[lkml]   [2001]   [Aug]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: Determine if card is in 32 or 64 bit PCI slot?
On Tue, Aug 14, 2001, Jes Sorensen <> wrote:
> >>>>> "Johannes" == Johannes Erdfelt <> writes:
> Johannes> On Wed, Aug 08, 2001, Alan Cox <>
> Johannes> wrote:
> >> 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
> Johannes> No I don't know if it's needed. I had no idea that PCI could
> Johannes> do that.
> Johannes> Is dual address cycle mandated by the PCI specs?
> According to the PCI spec "The master is required in all cases to use
> two clocks to communicate a 64-bit address, since the width of a
> target's bus is not known during the address phase."
> Aka, the answer to your question is yes.

Ahh, excellent. Thank you very much.


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 12:57    [W:0.047 / U:0.892 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site