Hello,

I observe a strange behavior while loading a device-tree. Short description: - I merged a .dtb with an .dtbo with the dtmerge command (raspbian) for my rpi zero w. - If I start the system the traditional way (without u-boot) everything seems fine. The new device (/dev/ttySC0) appears. - If i start the system with u-boot (bootz) the device (/dev/ttySC0) isn't there... if I inspect the device-tree with dtc -I fs /proc/device-tree it seems the device-tree was loaded correctly. But some different things are going on while using u-boot and not using it...

Can someone explain me what difference this is, or what exactly happens to the device-tree when u-boot is loading it instead the raspberry pi bootloader is loading it?

I'm using Alpine Linux 3.12, U-boot v2020.04 with standard rpi_0_w_defconfig

Thank you!

Clemens