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

[Tom Warren]

I've merged that patch series w/u-boot-tegra/next and /master, done a MAKEALL -s tegra, and rebased against ARM /master and pushed to denx.de.

Stephen - please test and if it looks OK, I'll prepare a PR.

> -----Original Message-----
> From: Tom Warren
> Sent: Tuesday, January 20, 2015 8:28 AM
> To: 'Stephen Warren'; u-boot at lists.denx.de; Simon Glass; Stephen Warren
> Cc: Tom Rini
> Subject: RE: [U-Boot] [PATCH 1/3] common: board: support systems with
> where RAM ends beyond 4GB
> 
> 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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