How to build U-boot for Balena Fin

Hello - I am trying to build U-boot from source for Balena fin (CM3+), with UART turned off so that the machinery attached to our serial port will not see the normal U-Boot serial printouts. However, building U-boot for 64-bit and 32-bit targets, and storing u-boot.bin as kernel7.img does not boot on the Balena fin. Are there any special instructions for building U-boot for Balena fin ?



Hi, did you try to download a production image from balenaCloud? They have no serial output so this should work well for your use case.

Anyway, the Yocto recipe that builds U-Boot is meta-balena/u-boot_%.bbappend at master · balena-os/meta-balena · GitHub, so you can use the steps in there and compare them to your method.