tjh.dev
Linux kernel mirror (for testing)
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linux
1What: /sys/bus/mhi/devices/.../serialnumber
2Date: Sept 2020
3KernelVersion: 5.10
4Contact: mhi@lists.linux.dev
5Description: 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.
10Users: Any userspace application or clients interested in device info.
11
12What: /sys/bus/mhi/devices/.../oem_pk_hash
13Date: Sept 2020
14KernelVersion: 5.10
15Contact: mhi@lists.linux.dev
16Description: 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.
21Users: Any userspace application or clients interested in device info.
22
23What: /sys/bus/mhi/devices/.../soc_reset
24Date: April 2022
25KernelVersion: 5.19
26Contact: mhi@lists.linux.dev
27Description: 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
33What: /sys/bus/mhi/devices/.../trigger_edl
34Date: April 2024
35KernelVersion: 6.10
36Contact: mhi@lists.linux.dev
37Description: 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.