| USMN(4D) | Devices | USMN(4D) |
usmn — AMD SMN
user access driver
/devices/pseudo/amdzen@0/usmn@2:usmn.*
The usmn driver provides the ability to
read and write data from the AMD System Management Network (SMN) on AMD
Family 17h (Zen, Zen+, and Zen 2) and AMD Family 19h (Zen 3) processors.
This driver is intended strictly for facilitating platform development and is not recommended for systems that aren't doing kernel and platform development on AMD Zen platforms. Arbitrary writes to the SMN can severely damage and destabilize the system. If you do not need access to the SMN, then this driver should not be present on the system.
| July 30, 2021 | OmniOS |