Date: Sun, 4 Feb 2024 14:43:03 +0100 From: Andrea Cocito <andrea@cocito.eu> To: freebsd-hackers@freebsd.org Subject: Re: TPM2 on AMD Rizen (fTPM) Message-ID: <71AF606D-1685-43E5-9455-E1882EAECE96@cocito.eu> In-Reply-To: <51A26E14-9374-4B1A-9DA1-A9E2A2B4E2EA@cocito.eu>
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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.help
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