CM5 and LetsTrust TPM with u-boot and Linux

[Jonas Kvinge]

Hi,

I'm working on getting Raspberry Pi CM5 with a source kit io board and
LetsTrust TPM with u-boot and Linux working.
I'm building a custom u-boot similar to the description
here: https://github.com/joholl/rpi4-uboot-tpm/blob/ad31306ce2f2d52f0572385bfc8bac33cb1f1f68/README.md#setting-up-and-configuring

I've got this successfully working on the CM4 where the PCR's are
extended on boot.

I'm now trying a similar setup on the CM5.
I use openSUSE Tumbleweed with a custom built u-boot and linux kernel.
I use kernel 6.12.35 with all the Raspberry Pi modifications
from https://github.com/raspberrypi/linux

The TPM is detected, but the PCR's are not extended, showing zeros for
all PCRs (tpm2_pcrread).

In addition to the tpm-slb9670.dtbo from the latest firmware files for
the Raspberry Pi
(https://raw.githubusercontent.com/raspberrypi/linux/refs/heads/rpi-6.12.y/arch/arm/boot/dts/overlays/tpm-slb9670-overlay.dts
), I use the tpm-soft-spi.dts
from https://raw.githubusercontent.com/joholl/rpi4-uboot-tpm/ad31306ce2f2d52f0572385bfc8bac33cb1f1f68/Raspberry_Pi_OS_64bit/tpm-soft-spi.dts

Do these needs to be modified for Raspberry Pi Compute Module 5, or
could it be something in u-boot that needs to be changed?

Jonas