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From: Stephen Warren <swarren@wwwdotorg.org>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 1/3] common: board: support systems with where RAM ends beyond 4GB
Date: Mon, 19 Jan 2015 15:57:24 -0700	[thread overview]
Message-ID: <54BD8BD4.2030908@wwwdotorg.org> (raw)
In-Reply-To: <1419356091-13121-1-git-send-email-swarren@wwwdotorg.org>

On 12/23/2014 10:34 AM, Stephen Warren wrote:
> From: Stephen Warren <swarren@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?

  parent reply	other threads:[~2015-01-19 22:57 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-12-23 17:34 [U-Boot] [PATCH 1/3] common: board: support systems with where RAM ends beyond 4GB Stephen Warren
2014-12-23 17:34 ` [U-Boot] [PATCH 2/3] ARM: tegra: fix variable naming in query_sdram_size() Stephen Warren
2014-12-23 20:02   ` Simon Glass
2014-12-23 17:34 ` [U-Boot] [PATCH 3/3] ARM: tegra: support large RAM sizes Stephen Warren
2014-12-23 20:05   ` Simon Glass
2014-12-23 20:34     ` Stephen Warren
2014-12-23 22:18       ` Simon Glass
2014-12-23 20:01 ` [U-Boot] [PATCH 1/3] common: board: support systems with where RAM ends beyond 4GB Simon Glass
2014-12-23 20:22   ` Stephen Warren
2014-12-23 20:26     ` Simon Glass
2015-01-19 22:57 ` Stephen Warren [this message]
2015-01-20 15:28   ` Tom Warren
2015-01-20 15:56   ` Tom Warren
2015-01-22 18:06     ` Stephen Warren

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