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avafinger / bananapi-zero-ubuntu-base-minimal

BananaPi M2 Zero - Ubuntu Focal Base Minimal Image (Experimental) - U-Boot 2017.09 / Kernel 4.18.y / Kernel 4.19.y / Kernel 4.20.y / Kernel 5.3.y / Kernel 5.6.y / Kernel 5.7.y / Kernel 5.11.y
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dtb overlay? #25

Closed lbernstone closed 5 years ago

lbernstone commented 5 years ago

Is there any way to use dtb overlays with this image, or do they need to be merged into the main dtb?

avafinger commented 5 years ago

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 commented 5 years ago

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 commented 5 years ago

Updated with a sample, I think this should work.

avafinger commented 5 years ago

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

lbernstone commented 5 years ago

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 commented 5 years ago

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 commented 5 years ago

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 commented 5 years ago

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 commented 5 years ago

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.