[PATCH v2] ARM: dts: rza2mevb: Upstream Linux requires SDRAM

[Chris Brandt]

Hi Geert,

On Thu, Mar 4, 2021, Geert Uytterhoeven wrote:
> As upstream Linux does not support XIP (eXecute-In-Place) for ARMv7-A
> platforms that are part of the ARCH_MULTIPLATFORM framework, it cannot
> run in the 8 MiB of HyperRAM present on the RZ/A2M CPU board.  Hence the
> 64 MiB of SDRAM on the sub-board needs to be enabled, which has the
> following ramifications:
>   - SCIF4 connected to the on-board USB-serial can no longer be used as
>     the serial console,
>   - Instead, SCIF2 is used as the serial console, by connecting a 3.3V
>     TTL USB-to-Serial adapter to the CMOS camera connector,
>   - The first Ethernet channel can no longer be used,
>   - USB Channel 1 loses the overcurrent input signal.
> 
> Based on the Linux-4.19 BSP for RZ/A2.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas at glider.be>
> ---
> I'm happy to queue this in renesas-devel for v5.13, now commit
> 0673cb3895121506 ("ARM: 9045/1: uncompress: Validate start of physical
> memory against passed DTB") has entered v5.12-rc1, after 2 years of
> development.

Acked-by: Chris Brandt <chris.brandt at renesas.com>


Nice job on reading physical memory start from DT instead of 
hardcoded/guessing in kernel startup.
I think that is great!


Cheers
Chris