From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Warren <swarren@wwwdotorg.org>
Date: Tue, 03 Jul 2012 20:27:49 -0600
Subject: [U-Boot] [PATCH 08/12] ARM: rpi_b: drop RAM size to 128M
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On 07/03/2012 08:09 PM, Naren (Narendra) Sankar wrote:
> This should not be hard-coded.
> 
> The current board has 256MB but still allows the VC to use different RAM configuration splits. So the u-boot/Linux partition can get more than 128MB.

While that's true, I believe there's currently no runtime API available
to retrieve the memory split information. When such an API is available,
we can remove the hard-coded limit and use the API instead.

Such an API has been requested; see:
https://github.com/raspberrypi/firmware/issues/47

> And it is possible to support up to 1GB of DRAM on this platform.

The hard-coding is in a location specific to the Raspberry-Pi model B.
So, it doesn't impose any restrictions on any other boards using the
same SoC. While the BCM2835 SoC may allow more memory, the RPi B
specifically only supports exactly 256MB.