kern/147086: AHCI not being enabled on PC

Ryan Holt ryan at
Wed May 26 17:30:14 UTC 2010

>Number:         147086
>Category:       kern
>Synopsis:       AHCI not being enabled on PC
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed May 26 17:30:13 UTC 2010
>Originator:     Ryan Holt
>Release:        8.0-Stable-201004
FreeBSD fs.holthome.local 8.0-STABLE-201004 FreeBSD 8.0-STABLE-201004 #0: Mon Apr  5 15:59:06 UTC 2010     root at  amd64

I've got a fresh install of FreeBSD 8.0-Stable-201004 built on a Gigabyte GA-K8U-754 Motherboard ( The boot drives are plugged directly into the Motherboard's SATA ports, which I believe is powered by a ULi M1689 chipset. I also have a Supermicro AOC-SAT2-MV8 PCI-X HBA card ( which has a Hercules-2 Rev. C0 SATA host controller built in. I've added ahci_load="YES" in my /boot/loader.conf and I can see that ahci.ko was loaded using klstat, but I do not see any drives appearing that use the ahci module. All drives are labeled /dev/ad* instead of /dev/ada* and hotswap doesn't work properly. Running dmesg |grep -i ahci comes back empty.
1. Boot computer
2. Run dmesg |grep -i ahci
3. Unplug drive, watch PC kernel panic


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