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

[Tom Warren]

Sorry, missed this. Yes, looks good to me. I can apply it to u-boot-tegra/master, or TomR can take it in to master U-Boot directly.

Tom

> -----Original Message-----
> From: Stephen Warren [mailto:swarren at wwwdotorg.org]
> Sent: Monday, January 19, 2015 3:57 PM
> To: u-boot at lists.denx.de; Simon Glass; Tom Warren; Stephen Warren
> Cc: Tom Rini
> Subject: Re: [U-Boot] [PATCH 1/3] common: board: support systems with
> where RAM ends beyond 4GB
> 
> 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?
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