| What: /sys/bus/mhi/devices/.../serialnumber |
| Date: Sept 2020 |
| KernelVersion: 5.10 |
| Contact: mhi@lists.linux.dev |
| Description: The file holds the serial number of the client device obtained |
| using a BHI (Boot Host Interface) register read after at least |
| one attempt to power up the device has been done. If read |
| without having the device power on at least once, the file will |
| read all 0's. |
| Users: Any userspace application or clients interested in device info. |
| |
| What: /sys/bus/mhi/devices/.../oem_pk_hash |
| Date: Sept 2020 |
| KernelVersion: 5.10 |
| Contact: mhi@lists.linux.dev |
| Description: The file holds the OEM PK Hash value of the endpoint device |
| obtained using a BHI (Boot Host Interface) register read after |
| at least one attempt to power up the device has been done. If |
| read without having the device power on at least once, the file |
| will read all 0's. |
| Users: Any userspace application or clients interested in device info. |
| |
| What: /sys/bus/mhi/devices/.../soc_reset |
| Date: April 2022 |
| KernelVersion: 5.19 |
| Contact: mhi@lists.linux.dev |
| Description: Initiates a SoC reset on the MHI controller. A SoC reset is |
| a reset of last resort, and will require a complete re-init. |
| This can be useful as a method of recovery if the device is |
| non-responsive, or as a means of loading new firmware as a |
| system administration task. |
| |
| What: /sys/bus/mhi/devices/.../trigger_edl |
| Date: April 2024 |
| KernelVersion: 6.10 |
| Contact: mhi@lists.linux.dev |
| Description: Writing a non-zero value to this file will force devices to |
| enter EDL (Emergency Download) mode. This entry only exists for |
| devices capable of entering the EDL mode using the standard EDL |
| triggering mechanism defined in the MHI spec v1.2. Once in EDL |
| mode, the flash programmer image can be downloaded to the |
| device to enter the flash programmer execution environment. |
| This can be useful if user wants to use QDL (Qualcomm Download, |
| which is used to download firmware over EDL) to update firmware. |
