Hello,

This question comes from building Raspberry Pi 5 image in Yocto.

I am trying to add uart device tree overlays to the image.
What's done is to add the overlays in the machine configuration:

> 
> RPI_KERNEL_DEVICETREE_OVERLAYS += " \
> overlays/uart0-pi5.dtbo \
> overlays/uart1-pi5.dtbo \
> overlays/uart2-pi5.dtbo \
> overlays/uart3-pi5.dtbo \
> overlays/uart4-pi5.dtbo \
> "
> 

They are also automatically added to KERNEL_DEVICETREE and it works fine to 
generate the dt overlay binary in building a Linux kernel.

Then when building the image, there is an error as below:

> 
> | DEBUG: Executing shell function do_image_wic
> | INFO: Creating image(s)...
> |
> | WARNING: bootloader config not specified, using defaults
> |
> | ERROR: Malformed boot file entry: uart0-pi5.dtbo;
> |
> | WARNING: exit code 1 from a shell command.
> 

I am using a custom layer based on Poky scarthgap and meta-raspberrypi 
scarthgap.
What might be missed in the recipes? It looks like there is some check when 
packing the wic image. Any inputs will be appreciated.

Thanks!
Crane
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