chewitt maybe you should change your nick to "wiki-chewitt"
thanks for being that responsive on my newbie questions - thankfully appreciated!
at least the firmwarelist has got that entry, so it seems to be fine:
brcmfmac43456-sdio.txt - add firmware for AP6256 used with Radxa Zero
On the running arch-system the loaded driver for ethernet is a yt6801 ( https://github.com/dante1613/Motorcomm-YT6801 ). I found yt6801.ko in /lib/modules/*kernelname*/kernel/drivers... So I guess thats always kernel specific and useless for LE. I found a forum entry from you from 2018 how to add/generate a new LE image, but the link is down and I did not understand how to check what modules/drivers/firmwares are currently already included nor, how to add that driver.