JFFS2 is for unmanaged flash without wear leveling. SD cards and eMMC inside the AC100 have firmware that handles wear leveling. JFFS2 would not be suitable for this appliction. nilfs2, however, is - I'm using it, but there area few hacks needed to get good performance out of it by managing when nilfs2_cleanerd runs to collect garbage.
JFFS2 is for unmanaged flash without wear leveling. SD cards and eMMC inside the AC100 have firmware that handles wear leveling. JFFS2 would not be suitable for this appliction. nilfs2, however, is - I'm using it, but there area few hacks needed to get good performance out of it by managing when nilfs2_cleanerd runs to collect garbage.