Re: Determine if card is in 32 or 64 bit PCI slot?

[Johannes Erdfelt]

On Wed, Aug 08, 2001, Alan Cox <[e-mail]> wrote:
> > I have a 64 bit PCI card which will work in either a 32 bit or 64 bit
> > PCI slot.
> > 
> > I'd like to make the driver autodetect which kind of slot the card is
> > in and set the dma_mask correctly, but I can't seem to figure out how to
> > do this.
> 
> Are you sure the card actually needs this. Most such cards support dual address
> cycle, so when placed in a 32bit slot  will still do 64bit DMA

No I don't know if it's needed. I had no idea that PCI could do that.

Is dual address cycle mandated by the PCI specs?

JE