Most of what I post falls into the category of "Something that should be working but isn't and how to fix it." -- all in the hope that someday I'll save someone some aggravation. Some of what I post, however, is just me being me!
This was puzzling me for awhile. Found the answer on the arch linux wiki which is to do a reboot. Apparently if there is skew between the latest kernel and the running kernel, things won't work. After a reboot it moutned find using MTD stuff.