Hi!

Few storage technologies such is EMMC, UFS, and NVMe support RPMB
hardware partition with common protocol and frame layout.
The RPMB partition cannot be accessed via standard block layer, but by a
set of specific commands: WRITE, READ, GET_WRITE_COUNTER, and
PROGRAM_KEY.
Such a partition provides authenticated and replay protected access,
hence suitable as a secure storage.

...and that is suitable from locking devices from their owners, as
Nokia N9 (aka brick, because Microsoft turned off support servers)
teached me recently.

So I have to ask -- what are non-evil uses for this?

There were "secure extensions" mentioned before, but my understanding
is that it currently has severe limitations making it unsuitable for
mainline kernel. (IOW you can't event test the functionality if you
are not Intel).
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html