Set Chip Bitwidth
更新时间： 2026/08/06
在Gitcode上查看源码Set Chip Bitwidth
Change History
| openUBMC Version | Revision Date | Description |
|---|---|---|
| 25.06 | 2025/06/26 | Initial draft: add command details |
Basic Information
Function Description
Sets the memory bit width. (This command supports only in-band transmission.)
Privilege
BasicSetting
Command Information
Request Information
| Byte | Data Field |
|---|---|
| NetFn | 30h |
| CMD | 92h |
| 1:3 | Manufacturer ID, LS Byte first. The length is fixed to three bytes. For example, if the vendor ID is 2011 and the corresponding hexadecimal value is 0x0007DB, the first byte is DBh, the second byte is 07h, and the third byte is 00h. |
| 4 | Sub command, Subcommand=44h, physical memory channel If the subcommand is 56h, the reported memory channel is a logical memory channel and needs to be converted to a physical channel by the BMC. |
| 5 | DIMM num: indicates the number of DIMMs whose memory information is displayed in the IPMI message. |
| 6 | First memory chip bit width: 0x00-x4, 0x01-x8, 0x02-x16, 0x03-other, 0xff-invalid |
| 7 | CPU ID of the first memory [7:4] Channel ID[3:0] when Sub command is 44h Logical Channel ID[3:0] when Sub command is 56h |
| 8 | DIMM ID of the first DIMM |
| 9 | First reserved field in the memory. |
| 10 | Bit width of the second memory chip |
| 11 | CPU ID [7:4] of the second DIMM, channel ID [3:0] |
| 12 | DIMM ID of the second DIMM |
| 13 | Second reserved field in the memory. |
| ~ | Other memory information is filled in the preceding format. |
Response Information
| Byte | Data Field |
|---|---|
| 1 | Completion Code |
| 2:4 | Manufacturer ID, LS Byte first. The length is fixed to three bytes. For example, if the vendor ID is 2011 and the corresponding hexadecimal value is 0x0007DB, the first byte is DBh, the second byte is 07h, and the third byte is 00h. |
Command Example
Set the memory bit width.
Request:
bash
ipmicmd -k "0f 00 30 92 DB 07 00 44 00" smi 0Response:
text
0f 31 00 92 00 db 07 00