The 2 SATA drives are currently connected to SATA port 1 & 2 (so the BIOS

tells me).

I just connected another SATA drive to port number 4 and the same occured

for that drive too.
There are no further details following the scsibus0 line.
ahci0 at pci0 dev 14 function 0 "NVIDIA MCP73 AHCI" rev 0xa2: irq 11, AHCI

1.1

ahci0: failed to start command DMA on port 0, disabling

ahci0: failed to start command DMA on port 2, disabling

ahci0: failed to start command DMA on port 3, disabling <-----

scsibus0 at ahci0: 32 targets, initiator 32
I found some information about a bug with my Nvidia chipset and FreeBSD,

which refers to SATA drives -

http://www.nabble.com/i386-129542:-FreeBSD-7.1-RC1-installer-cannot-find-WD-SATA-hard-drive-with-MCP73M01H1-mainboard-(MCP73-SATA-controller)-td20928904.html

Do you think there could be a relationship there (even though it's a

different plaform?
On Mon, Apr 20, 2009 at 8:23 PM, Anathae Townsend wrote:
> I'm not an expert by any means when it comes to OpenBSD,

quoted text
> AHCI, or SATA, but here are some shots in the dark.

>

> Does your machine have four SATA ports on it?  Can you

> identify which of the four ports your two SATA drives are

> plugged into?  Can you add additional SATA drives and see

> if these errors are resolved or multiplied?

>

> First guess is that the AHCI method for deciding which ports

> have SATA devices attached is not working properly on your

> motherboard/chipset.  Second guess is that the chipset or

> motherboard has some problems with DMA happening the way

> that the ahci device expects it to work.

>

> Are there any sd devices listed after the scsibus0 line?

>

> something like this?

>

> scsibus1 at umass0: 2 targets, initiator 0

> sd0 at scsibus1 targ 1 lun 0:  4.08> SCSI0 0/direct removable

> sd0: drive offline

> sd1 at scsibus1 targ 1 lun 1:  4.08> SCSI0 0/direct removable

> sd1: drive offline

> sd2 at scsibus1 targ 1 lun 2:  4.08> SCSI0 0/direct removable

> sd2: drive offline

> sd3 at scsibus1 targ 1 lun 3:  4.08> SCSI0 0/direct removable

> sd3: drive offline

>

>

> Kristian Rooke Wrote

> > Thanks for the suggestions.

> >

> > I checked the BIOS configuration and it appears that the SATA

> > controller was

> > set to IDE (not sure how that happened). I have now set it to AHCI, but

> > I am

> > seeing another error in dmesg....

> >

> > ahci0 at pci0 dev 14 function 0 "NVIDIA MCP73 AHCI" rev 0xa2: irq 11,

> > AHCI

> > 1.1

> > ahci0: failed to start command DMA on port 0, disabling

> > ahci0: failed to start command DMA on port 2, disabling

> > scsibus0 at ahci0: 32 targets, initiator 32

> >

> > Does this mean that AHCI on my m/b is not supported in OpenBSD?

> > Any other thoughts?