1bbf21555SRichard Lowe.\" 2bbf21555SRichard Lowe.\" This file and its contents are supplied under the terms of the 3bbf21555SRichard Lowe.\" Common Development and Distribution License ("CDDL"), version 1.0. 4bbf21555SRichard Lowe.\" You may only use this file in accordance with the terms of version 5bbf21555SRichard Lowe.\" 1.0 of the CDDL. 6bbf21555SRichard Lowe.\" 7bbf21555SRichard Lowe.\" A full copy of the text of the CDDL should have accompanied this 8bbf21555SRichard Lowe.\" source. A copy of the CDDL is also available via the Internet at 9bbf21555SRichard Lowe.\" http://www.illumos.org/license/CDDL. 10bbf21555SRichard Lowe.\" 11bbf21555SRichard Lowe.\" 12*92279cb6SRobert Mustacchi.\" Copyright 2025 Oxide Computer Company 13bbf21555SRichard Lowe.\" 14*92279cb6SRobert Mustacchi.Dd January 11, 2025 15bbf21555SRichard Lowe.Dt USMN 4D 16bbf21555SRichard Lowe.Os 17bbf21555SRichard Lowe.Sh NAME 18bbf21555SRichard Lowe.Nm usmn 19bbf21555SRichard Lowe.Nd AMD SMN user access driver 20bbf21555SRichard Lowe.Sh SYNOPSIS 21bbf21555SRichard Lowe.Pa /devices/pseudo/amdzen@0/usmn@2:usmn.* 22bbf21555SRichard Lowe.Sh DESCRIPTION 23bbf21555SRichard LoweThe 24bbf21555SRichard Lowe.Nm 25bbf21555SRichard Lowedriver provides the ability to read and write data from the AMD System 26bbf21555SRichard LoweManagement Network 27bbf21555SRichard Lowe.Pq SMN 28bbf21555SRichard Loweon AMD Family 17h 29*92279cb6SRobert Mustacchi.Pq Zen, Zen+, and Zen 2 , 30*92279cb6SRobert MustacchiAMD Family 19h 31*92279cb6SRobert Mustacchi.Pq Zen 3 and Zen 4 , 32*92279cb6SRobert Mustacchiand AMD Family 1ah 33*92279cb6SRobert Mustacchi.Pq Zen 5 34bbf21555SRichard Loweprocessors. 35bbf21555SRichard Lowe.Pp 36bbf21555SRichard LoweThis driver is intended strictly for facilitating platform development 37bbf21555SRichard Loweand is not recommended for systems that aren't doing kernel and platform 38bbf21555SRichard Lowedevelopment on AMD Zen platforms. 39bbf21555SRichard LoweArbitrary writes to the SMN can severely damage and destabilize the system. 40bbf21555SRichard LoweIf you do not need access to the SMN, then this driver should not be 41bbf21555SRichard Lowepresent on the system. 42bbf21555SRichard Lowe.Sh SEE ALSO 43bbf21555SRichard Lowe.Xr amdzen 4D , 44bbf21555SRichard Lowe.Xr zen_udf 4D 45