lkml.org 
[lkml]   [2000]   [Nov]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: PCI-PCI bridges mess in 2.4.x


On Sat, 11 Nov 2000, Ivan Kokshaysky wrote:

> On Fri, Nov 10, 2000 at 07:35:41PM +0100, Gerard Roudier wrote:
> > I only have spec 1.0 on paper. I should have checked 1.1. Anyway, it may
> > still exist bridges that have been designed prior to spec. 1.1.
>
> Yes, DEC 2105x bridges, for example.
>
> The only update listed in revision history is "Update to include
> target initial latency requirements", so this (base > limit) stuff
> must be in rev. 1.0 as well. Please check chapters 3.2.5.[6,8,9].

The revision history should be a lot pessimistic about the amount of
additions. Btw, rev. 1.0 April 5, 1994 is 63 pages, and rev 1.1 is about
147 pages, as you know.

> > > I/O is slightly different because it's optional for the bridge -
> > > but if it's implemented same rules apply.
> >
> > Will also check the spec. on this point. :)
>
> Also, according the spec, we need some paranoia checks ;-)
> 1. check if the bridge has an I/O window not implemented

Read-only, returning zero on read. Already present in spec. 1.0.

> 2. if the bridge has regular BARs, allocate them properly
> on the primary bus.

Limit < Base (new in 1.1, unless I missed the point. Btw, I actually
donnot want to read again P2P spec. 1.0 :-) )

Gérard.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 12:45    [W:0.040 / U:15.300 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site