IOMMU Group Issues - USB PCIE / Integrated Bluetooth : AM4 Asrock X370 Taichi

[cablecutter]

Hi All,

 

I'm out of ideas and could use a push on the right direction.

 

I have a new bit of hardware, a Ryzen AM4 build on an Asrock X370 Taichi board.  I am running a windows 10 VM.

 

There are two devices that I would like to pass through (highlighted in the image below):

1. An integrated Wifi Controller with Bluetooth (09:00.0)
2. A PCIE USB controller (0a:00.0)

 

1. 

 

The trouble is that these devices share a n IOMMU grouping with my main NIC (also integrated), which I hear is a no-no.

 

I've tried:

1. Setting ACS Override to Y (results shown)
2. Setting "Iommu Groupings" to 'enabled' in the bios
3. Flipping other rather undocumented switches in the bios that seem to be related to PCIE cards...wish I could remember which ones.

 

What can I try next?

 

Best,

Rob

[cablecutter]

Still stuck on this.  Are there any bios settings I may be overlooking?

[1812]

turn acs ovveride back to off, then modify your syslinux.cfg to this:

 

append pcie_acs_override=id:8086:24fb,1106:34B3 initrd=/bzroot

 

verify these numbers match your device id's (my eyes are not doing so well this evening....)

[cablecutter]

Thanks - gave that a shot for just the via card, but it seems to have had no effect.  

 

default menu.c32
menu title Lime Technology, Inc.
prompt 0
timeout 50
label unRAID OS
  menu default
  kernel /bzimage
  append pcie_acs_override=id:1106:3483 initrd=/bzroot
label unRAID OS GUI Mode
  kernel /bzimage
  append initrd=/bzroot,/bzroot-gui
label unRAID OS Safe Mode (no plugins, no GUI)
  kernel /bzimage
  append initrd=/bzroot unraidsafemode
label Memtest86+
  kernel /memtest