Odroid N2 V8.24 doesn't boot

On my N2+ Armbian 23.11.1 and Dietpi 8.24 function without issue when run from an SD card.

My goal is to get Dietpi running from SSD only (no SD). Modifying /boot/boot.cmd (and compiling to boot.scr with mkimage) on the SSD allows the system to boot and the OS to partially start up but then fail – for both Armbian and Dietpi.

Armbian:

Dietpi is more verbose:

Strange! It appears to me that disk access works at first, but then fails.