HEADS UP: major CAM ATA MFC

[Adam Vande More]

>
> I don't know.  I'm waiting for someone to actually write documentation
> on this.  I keep seeing commits talking about ATA disks via CAM (e.g.
> SCSI emulation for ATA disks), but the only thing I'm aware of that
> exists is SCSI emulation for ATAPI devices.
>
> > I've just tried "Modular ATA" configuration of Intel ICH7-based system
> plus "device ahci"
> > minus all traditional ata(4) kernel configuration, the kernel builds fine
> > but boot messages do not show any attempt to detect my SATA HDD,
> > so root mount just fails (I use GEOM UFS labels in my /etc/fstab).
> > Typing ? at "mounroot" prompt I see only daX devices standing for my USB
> cardreader
> > and no device for HDD.
>
> This sounds like a different problem.  You may want to talk to mav@
> about this.
>
> > It seems I miss ada(4) device and I cannot find it in 8.0 - not ada.ko
> nor "device ada".
>
> Same.
>

 To enable ahci, put ahci_load="YES" into loader.conf.  Upon reboot, drives
will be detected as adaX eg

galacticdominator% dmesg |grep ada
GEOM_STRIPE: Disk ada3 attached to stripe0.
GEOM_STRIPE: Disk ada4 attached to stripe0.
    adam at galacticdominator.com:/usr/obj/usr/src/sys/GENERIC amd64
ada0 at ahcich0 bus 0 target 0 lun 0
ada0: <ST31000528AS CC37> ATA/ATAPI-8 SATA 2.x device
ada0: 300.000MB/s transfers
ada0: 953869MB (1953525168 512 byte sectors: 16H 63S/T 16383C)
ada0: Native Command Queueing enabled
ada1 at ahcich1 bus 0 target 0 lun 0
ada1: <ST3750330AS SD15> ATA/ATAPI-8 SATA 2.x device
ada1: 300.000MB/s transfers
ada1: 715404MB (1465149168 512 byte sectors: 16H 63S/T 16383C)
ada1: Native Command Queueing enabled
ada2 at ahcich3 bus 0 target 0 lun 0
ada2: <ST3500320AS AD14> ATA/ATAPI-8 SATA 2.x device
ada2: 300.000MB/s transfers
ada2: 476940MB (976773168 512 byte sectors: 16H 63S/T 16383C)
ada2: Native Command Queueing enabled
ada3 at ahcich4 bus 0 target 0 lun 0
ada3: <ST3500320AS AD14> ATA/ATAPI-8 SATA 2.x device
ada3: 300.000MB/s transfers
ada3: 476940MB (976773168 512 byte sectors: 16H 63S/T 16383C)
ada3: Native Command Queueing enabled
ada4 at ahcich5 bus 0 target 0 lun 0
ada4: <ST3750330AS SD15> ATA/ATAPI-8 SATA 2.x device
ada4: 300.000MB/s transfers
ada4: 715404MB (1465149168 512 byte sectors: 16H 63S/T 16383C)
ada4: Native Command Queueing enabled

BIOS must be set to ahci controller mode, and obviously both disk and
controller must support it.  This works fine off a GENERIC.

-- 
Adam Vande More