Hi!

If you want to test UBI fastmap you can use my torture.sh script.
Please adjust it to your needs (N, MTD device, UBI device, volume size).
WARNING: It erases the MTD device!

paranoia.diff is also very useful to catch errors.
It turns all ubi_asserts() into BUG() and adds an extra self check to detect
duplicated PEBs.
Also bit flip emulation and all other UBI self-checks are enabled by default.

Have fun!
//richard