Hi Varun,

TF-A v1.4 is rather old codebase, can you provide the exact patchset you cherry-picked on top of it?

e.g. you need the Hercules CPU support patch (a4668c36f1fca75b), but possibly also all which is related to HW_ASSISTED_COHERENCY option?

Also, can you pls provide your build cmd line?

Thanks & Regards, Olivier.

________________________________ From: TF-A tf-a-bounces@lists.trustedfirmware.org on behalf of Soby Mathew via TF-A tf-a@lists.trustedfirmware.org Sent: 11 October 2019 11:21 To: Varun Wadekar vwadekar@nvidia.com; Joanna Farley Joanna.Farley@arm.com; Matteo Carlini Matteo.Carlini@arm.com Cc: Julius Werner via TF-A tf-a@lists.trustedfirmware.org; nd nd@arm.com Subject: Re: [TF-A] Hercules-AE I$ problems

On 10/10/2019 20:46, Varun Wadekar wrote:

Hello,

First of all, thanks a lot for posting the Hercules-AE patches.

We picked them up and used them internally. Unfortunately, the CPU sees garbage in it's I$ when we enable the I cache for the processor. If we keep I$ disabled, TF-A boots properly. We are using TF-A v1.4 for verification.

We booted Linux kernel v4.14 on the processor and don't see this problem there. So, we suspect something going wrong inside TF-A. Have you seen this problem internally? Any hints or clues to solve it would be helpful.

Thanks.

Hi Varun, As indicated in the commit message of the patch, we have not tested the CPU support internally due to non-availability of FVP for the CPU.

TF-A assumes that I$ will be invalidated when CPU is reset. Perhaps this is not true for your setup. Could you try adding a `IC IALLU` in the CPU reset handler prior to I$ enable and see if that improves anything ?

Best Regards Soby Mathew

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