>Here the issue is your ramdisk size. You need at least 64 sectors to be able to >format as FAT, try it: >https://acassis.wordpress.com/2020/08/23/how-to-use-ramdisk-as-filesystem- >on-nuttx/
That is the guide I followed Alan: nsh>mkrd 64 nsh>ls /dev /dev: console null ram0 ttyFC0 ttyFC1 ttyS0 ttyS1 zero nsh>mkfatfs /dev/ram0 mkfatfs_tryfat16: WARNING: Too few or too many clusters for FAT16: 4081 < 29 < 254 mkfatfs_clustersearch: WARNING: Cannot format FAT16 at 1 sectors/cluster nsh> Other variants of nsectors, that I've tried, give variations of the same error. This is why I still thingh there is a buried CONFIG setting I haven't enabled or have set wrong inadvertently. Most rocket ships have well written training manuals...this whole adventure is "let's have a guess what might work".
