From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alexandre Courbot <acourbot@nvidia.com>
Date: Thu, 29 Oct 2015 08:55:07 +0900
Subject: [U-Boot] [PATCH 4/4] ARM: tegra210: gpu: configure WPR region
In-Reply-To: <56310CE8.3050107@wwwdotorg.org>
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 <56310CE8.3050107@wwwdotorg.org>
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On 10/29/2015 02:59 AM, Stephen Warren wrote:
> On 10/18/2015 10:57 PM, Alexandre Courbot wrote:
>> T210's GPU secure firmware loading requires a write-protected region
>> to be set up.
>>
>> This patch reserves the upper 256KB of RAM as the WPR region and locks
>> it so the kernel can initiate secure firmware loading.
>
> On T210, it's the responsibility of nvtboot (which runs before U-Boot)
> to set up any and all carve-outs. This code should not be necessary, and
> indeed I expect the registers it touches can't actually be programmed
> from U-Boot, which runs in non-secure mode after WPR is already locked.

Ok, I was running from Thierry's miniloader which did not program or 
lock these registers.

The question then is: do we have an official nvtboot binary available 
for upstream support? AFAICT Thierry's miniloader solution is the only 
solution available to the public, and without this setup one cannot use 
the GPU on T210.