[U-Boot] [PATCH] ARM: tegra: restrict usable RAM size further

[Thierry Reding <treding@nvidia.com>]

On Wed, Jul 29, 2015 at 01:47:58PM -0600, Stephen Warren wrote:
> From: Stephen Warren <swarren@nvidia.com>
> 
> Additionally, ARM64 devices typically run a secure monitor in EL3 and
> U-Boot in EL2, and set up some secure RAM carve-outs to contain the EL3
> code and data. These carve-outs are located at the top of 32-bit address
> space. Restrict U-Boot's RAM usage to well below the location of those
> carve-outs. Ideally, we would the secure monitor would inform U-Boot of
> exactly which RAM it could use at run-time. However, I'm not sure how to
> do that at present (and even if such a mechanism does exist, it would
> likely not be generic across all forms of secure monitor).

0xe0000000-0xffffffff is 512 MiB, surely a secure monitor can live with
less than that!

Thierry

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