[PATCH] Revert "lmb: Reinstate access to memory above ram_top"

[Marek Vasut]

On 5/29/26 6:29 PM, Peter Robinson wrote:
> This reverts commit a3075db94d49f415658bf7e961e1eae90d9abc33.
> 
> This causes boot issues on Raspberry Pi 4/5 in a number of ways,
> the mmc needs memory < 4Gb, the mailbox needs it < 1Gb at the
> very least so there's some work to be done here for that platform.
> 
> Signed-off-by: Peter Robinson <pbrobinson at gmail.com>
NAK

The revert is wrong as that breaks other things, like use of DRAM above 
4 GiB boundary, which is exactly why the original change was implemented.

If RPi has limitations, then those limitations should be imposed on RPi, 
not globally. Please add the LMB reservations on RPi only. Use 
lmb_arch_add_memory() to add those restrictions per-board/soc/arch instead.