DT overlay support

[ludiazv]

Experimental feature to include DT overlays and custom boot args

Usage and implementation details are documented in the README

[nandra]

@ludiazv Thanks for this. I need to sit and read it properly, but no time now. Maybe next week. Thanks again.

[ludiazv]

No worries. Let me know if you have any doubt about the implementation.

[nandra]

@ludiazv It took a while :) but in general I'm OK with approach. Few comments:

• I would rename sunxienv to something more descriptive
• other thing would be to push overlays to separate repo and fetch during building (I don't want to have meta-sunxi changed all the time when someone need update of dtbo)

I'm open for discussion ;). Thanks.

[ludiazv]

Hi @nandra,

@ludiazv It took a while :) but in general I'm OK with approach. Few comments:

• I would rename sunxienv to something more descriptive

I see no problem on that. something like boot.txtcould be fine. Other option is to set a bitbake variable that can be changed by the user of the layer with a weak default vaule. e.g. SUNXI_BOOT_FILENAME ?= "boot.txt"

• other thing would be to push overlays to separate repo and fetch during building (I don't want to have meta-sunxi changed all the time when someone need update of dtbo)

I'm agree, is much more versatile having two repositories and change recipe to fetch the files from there. Are you able to create a repo under linux-sunxi? If that the case I think you can be eassyly port the example files I included as a proof or concept.

I'm open for discussion ;). Thanks.

[nandra]

@ludiazv got response from Paul (one of the repo maintainers) that best would be to post overlays to mainline e.g.: https://patchwork.kernel.org/project/linux-media/patch/20220924152820.77149-8-paul.kocialkowski@bootlin.com/

Can you do it or should I? Thanks.

[ludiazv]

If that's possible it would be better. I don't know how to do it. :(