BCM2836 (Raspberry Pi 2) port

Eric Anholt eric at anholt.net
Tue May 12 10:32:53 PDT 2015

Stephen Warren <swarren at wwwdotorg.org> writes:

> On 05/12/2015 09:39 AM, Alexander Stein wrote:
>> On Monday 11 May 2015, 20:36:40 wrote Stephen Warren:
>>> On 05/08/2015 10:14 AM, Alexander Stein wrote:
>>>> On Thursday 23 April 2015, 22:25:08 wrote Stephen Warren:
>>>>>> Hit any key to stop autoboot:  0
>>>>>> U-Boot> setenv fdt_high fffffff
>>>> Any specific reason to set fdt_high to fffffff?
>>> Yes, it prevents U-Boot's annoying habit of moving the DTB from where it
>>> was loaded to some other place. This was especially important in this
>>> case since I was trying to find out exactly which piece of RAM being
>>> over-written caused the issues I was seeing.
>> Shouldn't this then be part of the default raspberry (2 only?) environment?
> Eventually yes. So far, nobody seems to know which areas of RAM are 
> off-limits (presumably since the RAM is used as a CPU1..3 pen), so I was 
> experimenting to try and find that out.

If I'm reading this right, the CPU1-3 pen is in the bottom 8k of memory
(actually much less than 8k).
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