| AMDSMN(4) | Device Drivers Manual (x86) | AMDSMN(4) | 
amdsmn —
amdsmn* at pci?
amdsmn driver provides support for resources on the
  System Management Network bus in AMD Family 19h processors, 17h processors and
  some later AMD Family 15h processors.
amdsmn driver first appeared in
  FreeBSD and NetBSD 9.0.
| October 2, 2022 | NetBSD 9.4 |