disable 64-bit dma for one PCI slot only?

John Baldwin jhb at freebsd.org
Mon Jul 18 19:13:22 UTC 2011

On Friday, July 15, 2011 6:07:31 pm Mark McConnell wrote:
> Dear folks,
> I have two LSI raid cards, one of which (SCSI 320-I) supports 
> 64-bit DMA when 4GB+ of DDR is present and another which 
> does not (SATA 150-D) .  Consquently I've disabled 64-bit 
> addressing for amr devices.
> I would like to disable 64-bit addressing for the SATA card, but 
> permit it for the SCSI card.  Is this possible?

You'd have to hack the driver perhaps to only disable 64-bit DMA for certain 
PCI IDs.  It probably already does this?

John Baldwin

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