ahci4
Advanced host controller interface for serial ata
Usage
ahci* at acpi? ahci* at fdt? ahci* at pci? ahci* at jmb?
Overview
The ahci driver provides support for Serial ATA controllers conforming to the Advanced Host Controller Interface specification.
Several AHCI capable controllers also provide a compatibility mode that causes them to appear as a traditional ATA controller supported by pciide(4).
Although ahci controllers are actual ATA controllers, the driver emulates SCSI via a translation layer.
Setting the lowest bit (0x1) of the driver flags forces ahci to negotiate SATA 1 (1.5 Gb/s) transfer speeds only. It may be useful where higher speeds are unstable.
Releases
41 releases since OpenBSD 4.1; the text changed 8 times.