On Wed, Jan 7, 2026 at 9:47 PM Andrew Randrianasulu <randrianasulu%gmail.com@localhost> wrote: > > > > чт, 8 янв. 2026 г., 06:16 Bob Breuer <bbreuer711%gmail.com@localhost>: >> >> On Wed, Jan 7, 2026 at 11:46 AM Andrew Randrianasulu >> <randrianasulu%gmail.com@localhost> wrote: >> > >> > On Wed, Jan 7, 2026 at 8:40 PM Malte Dehling <mdehling%gmail.com@localhost> 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" >> >> As I remember, the Qemu SuperSparc II implementation doesn't support >> one of the features used by the original OBP roms. > > > May be filling qemu-upstream bug about it will help, eventually? > > I noticed that with original ROM -smp switch does not increase about of firmware-counted CPUs ... > >> >> > >> > 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 >> > >> >> I didn't notice that Artyom rebased my cg14 patches. I also have a >> separate branch where I implemented the DBRI audio device. > > > Interesting, is this branch public? Yes, it's here: https://github.com/breuerr/qemu/tree/dbri-pre2 I think the audio output was clean with a Linux client but had popping with a netbsd client. > > >> >> > > >> > > IIRC, qemu has resolutions hard coded in, but I may be wrong about this. >> >> Is there any particular resolution that you are looking for? >> >> The emulated cg14 was flexible enough to handle any resolution that >> could be programmed. However, the startup resolution is limited by >> the monitor ID bits. The cg14_set_monitor_id() function translates >> the Qemu command line resolution to a monitor ID for a nearby OBP >> resolution. In addition to 1152x900, the resolutions of 1280x1024 and >> 1600x1280 should also work by default. > > > In my case I was after not so much resolution per se, but was trying to avoid some strange emulated TCX bugs, I can avoid most of them by running xcompmgr& in NetBSD but something still not 100% correct with cinelerra-gg and mplayer, colors are swapped in video output (plain X11, not xv), so I was hoping to see if emulated cg14 can sidestep this issue > Might be able to try with cg3, that thing had absolutely no acceleration, but it's 8-bit only. Or if you need 24-bit color but the lack of SX is a problem, theoretically the SS10 supported cg14 without SX and it should be possible to hack that into qemu. > >> >> Bob >> >> >> > > >> > > Cheers, >> > > Malte >> > > >> > > >> > > On Wed, Jan 7, 2026, 9:31 AM Andrew Randrianasulu <randrianasulu%gmail.com@localhost> wrote: >> > >> >> > >> 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