From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Warren <swarren@wwwdotorg.org>
Date: Wed, 28 Oct 2015 11:59:04 -0600
Subject: [U-Boot] [PATCH 4/4] ARM: tegra210: gpu: configure WPR region
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 <1445230624-30314-5-git-send-email-acourbot@nvidia.com>
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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.