1What: /sys/class/mei/ 2Date: May 2014 3KernelVersion: 3.17 4Contact: Tomas Winkler <tomas.winkler@intel.com> 5Description: 6 The mei/ class sub-directory belongs to mei device class 7 8 9What: /sys/class/mei/mei<N>/ 10Date: May 2014 11KernelVersion: 3.17 12Contact: Tomas Winkler <tomas.winkler@intel.com> 13Description: 14 The /sys/class/mei/meiN directory is created for 15 each probed mei device 16 17What: /sys/class/mei/mei<N>/fw_status 18Date: Nov 2014 19KernelVersion: 3.19 20Contact: Tomas Winkler <tomas.winkler@intel.com> 21Description: Display fw status registers content 22 23 The ME FW writes its status information into fw status 24 registers for BIOS and OS to monitor fw health. 25 26 The register contains running state, power management 27 state, error codes, and others. The way the registers 28 are decoded depends on PCH or SoC generation. 29 Also number of registers varies between 1 and 6 30 depending on generation. 31 32What: /sys/class/mei/mei<N>/hbm_ver 33Date: Aug 2016 34KernelVersion: 4.9 35Contact: Tomas Winkler <tomas.winkler@intel.com> 36Description: Display the negotiated HBM protocol version. 37 38 The HBM protocol version negotiated 39 between the driver and the device. 40 41What: /sys/class/mei/mei<N>/hbm_ver_drv 42Date: Aug 2016 43KernelVersion: 4.9 44Contact: Tomas Winkler <tomas.winkler@intel.com> 45Description: Display the driver HBM protocol version. 46 47 The HBM protocol version supported by the driver. 48 49What: /sys/class/mei/mei<N>/tx_queue_limit 50Date: Jan 2018 51KernelVersion: 4.16 52Contact: Tomas Winkler <tomas.winkler@intel.com> 53Description: Configure tx queue limit 54 55 Set maximal number of pending writes 56 per opened session. 57 58What: /sys/class/mei/mei<N>/fw_ver 59Date: May 2018 60KernelVersion: 4.18 61Contact: Tomas Winkler <tomas.winkler@intel.com> 62Description: Display the ME firmware version. 63 64 The version of the platform ME firmware is in format: 65 <platform>:<major>.<minor>.<milestone>.<build_no>. 66 There can be up to three such blocks for different 67 FW components. 68 69What: /sys/class/mei/mei<N>/dev_state 70Date: Mar 2019 71KernelVersion: 5.1 72Contact: Tomas Winkler <tomas.winkler@intel.com> 73Description: Display the ME device state. 74 75 The device state can have following values: 76 INITIALIZING 77 INIT_CLIENTS 78 ENABLED 79 RESETTING 80 DISABLED 81 POWER_DOWN 82 POWER_UP 83 84What: /sys/class/mei/mei<N>/trc 85Date: Nov 2019 86KernelVersion: 5.5 87Contact: Tomas Winkler <tomas.winkler@intel.com> 88Description: Display trc status register content 89 90 The ME FW writes Glitch Detection HW (TRC) 91 status information into trc status register 92 for BIOS and OS to monitor fw health. 93 94What: /sys/class/mei/mei<N>/kind 95Date: Jul 2020 96KernelVersion: 5.8 97Contact: Tomas Winkler <tomas.winkler@intel.com> 98Description: Display kind of the device 99 100 Generic devices are marked as "mei" 101 while special purpose have their own 102 names. 103 Available options: 104 - mei: generic mei device. 105 - itouch: itouch (ipts) mei device. 106