Hi Okash,

The Cortex-X1 was never a generic licensed CPU with a common MIDR IIUC and was licenced under terms that each partner licensing it had their own MIDR as part of the licensing program (ADP/ELP) and at the time X1 was released TF-A was not supporting such CPU’s in the upstream.

However, with https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/tree/include/lib/cpus/aarch64/cortex_makalu.h we have started supporting in the upstream an ELP licensed CPU’s with their own MIDR such as https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/tree/include/lib/cpus/aarch64/cortex_makalu_elp_arm.h

So I guess if Google have a ADP/ELP licence and want to upstream support with their MIDR?

Using the above headerfiles as a guidance in a suitably named header file containing suitable contents something might be upstreamable?

Joanna

From: Okash Khawaja via TF-A <tf-a@lists.trustedfirmware.org>
Date: Monday, 11 April 2022 at 12:14
To: tf-a@lists.trustedfirmware.org <tf-a@lists.trustedfirmware.org>
Subject: [TF-A] Cortex-X1 support

Hello,

Are there any immediate plans to add support for Cortex-X1 in TF-A? If
not then I'll be happy to submit CL for it. For start, it will cover a
subset of errata workarounds. Then people can add more as needed. Let
me know what you think.

Thanks,
Okash
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