Get Device SDR Info

Change History

openUBMC Version	Revision Date	Description
25.06	2025/06/26	Initial draft: add command details

This API is used to obtain the SDR information of a device.

ReadOnly

Byte	Data Field
NetFn	S/E 04h
CMD	20h
(1)	Operation (optional) [7:1]-reserved [0]-1b=Get SDR count. This returns the total number of SDRs in the device. 0b=Get Sensor count. This returns the number of sensors implemented on LUN this command was addressed to.

Byte	Data Field
1	Completion Code
2	For Operation="Get Sensor Count" (or if byte 1 not present in request): Number of sensors in device for LUN this command was addressed to. For Operation="Get SDR Count": Total Number of SDRs in the device.
3	Flags: Dynamic population [7]-0b=static sensor population. The number of sensors handled by this device is fixed, and a query shall return records for all sensors. 1b=dynamic sensor population. This device may have its sensor population vary during 'run time' (defined as any time other that when an install operation is in progress). Reserved [6:4]-reserved Device LUNs [3]-1b=LUN 3 has sensors [2]-1b=LUN 2 has sensors [1]-1b=LUN 1 has sensors [0]-1b=LUN 0 has sensors
4:7	Sensor Population Change Indicator. LS byte first. Four byte timestamp, or counter. Updated or incremented each time the sensor population changes. This field is not provided if the flags indicate a static sensor population.

Request:

bash

ipmicmd -k "0f 00 04 20" smi 0

Response:

text

0f 77 01