What:		/sys/class/mei/
Date:		May 2014
KernelVersion:	3.17
Contact:	Tomas Winkler <tomas.winkler@intel.com>
Description:
		The mei/ class sub-directory belongs to mei device class


What:		/sys/class/mei/meiN/
Date:		May 2014
KernelVersion:	3.17
Contact:	Tomas Winkler <tomas.winkler@intel.com>
Description:
		The /sys/class/mei/meiN directory is created for
		each probed mei device

What:		/sys/class/mei/meiN/fw_status
Date:		Nov 2014
KernelVersion:	3.19
Contact:	Tomas Winkler <tomas.winkler@intel.com>
Description:	Display fw status registers content

		The ME FW writes its status information into fw status
		registers for BIOS and OS to monitor fw health.

		The register contains running state, power management
		state, error codes, and others. The way the registers
		are decoded depends on PCH or SoC generation.
		Also number of registers varies between 1 and 6
		depending on generation.

What:		/sys/class/mei/meiN/hbm_ver
Date:		Aug 2016
KernelVersion:	4.9
Contact:	Tomas Winkler <tomas.winkler@intel.com>
Description:	Display the negotiated HBM protocol version.

		The HBM protocol version negotiated
		between the driver and the device.

What:		/sys/class/mei/meiN/hbm_ver_drv
Date:		Aug 2016
KernelVersion:	4.9
Contact:	Tomas Winkler <tomas.winkler@intel.com>
Description:	Display the driver HBM protocol version.

		The HBM protocol version supported by the driver.