I've managed to get this to work finally, for my use case, which is a directly connected Seagate desktop drive - ID 0bc2:3321 Seagate RSS LLC - using the latest Armbian release 20.08.3 with kernel version 5.8.10, booting from petitboot.   The steps I took were basically:   Install armbian 20.08.1 onto an MMC card. Boot the N2 from the card and "apt update" and "apt upgrade" to bring it up to the latest kernel etc. and perform other basic configuration. Make a