Hacker News new | ask | show | jobs
by vetinari 2765 days ago
It may be a problem with your specific piece.

I'm also using X399 Taichi, it had flashed probably all released non-beta firmware versions except 3.00 and 3.10, with permanently disabled CSM and it had never lost that setting.
1 comments
drewg123 2765 days ago
FWIW, I'm currently running 3.2, and that's all I've ever run. I think there have been a few BIOSes since then, but I have not tried them. This bug is annoying, but manageable (esp. since the box is on a UPS), so I don't want to go through the hassle of an upgrade..
link
washadjeffmad 2765 days ago
There are other benefits to using FW 3.30[1] over 3.2 wrt hardware support and features actually working (ie- IOMMU, PCI reset, ACS, etc).

[1] https://www.asrock.com/MB/AMD/X399%20Taichi/index.asp#BIOS

link
drewg123 2765 days ago
All I see in 3.30 is "Update "MdeModulePkg" module to improve M.2 RAID compatibility." I'd be thrilled if IOMMU support got better, but how can I tell from that? Eg, why do you say IOMMU support will improve? Are there more detailed release notes hidden someplace?

FWIW, I'm typing this on chrome running in a bhyve VM, and I pass a USB controller through via PCI-passthru (using IOMMU) for webcam and U2F dongle use by chrome.. The FreeBSD IOMMU driver whines a bit, but I just assumed that was buggy FreeBSD IOMMU support. Eg: "ivhd0: Error: completion failed tail:0x7e0, head:0x0."

link