Re: TPM2 on AMD Rizen (fTPM)
- In reply to: Andrea Cocito : "Re: TPM2 on AMD Rizen (fTPM)"
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Date: Sun, 04 Feb 2024 15:13:33 UTC
Hi, Given the commit history I don't think it's supported yet. https://cgit.freebsd.org/src/log/sys/dev/tpm Best regards, Daniel On 2024-02-04T14:43:03.000+01:00, Andrea Cocito <andrea@cocito.eu> wrote: > Hello again, > > First thing: apologies for my email client messing up with charset encoding, hope is fixed now. > > Second, I add some detail/information. > > The machine is a bare metal on Hetzner, I do not have many details, it’s an AMD Ryzen 9 3900 12-Core/24-Threads toy with some motherboard using American Megatrends firmware; unfortunately I have very limited access to the console (one hour upon request…). > > As said the “fTPM” has been enabled in the firmare, and I also tried all the possible combinations of the settings in the firmware which could seem anyhow pertinent (SCM etc). > > The kernel is a custom-built one, simply stripped down to include statically all used devices/modules and drop the rest, compiled with -march=native as all the userland; no problem in rebooting with the GENERIC kernel, but I cannot imagine how it could help. > > Should any additional information be useful to give me some advice just ask, the machine is there to experiment. > > Thanks for any advice, > > A. > >> On 3 Feb 2024, at 18:21, Andrea Cocito <andrea@cocito.eu> wrote: >> >> Hi, >> >> I’m trying to enable TPM support on a box in order to >> experiment a bit with it, but the driver does not seem to load >> and/or see the device. >> >> In the firmware the “fTPM” option has been enabled, tried >> both with SCM enabled and disabled, basically I tried all the >> possible firmware options combinations with no success. >> >> I have tpm_load=“YES” in /boot/loader.conf and also tried the >> hints suggested by the man page is /boot/device.hints >> >> No way to have the tpm? device(s) appear, the best I achieved so >> far on dmesg in a verbose boot is: >> >> … >> >> Preloaded elf obj module "/boot/kernel.old/geom_mirror.ko" at >> 0xffffffff8196d8c0. >> >> Preloaded elf obj module "/boot/kernel.old/tpm.ko" at >> 0xffffffff8196dfb0. >> >> … >> >> tpm0 failed to probe at iomem >> 0xfffffffffed40000-0xfffffffffed44fff on isa0 >> >> tpm1 failed to probe at iomem >> 0xfffffffffed40000-0xfffffffffed40fff on isa0 >> >> … >> >> I am all but an expert about TPM architecture (this is why I am >> willing to play with it), but as far as I understand AMD’s fTPM >> is a TPM2 built into the CPU, I have no idea on which bus it >> should be seen and how. >> >> So my questions are: >> >> - Is AMD’s fTPM supported at all by the driver? >> >> - Am I missing something very obvious? >> >> I have been digging around for information quite a bit, but there >> does not seem to be much information around. Hope I am hitting the >> correct list (accept my apologies if it is not). >> >> Thanks in advance for any advice.