AMD 5600G iGPU passthrough

[kprime17]

Hello
After spending 2 whole days trying to get my iGPU to work in a Debian 11 VM, I'm about to give up, you're my last hope!
I have a Ryzen 5600G on an ASUS B550 Prime Plus.
I tried many manipulations including:

• https://forum.proxmox.com/threads/p...x-ve-8-installation-and-configuration.130218/
• https://forum.proxmox.com/threads/a...missing-amdgpu-fatal-error.134739/post-595453
• https://github.com/isc30/ryzen-gpu-passthrough-proxmox
• find a compatible vbios (because I didn't manage to dump mine)
• use SeaBios or OVMF

nothing works, I either get an error message like this one if I don't specify the vbios

[    2.075924] [drm] amdgpu kernel modesetting enabled.
[    2.076012] amdgpu: Topology: Add CPU node
[    2.076680] amdgpu 0000:00:11.0: amdgpu: Trusted Memory Zone (TMZ) feature disabled as experimental (default)
[    2.083852] amdgpu 0000:00:11.0: BAR 6: can't assign [??? 0x00000000 flags 0x20000000] (bogus alignment)
[    2.089374] [drm:amdgpu_get_bios [amdgpu]] *ERROR* Unable to locate a BIOS ROM
[    2.089394] amdgpu 0000:00:11.0: amdgpu: Fatal error during GPU init
[    2.091995] amdgpu 0000:00:11.0: amdgpu: amdgpu: finishing device.

And if I add in my conf a bios that seems compatible to me like this:
hostpci1: mapping=AMD-Vega-GPU,romfile=CezanneGenericVbios.bin

I have these error messages :

[    2.168917] amdgpu 0000:00:11.0: amdgpu: Will use PSP to load VCN firmware
[    3.293371] [drm:psp_hw_start [amdgpu]] *ERROR* PSP create ring failed!
[    3.293437] [drm:psp_hw_init [amdgpu]] *ERROR* PSP firmware loading failed
[    3.293492] [drm:amdgpu_device_fw_loading [amdgpu]] *ERROR* hw_init of IP block <psp> failed -22

I specify that I am on Proxmox 8.
(I made a VM under Debian 11 because I need to run frigate with a Coral in PCI and since proxmox 8, although I have followed many tutorials with the history of kernel headers, I can't get the coral to work on a debian 12)

I hope someone will be able to help me