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

[Peter Robinson]

On Sat, 30 May 2026 at 14:27, Marek Vasut <marek.vasut at mailbox.org> wrote:
>
> 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.

Read the thread, Tom asked me to send a revert.

> 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.