linux-kernel - Re: [PATCH v2 0/5] Initial support of Trusted Foundations on Tegra30

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Date:   Mon, 02 Jul 2018 17:48:36 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Peter Geis <pgwipeout@...il.com>
Cc:     Russell King <linux@...linux.org.uk>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        linux-tegra@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>
Subject: Re: [PATCH v2 0/5] Initial support of Trusted Foundations on Tegra30

On Friday, 29 June 2018 22:37:02 MSK Peter Geis wrote:
> Good Afternoon,
> 
> I have tested these patches on the Ouya T3 device.
> They work great to enable the L2 cache controller, however they do not
> respect explicitly disabling the L2 cache controller via the kernel
> config nor device tree.
> 
> With CONFIG_CACHE_L2X0 disabled, but CONFIG_TRUSTED_FOUNDATIONS enabled,
> the L2 cache controller is silently enabled and allows all four cores to
> boot.
> 

I don't see how cache could be enabled with CONFIG_CACHE_L2X0 disabled, there 
is no code to do that. Could you elaborate please?

Secondary cores do not depend on the cache state, disabled cache shouldn't 
prevent them to boot.

> One must also disable CONFIG_TRUSTED_FOUNDATIONS to stop the L2 cache
> controller from spinning up.
> 
> Tested-by: Peter Geis <pgwipeout@...il.com>
>