> While this may or may not be the problem, you should know that the DECchip
> 21050 is a first-generation PCI-to-PCI bridge and contains a serious design
> flaw.  It is susceptible to deadlock under certain conditions.  Under certain
> cirumstances where a downstream and an upstream transaction are trying to
> proceed through a 21050 simultaneously, neither transaction will ever proceed.

Actually, I was under the impression (from discussions i'd seen about
the bug over a year ago) that the problem was specific to the Intel
Triton chipset, and was in fact a Triton bug which had been worked
around in later revs of the PPB...

However, my understanding could well be out of date, since it was
pre-PCI2.1...


chris