[PATCH] lmb: Reinstate access to memory above ram_top

[Marek Vasut]

On 5/30/26 4:06 PM, Tom Rini wrote:

>> The revert is wrong as that breaks other things , like use of DRAM above 4
>> GiB boundary, which is exactly why this change was implemented. If RPi has
>> limitations, then those limitations should be imposed on RPi, not globally,
>> so add the LMB reservations on RPi.
> 
> Isn't the case you describe still a theoretical and not used in tree
> case?

No, this is used by the Sparrow Hawk board, which depends on it.

> And note that Ilias' patches to relocate to the top of memory also
> fail on Pi. So there's something to be debugged here and worked out
> before we add this seemingly enhanced behavior. Hence, the need to
> revert it for now until it can be fixed.
We still have two RCs to go, so I don't see the need for a hasty revert 
that breaks other systems, esp. if Ilias is looking into the RPi 
situation now, and I already offered a way to fix the RPi in the short 
term without breaking the other systems.