[U-Boot] [PATCH] ARM: defconfig: add unified config for RPi3 and RPi4

[Matthias Brugger]

On 06/11/2019 19:06, Heinrich Schuchardt wrote:
> On 11/6/19 3:41 PM, matthias.bgg at kernel.org wrote:
>> From: Matthias Brugger <mbrugger at suse.com>
>>
>> Provide a defconfig which allows us to boot Raspberrry Pi 4
>> and Raspberry Pi 3 Model B/B+
>> Instead of using the embedded DTB as done in RPi3 we use the
>> devicetree provided by the firmware.
> 
> How different are the DTBs provided by different firmware releases?
> 
> Could we run into problems because some elder or newer firmware releases
> are not supported by U-Boot? - This prospect is what makes your patch a
> bit scary to me.
That could happen, but I suppose especially for older releases. Newer releases
tend to change in the direction of upstream.

> 
> Which different firmware releases did you test against?
> 
> Do you plan to keep the existing defconfigs and dtbs?
> 

I didn't do any extensive testing to be honest. We are using the DTB from the
firmware on RPi4 already, and I expect that newer firmwares won't break U-Boot.

My idea is to keep the existing defconfigs. Apart from being a good fallback
option if really something breaks, there might be some distros use U-Boot with
this config files and I don't want to break the setup for them.

Regards,
Matthias