The mei/ class sub-directory belongs to mei device class
-What: /sys/class/mei/meiN/
+What: /sys/class/mei/mei<N>/
Date: May 2014
KernelVersion: 3.17
Contact: Tomas Winkler <tomas.winkler@intel.com>
The /sys/class/mei/meiN directory is created for
each probed mei device
-What: /sys/class/mei/meiN/fw_status
+What: /sys/class/mei/mei<N>/fw_status
Date: Nov 2014
KernelVersion: 3.19
Contact: Tomas Winkler <tomas.winkler@intel.com>
Also number of registers varies between 1 and 6
depending on generation.
-What: /sys/class/mei/meiN/hbm_ver
+What: /sys/class/mei/mei<N>/hbm_ver
Date: Aug 2016
KernelVersion: 4.9
Contact: Tomas Winkler <tomas.winkler@intel.com>
The HBM protocol version negotiated
between the driver and the device.
-What: /sys/class/mei/meiN/hbm_ver_drv
+What: /sys/class/mei/mei<N>/hbm_ver_drv
Date: Aug 2016
KernelVersion: 4.9
Contact: Tomas Winkler <tomas.winkler@intel.com>
The HBM protocol version supported by the driver.
-What: /sys/class/mei/meiN/tx_queue_limit
+What: /sys/class/mei/mei<N>/tx_queue_limit
Date: Jan 2018
KernelVersion: 4.16
Contact: Tomas Winkler <tomas.winkler@intel.com>
Set maximal number of pending writes
per opened session.
-What: /sys/class/mei/meiN/fw_ver
+What: /sys/class/mei/mei<N>/fw_ver
Date: May 2018
KernelVersion: 4.18
Contact: Tomas Winkler <tomas.winkler@intel.com>
There can be up to three such blocks for different
FW components.
-What: /sys/class/mei/meiN/dev_state
+What: /sys/class/mei/mei<N>/dev_state
Date: Mar 2019
KernelVersion: 5.1
Contact: Tomas Winkler <tomas.winkler@intel.com>
POWER_DOWN
POWER_UP
-What: /sys/class/mei/meiN/trc
+What: /sys/class/mei/mei<N>/trc
Date: Nov 2019
KernelVersion: 5.5
Contact: Tomas Winkler <tomas.winkler@intel.com>
status information into trc status register
for BIOS and OS to monitor fw health.
-What: /sys/class/mei/meiN/kind
+What: /sys/class/mei/mei<N>/kind
Date: Jul 2020
KernelVersion: 5.8
Contact: Tomas Winkler <tomas.winkler@intel.com>