U-Boot support for wolfTPM and firmware update for SLB9672/SLB9673

[Ilias Apalodimas]

Hi David,

On Wed, 21 May 2025 at 20:12, David Garske <david at wolfssl.com> wrote:
>
> Hi Ilias,
>
> Thank you! It’s a pleasure to meet you! I’m the author and maintainer or wolfTPM.
>
> Perhaps it would be useful to meet and chat for a bit? Are you free next week May 28th at 7:30 AM PT?
>
> I loved the feedback from Simon Glass and we will be implementing those and suggesting a new patch soon.

I am a bit overloaded. Is there anything specific you would like to discuss?

Thanks
/Ilias
>
> Thanks,
> David Garske
> Software Engineer, wolfSSL
> +1 (530) 409-2990
> https://www.wolfssl.com
> https://github.com/wolfssl
>
> On May 19, 2025, at 1:52 AM, Ilias Apalodimas <ilias.apalodimas at linaro.org> wrote:
>
> On Fri, 9 May 2025 at 18:43, David Garske <david at wolfssl.com> wrote:
>
>
> Hi Ilias,
>
> Thank you for the quick reply. I am happy that you will consider wolfTPM as a submodule. We have 100’s of commercial customers and it is very actively maintained. In fact we will continue to provide direct maintenance for any u-boot issues that come up using wolfTPM. Also we’ve done safety critical DO-178 certification on wolfTPM.
>
> 1) U-Boot subsystem maintainers. Can you point me to that list of maintainers?
>
>
> it's in MAINTAINERS. I am responsible for TPM
>
> 2) Size: I haven’t run any size comparisons but I expect to be inline with existing code. I will make sure we run some comparisons.
> 3) Releases: Yes we have stable releases done each quarter. I am about to do a release v3.9.0 next week that includes the U-boot support, so I will update the submodule to use the tagged release when it’s ready.
> 4) CVE: Yes we track and create CVE’s if we find issues or any are reported. We typically have a fix posted within 36 hours of a report. Vulnerabilities are published in the release notes and for our premium support customers they get early notification.
> 5) Patch Size: I will work on reducing the changes and splitting them into logical commits.
>
> Enjoy your time away. I’ll have updates to share soon.
>
>
> Thanks
> /Ilias
>
>
> Thanks,
> David Garske
> Software Engineer, wolfSSL
> +1 (530) 409-2990
> https://www.wolfssl.com
> https://github.com/wolfssl
>
> On May 9, 2025, at 5:22 AM, Ilias Apalodimas <ilias.apalodimas at linaro.org> wrote:
>
> Hi David
>
> Hi Denx,
>
> We at wolfSSL have developed a port for wolfTPM in U-Boot. The patch allows using the current built-in TPM 2.0 support or switching to wolfTPM via CONFIG_TPM_WOLF=y. It also supports TPM 2.0 firmware update for the Infineon SLB9672 and SLB9673.
>
> I think there is probably some more cleanup and testing needed, but I wanted to submit this to start the discussion and see your thoughts.
>
>
> It's easier if you CC the appropriate maintainers for each subsystem next
> time!
>
>
> The wolfTPM library is GPLv2 and added as a submodule. If the license or submodule is an issue let’s discuss! I’m positive we can resolve anything.
>
>
> We recently added a few external libraries. mbedTLS and lwIP. Both of these
> are pulled as subtrees, so I'd like to stick to that.
>
> I briefly went through the patch and I don't disagree in pulling an
> external library as long as it's reasonably stable and will continue
> to be maintained. A few questions since I am not familiar with wolfTPM
>
> - Have you made any size comparisons wrt to the final binary size?
> - Does wolfTPM have stable releases that we can use?
> - Is there a CVE policy ?
>
> The current patch is quite big and I honestly don't have time to go
> through all of it in detail. I'll be away next week, but I can give some
> general feedback in ~10days. The easiest thing to do is try to split it
> a reasonable amount of patches -- and only include the bare minimum of what's
> required to work.
>
> Thanks
> /Ilias
>
>
> Attached is the patch based on latest master 3b6760ddeb4 to review.
>
> 
>
> Thanks,
> David Garske
> Software Engineer, wolfSSL
> +1 (530) 409-2990
> https://www.wolfssl.com <https://www.wolfssl.com/>
> https://github.com/wolfssl
>
>
>
>