Stephen Warren <swarren@xxxxxxxxxxxxx> 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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