Walnut base board PCI problems

Ira Weiny iweiny at acm.org
Fri Jan 25 06:20:05 EST 2002

Thank you all for you help.

It turns out that the one board which was working had correct strapping with
the PCI Sync clock at 33MHz.

A mix up in manufacturing allowed our other boards to be straped with a 16MHz
clock.  For those of you who don't know even if the PCI bus is in Asyncronous
mode the Sync clock must be >= to the bus speed.  In our case 33MHz.

Thanks so much for the input, it is always the simple ones which are hard to

Ira Weiny
iweiny at acm.org

On Fri, 18 Jan 2002 19:13:21 -0800
Ira Weiny <iweiny at acm.org> wrote:

> It has been some time since I have written to the list with a question so
> forgive me if this deficient in some way.
> We have a custom 405GP board which is basically a Walnut platform minus some of
> the peripherals like keyboard/mouse, FPGA, etc.
> We manufactured 10 boards and one works.  The others all display the same
> behavior below.

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