[U-Boot] [PATCH 4/4] ARM: tegra210: gpu: configure WPR region

[Stephen Warren]

On 10/28/2015 05:55 PM, Alexandre Courbot wrote:
> 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.

Once L4T for T210 has been released, it'll contain a full set of nvtboot
binaries and flashing support. You an easily acquire this internally
already; send me an email if you need a link. I'd expect a public SW
release by the time any T210 boards capable of running upstream are
available.