emveepee I did some test boots from an SD card yesterday using the image in my web-share (5.17-rc4 and u-boot 2022.01) and it worked fine from a boot perspective. I'd recommend getting an emmc module; they're faster and more reliable than SD cards.
Thanks and I agree, but I made a mistake only ordering one when I originally got my N2 and while the drives themselves are priced ok it is hard to justify paying 3x the indicated prices for extra shipping taxes and duties for a postage stamp sized item just to test. These same cards themselves work in my RPi's and VIMs so it is my SD reader that appears faulty so put me on the list for wanting tftp support.