Thanks for your work , danboid !
I agreed that Manjaro ARM aml images that already contain the linux-aml kernel is necessary for new comers. I have a TV box which ships with S905M-B soc , 1G ram, 4G EMMC ,100M Lan port ,rtl8189etv wifi and 3 leds .After several tests with vim2 image, I figured out that mainline kernel 5.11 could boot into filesystem while 5.13 not, which means you could not boot if you flashed later releases like 21.06 or updated from 21.04 directly without some tweaking. You could read the details in my post :
Best regards .