1 What: /sys/bus/mhi/devices/.../serialnumber 2 Date: Sept 2020 3 KernelVersion: 5.10 4 Contact: mhi@lists.linux.dev 5 Description: The file holds the serial number of the client device obtained 6 using a BHI (Boot Host Interface) register read after at least 7 one attempt to power up the device has been done. If read 8 without having the device power on at least once, the file will 9 read all 0's. 10 Users: Any userspace application or clients interested in device info. 11 12 What: /sys/bus/mhi/devices/.../oem_pk_hash 13 Date: Sept 2020 14 KernelVersion: 5.10 15 Contact: mhi@lists.linux.dev 16 Description: The file holds the OEM PK Hash value of the endpoint device 17 obtained using a BHI (Boot Host Interface) register read after 18 at least one attempt to power up the device has been done. If 19 read without having the device power on at least once, the file 20 will read all 0's. 21 Users: Any userspace application or clients interested in device info. 22 23 What: /sys/bus/mhi/devices/.../soc_reset 24 Date: April 2022 25 KernelVersion: 5.19 26 Contact: mhi@lists.linux.dev 27 Description: Initiates a SoC reset on the MHI controller. A SoC reset is 28 a reset of last resort, and will require a complete re-init. 29 This can be useful as a method of recovery if the device is 30 non-responsive, or as a means of loading new firmware as a 31 system administration task. 32 33 What: /sys/bus/mhi/devices/.../trigger_edl 34 Date: April 2024 35 KernelVersion: 6.10 36 Contact: mhi@lists.linux.dev 37 Description: Writing a non-zero value to this file will force devices to 38 enter EDL (Emergency Download) mode. This entry only exists for 39 devices capable of entering the EDL mode using the standard EDL 40 triggering mechanism defined in the MHI spec v1.2. Once in EDL 41 mode, the flash programmer image can be downloaded to the 42 device to enter the flash programmer execution environment. 43 This can be useful if user wants to use QDL (Qualcomm Download, 44 which is used to download firmware over EDL) to update firmware.
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