[U-Boot] [PATCH 1/3] common: board: support systems with where RAM ends beyond 4GB

[Stephen Warren]

On 12/23/2014 10:34 AM, Stephen Warren wrote:
> From: Stephen Warren <swarren at nvidia.com>
>
> Some systems have so much RAM that the end of RAM is beyond 4GB. An
> example would be a Tegra124 system (where RAM starts at 2GB physical)
> that has more than 2GB of RAM.
>
> In this case, we can gd->ram_size to represent the actual RAM size, so
> that the actual RAM size is passed to the OS. This is useful if the OS
> implements LPAE, and can actually use the "extra" RAM.
>
> However, U-Boot does not implement LPAE and so must deal with 32-bit
> physical addresses. To this end, we enhance board_get_usable_ram_top() to
> detect the "over-sized" case, and limit the relocation addres so that it
> fits into 32-bits of physical address space.

TomW, TomR, does this series look good?