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NHI(4) Device Drivers Manual NHI(4)

nhiUSB4 host interface

nhi* at pci?

The nhi driver provides support for the USB4 host interface.

The driver does not implement any meaningful USB4 connection manager functionality. It only puts the router that is part of the host interface into a sleep state during suspend.

intro(4), pci(4), xhci(4)

The nhi driver first appeared in OpenBSD 7.9.

The nhi driver was written by Mark Kettenis <kettenis@openbsd.org>.

OpenBSD-current November 3, 2025 NHI(4)