Messages in this thread | | | Subject | Re: MSI B350M MORTAR: `AMD-Vi: Unable to write to IOMMU perf counter.` and `pci 0000:00:00.2: can't derive routing for PCI INT A` | From | Paul Menzel <> | Date | Fri, 27 Jul 2018 11:18:56 +0200 |
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Dear Jörg,
On 07/27/18 10:27, Jörg Rödel wrote:
> On Mon, Jul 23, 2018 at 12:09:37PM +0200, Paul Menzel wrote: >>> or the BIOS did not enable the performance counter feature in the IOMMU >>> hardware. >> >> Is it possible to check that from the OS side? > > It would be if we had the NB documentation, but I guess those details > are not publicly available.
On the AMD site [1] I see the three family 0x17 documents below.
1. Open-Source Register Reference for AMD Family 17h Processors (PUB) 2. Processor Programming Reference (PPR) for AMD Family 17h Models 00h-0Fh Processors (PUB) 3. Software Optimization Guide for AMD Family 17h Processors (PUB)
What documented is required? The BKDG?
>>> Are you running on the latest BIOS? >> >> Yes, I am even using a “beta“ one from [1]. >> >> DMI: MSI MS-7A37/B350M MORTAR (MS-7A37), BIOS 1.G1 05/17/2018 > > I think the best you can do is to report this as a bug to your BIOS > vendor and hope they'll fix it.
I contacted them with the problem description. Let’s see what the result will be.
Kind regards,
Paul
[1]: https://developer.amd.com/resources/developer-guides-manuals/
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