What:		/sys/class/rpmb/
Date:		Jun 2017
KernelVersion:	4.12
Contact:	Tomas Winkler <tomas.winkler@intel.com>
Description:
		The rpmb/ class sub-directory belongs to RPMB device class.

		Few storage technologies such is EMMC, UFS, and NVMe support
		Replay Protected Memory Block (RPMB) hardware partition with
		common protocol and frame layout.
		Such a partition provides authenticated and replay protected access,
		hence suitable as a secure storage.

What:		/sys/class/rpmb/rpmbN/
Date:		Jun 2017
KernelVersion:	4.12
Contact:	Tomas Winkler <tomas.winkler@intel.com>
Description:
		The /sys/class/rpmb/rpmbN directory is created for
		each RPMB registered device.

What:		/sys/class/rpmb/rpmbN/type
Date:		Jun 2017
KernelVersion:	4.12
Contact:	Tomas Winkler <tomas.winkler@intel.com>
Description:
		The /sys/class/rpmb/rpmbN/type file contains device
		underlaying storage type technology: EMMC, UFS, SIM.

What:		/sys/class/rpmb/rpmbN/id
Date:		Jun 2017
KernelVersion:	4.12
Contact:	Tomas Winkler <tomas.winkler@intel.com>
Description:
		The /sys/class/rpmb/rpmbN/id file contains unique device id
		in a binary form as defined by underlying storage device.
		In case of multiple RPMB devices a user can determine correct
		device.
		The content can be parsed according the storage device type.

What:		/sys/class/rpmb/rpmbN/reliable_wr_cnt
Date:		Jun 2017
KernelVersion:	4.12
Contact:	Tomas Winkler <tomas.winkler@intel.com>
Description:
		The /sys/class/rpmb/rpmbN/reliable_wr_cnt file contains
		number of blocks that can be reliable written in a single request.