dtb overlay?

[avafinger]

dtb overlay?

[avafinger]

Currently, there is no support for dtb overlays. I will try to add support on next build with U-boot and Kernel update RC6.

[avafinger]

Here is the support for DT Overlays. Assuming you asked for and known how to use DTO.
There is support for DTO on boot time.

Please, make a backup and try this:

https://github.com/avafinger/bananapi-zero-ubuntu-base-minimal/releases/tag/v1.7

[avafinger]

Updated with a sample, I think this should work.

[avafinger]

Install fix.
https://github.com/avafinger/bananapi-zero-ubuntu-base-minimal/releases/tag/v1.8

[lbernstone]

Sorry it took me so long to get back to this.
So, in order to use an overlay, I am going to have to rebuild the whole Uboot image? This seems like a much more intensive process than just recreating the dtb. Is it possible to use a wildcard in the ext4load line so it looks something like:
ext4load mmc 0 ${fdtovaddr} overlays/*.dto
and then any files added into the overlays folder will be included?

[avafinger]

You need to update u-boot and kernel as described here: https://github.com/avafinger/bananapi-zero-ubuntu-base-minimal/releases/tag/v1.8 (or later)
and https://github.com/avafinger/bananapi-zero-ubuntu-base-minimal/releases/tag/v1.7

Not sure if * will load all, but you can give it a try.

No need to rebuild anything, it is already built..

[avafinger]

or you can store the files in a variable like this:
FIX

overlay=file1 file2 file3
for ov in ${overlay}; do
    echo overlaying ${ov}...
    load ${devtype} ${devnum}:${bootpart} ${fdtovaddr} /boot/overlays/${ov}.dto && fdt apply ${fdtovaddr}
done

[lbernstone]

I would have to run mkimage every time to change the overlays. This is not really useful for my use case (changing a couple lines in the dt). The overlays work, so I'll go ahead and close the issue.

[avafinger]

I would have to run mkimage every time to change the overlays.

No need to run mkimage at any time. Just change dts and recompile, that's all you need.