Re: cg14 vesa (modes) project on github

[Andrew Randrianasulu <randrianasulu%gmail.com@localhost>]

On Wed, Jan 7, 2026 at 8:00 PM Andrew Randrianasulu
<randrianasulu%gmail.com@localhost> 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