What the fastest possible x64 emulation way of OS4 today ?

Tried the HD4850 again with passing through both devices in the IOMMU group and now the error is similar to the RX560.

When you passthrough a GFX for windows in QEMU, you must also pass the gfx card bios rom for initialisation. Not sure if this is also necesary for OS4 emulation.

In both cases there is an error in the x86 emulator while executing the gfx card ROM.

AFAIK the OS4 gfx card drivers themselves don't need nor use the gfx card BIOS, but they can only work after the x86 emulator in the firmware (U-Boot, CFE or SmartFirmware) has executed the gfx card BIOS initialising the card.

I've been following that thread but I don't know much about this topic.
The user terminills said it worked but did not give enough details on what
actually was tested: which graphics card and which guest OS so I'd ask for
more info from there.

As for the errors in the last posts these come from the pegasos2 firmware
BIOS emulator trying to ran the card ROM. This BIOS support of the
pegasos2 firmware also crashes on the QEMU vgabios so it seems to be picky
about what it can run and probably only supports older cards from the era
this firmware and pegasos2 is from. It might also be a problem with using
PCIe cards on pegasos2 which only had PCI and AGP so I don't know if
passing through a PCIe card would work. The best chance would be trying a
PCI ATI card but maybe those are rare. The sam460ex should have PCIe but
I'm not sure it's emulated enough to get a card working with it so this
would need to be tried by somebody who can debug it more.

I don't know if the AmigaOS driver need the BIOS to init the card but if
not it might work with just disabling the BIOS so the board firmware is
not crashing on it. Not sure how to do that but maybe adding rombar=0 to
the -device vfio part might help.

Or maybe just ignoring the errors and trying to boot anyway might work.
When you use -device ati-vga without romfile="" then it will print similar
errors and the window stays black but it actually works, e.g.:

$ qemu-system-ppc -M pegasos2 -bios pegasos2.rom -device ati-vga -cdrom morphos-3.18.iso -serial stdio
[...]
channel 1 unit 0 : atapi | QEMU DVD-ROM | 2.5+
ATA device not present or not responding
INTERNAL ERROR: 0000000E=UNIMPLEMENTED EXTENDED OPCODE

EAX=0000 EBX=0000 ECX=2222 EDX=3333 ESP=0000 EBP=0000 ESI=6666 EDI=0000
AX=FF55 BX=FFAA CX=2222 DX=3333 SP=FF82 BP=FF9E SI=6666 DI=0000
DS=1000 ES=BAD0 SS=1000 CS=C000 IP=2E23 NV UP -- PL NZ NA PE NC
CS:IP = 0F
STACK: 0000 0000 0000 0000 0000 0000 0000 0000
[...]
30: FE4C F000 FE4D F000 FE4E F000 FE4F F000 MISC: UNHANDLED 32 BIT DATA
PREFIX
AT CS:IP = 0000C000:00002E22 0F
INTERNAL ERROR: 0000000A=UNHANDLED 32BIT PREFIX

EAX=0000 EBX=0000 ECX=2222 EDX=3333 ESP=0000 EBP=0000 ESI=6666 EDI=0000
AX=FF55 BX=FFAA CX=2222 DX=3333 SP=FF82 BP=FF9E SI=6666 DI=0000
DS=1000 ES=BAD0 SS=1000 CS=C000 IP=2E23 NV UP -- PL NZ NA PE NC
CS:IP = 0F
STACK: 0000 0000 0000 0000 0000 0000 0000 0000
[..]
Failed to emulate CS:IP [C000:2E22]=66,0F,BE,C0,E9,AD
UNHANDLED INT 10 FUNCTION 0100 WITHIN EMULATION
EA: BYTE READ FROM UNINITIALIZED LOW MEM 0040:0085
UNHANDLED INT 10 FUNCTION 0300 WITHIN EMULATION
[...]
UNHANDLED INT 10 FUNCTION 1301 WITHIN EMULATION
entering main read/eval loop...
UNHANDLED INT 10 FUNCTION 0300 WITHIN EMULATION
UNHANDLED INT 10 FUNCTION 1301 WITHIN EMULATION

When you type "boot cd boot.img" in the QEMU window or the terminal window
(which will not display it just some more errors will be shown) then it
boots and the MorophOS driver eventually detects and inits the card. What
happens is that the firmware detects there is a graphics card so it
redirects output to screen and input to keyboard instead of using serial
like when no graphics card is detected but then it fails to run the card
ROM so you can't see the output. But if the OS driver can init the card
itself then this may not be a problem.

Hans wrote:@all
There's a good chance that the older atiradeon.chip driver also needs to read from the ROM. Obtaining a copy of the ROM after the firmware has read it can be tricky. Radeon cards tend to need a bunch of registers to be set to a particular state for it to be readable.

I'm not sure if I understood correctly, but if we had a radeon rom that would initialize the atiradeon.chip could you use it with Qemu as an emulated graphics card?

joerg wrote:@Maijestro
Quote:

I'm not sure if I understood correctly, but if we had a radeon rom that would initialize the atiradeon.chip could you use it with Qemu as an emulated graphics card?

QEmu doesn't seem to include any Radeon emulation. The only gfx card supported by both QEmu and AmigaOS 4.x seems to be the Cirrus Logic GD5446 (Picasso IV), but I don't know if the AmigaOS 4.x Picasso IV gfx driver supports PCI as well, or if it's limited to Zorro III.