know how to output to that, so I'm
>> > trying this Sun PROM now ...
>>
>>
>> It tries to boot my NetBSD install but it faults somewhere along the way:
>>
>>  build/qemu-system-sparc -M SS-20 -g 1152x900 -bios
>> ~/Desktop/ss20-2.25.bin  -cpu "TI SuperSparc 50" -hda
>> /mnt/zip/home/guest/QEMU/sparc-netbsd-15g-compressed-r1.qcow2
>> cg14_realizefn 1152, 900
>> CG14: control register (0x5a) has unimplemented bits set
>> CG14: readb from reg 1000
>> CG14: writeb 0x00 to reg 1000
>> CG14: writeb 0x01 to reg 1000
>> CG14: readb from reg 1000
>> CG14: readb from reg 1001
>> CG14: writeb 0x01 to reg d
>> CG14: readl 00000000 from reg 20c
>> CG14: writeb 0x02 to reg 100
>> CG14: readl 00000000 from reg 20c
>> CG14: readb from reg 200b
>> CG14: readb from reg c
>> CG14: writeb 0x00 to reg c
>> CG14: writeb 0x02 to reg 100
>> CG14: readl 00000000 from reg 20c
>> CG14: readb from reg 200b
>> CG14: readb from reg c
>> CG14: writeb 0x00 to reg c
>>
>> https://mastodon.online/@Andrew_R/115854999356998946