RE: [PATCH/RFC] ARM: dts: rza2mevb: Upstream Linux requires SDRAM

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Hi Geert and Nicolas,

On Fri, May 8, 2020, Geert Uytterhoeven wrote:
> Do you have any guidance how to implement that?
> So far our tries have failed.

Ahh....A nice history of my failed attempts    :o

The big argument was always that "XIP cannot be multi-platform by 
definition because RAM/ROM always resides at different addresses in different 
devices". And as you know, the physical address for RAM and ROM have to 
be hard coded in the kernel binary.

At an ELC a while back, I talked to Arnd and his suggestion was to put 
the base addresses for RAM and ROM at a fixed location in the kernel 
binary. Then for each SoC, you manually modify those values in the each 
binary to match your board. This means there is 'technically' a single build
that will support all boards.

I admit, while it sounded reasonable, I never tried it. Mostly because 
it seemed like a lot of work just to send a patch that might get 
instantly NAK-ed.


Chris




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