[Request] Fujitsu Futro S920 Thin Client: Enable IOMMU, Fix Reserved VRAM

[Kummi123]

Dear bios-modders,

I am searching for help and/or hints to get IOMMU working on this thin client ( Fujitsu Futro S920 - D3312-A13 3).
The goal is be able to passtrough PCIe ressources and use this little machine as lowpower virtualisation host with proxmox.
The SOC on this motherboard is a AMD GX-415GA which should be able to handle IOMMU for my understanding.

What I have done so far:
- update the board with the latest official bios version ( D3313-A1.rom)
- modifying the sections I found relating to virtualization with AMIBCPv4.55 ( I think mostly SVM mode was realvant here)
- update the board with AFUDOS and check results
- unfortuantely there is still no option to enabel IOMMU
- search for IOMMU relevant strings with AMIBCP with some founds ( only in the strings ) pls see attached pictures.

Thats where I stuck now and kindly want to ask for assistance.
Would it be possible for you to integrate the missing feature to this bios ?
Any hints are also higly welcome.

I have attached the original and modified files and some pictures.
The direct download file link on Fujitsu side is:
https://support.ts.fujitsu.com/IndexDown...49E35203AB

Many thanks in advance and have a nice day,
Peter

[domus_ill]

Hi everyone,

I own a Fujitsu Futro S920
MB: D3313-G13 3
CPU: AMD GX222GC.
Bios: R1.16.0

I wan to achieve the following:
- Enable IOMMU
- Fix reserved VRAM

Apparently IOMMU is not enabled and BIOS provides no option for it.
I can see Kummi123 has been trying to achieve the same (proxmox PCIe passthough).

Reserved VRam settings aren't followed properly.
The system seems to reserve 2GB regardless + the selected amount in BIOS (see attached).

Link to currently installed BIOS V4.6.5.4 - R1.16.0
https://support.ts.fujitsu.com/IndexDown...0982B3BFDA

Let me know if anything else is needed.

Thanks in advance.

[cbbos]

Omg, we had the same difficulty (reserving 4.6GB of RAM for hardware). The difference is that mine is an Intel processor and a UHD600 graphics card.
And there are graphics options in the BIOS, so I'm pretty sure the RAM isn't being eaten up by the graphics card.

[mrdarkenrahl]

Was you able to run it? How does you check if IOMMU is working in Proxmox? Or rather - did configured Proxmox properly, so it will support PCIe passthrough if BIOS will work?

[banuseka]

Did you get anywhere? I am also looking to get IOMMU working to passthrough a NIC on proxmox since the bridges are a bottleneck currently for my needs