How to debug failing boot process?

[lyonlui]

I successfully compiled AOSP according to the documentation and generated an image for rasp pi 5. However, after writting to the sdcard, the Android system cannot be started in rasp pi 5. How should I debug and find problems in the boot process?

[KonstaT]

Best way is to have a serial console adapter on the dedicated UART connector on Pi 5. On Pi 4 this is on GPIO14/15 (on Pi 5 you would need to revert raspberry-vanilla/android_device_brcm_rpi5@71b154a to have this on the GPIO).

You can also use ADB on the USB-C port if you have outside power source (powered USB-C hub, 5V on the GPIO, etc).

logcat is used for Android system logs and dmesg for Linux kernel logs.

I would also recommend start by reading the Wiki if there's something that applies to your hardware setup.
https://github.com/raspberry-vanilla/android_local_manifest/wiki