On 06/11/2019 19:06, Heinrich Schuchardt wrote:
On 11/6/19 3:41 PM, matthias.bgg@kernel.org wrote:
From: Matthias Brugger mbrugger@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