Messages in this thread |  | | Date | Fri, 10 Nov 2000 22:26:11 +0100 (CET) | From | Gérard Roudier <> | Subject | Re: PCI-PCI bridges mess in 2.4.x |
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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.
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