From: David Hawkins <dwh@ovro•caltech.edu>
To: Peter LaDow <petela@gocougs•wsu.edu>
Cc: Anatolij Gustschin <agust@denx•de>, linuxppc-dev@lists•ozlabs.org
Subject: Re: Failure to detect PCI card
Date: Thu, 08 Aug 2013 15:10:45 -0700 [thread overview]
Message-ID: <52041765.30501@ovro.caltech.edu> (raw)
In-Reply-To: <CAN8Q1EczGM+aQMPti+QdvUHHbsn=ARV7sKptXc5M7gvEFoDkKQ@mail.gmail.com>
Hi Pete,
> For those that are interested, we did figure out what was going on.
> Turns out that the clock buffer driving the PCI connector was, well,
> less than adequate. With some cards, the load on the clock line was
> large enough that the clock was in horrible shape. Fixing the clock
> line and the card that failed to be recognized started working. For
> the other cards that worked, the load on the clock line was
> significantly less, but the clock was still marginal.
>
> Anyway, turned out to be a hardware issue. Thanks to all that helped!
Thanks for posting that you solved the issue.
The old engineering debug mantra ran true; check the power, then
clocks, then debug :)
Cheers,
Dave
next prev parent reply other threads:[~2013-08-08 22:10 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-05 17:58 Failure to detect PCI card Peter LaDow
2013-08-05 18:25 ` Anatolij Gustschin
2013-08-05 20:12 ` Peter LaDow
2013-08-05 20:27 ` David Hawkins
2013-08-05 20:49 ` Peter LaDow
2013-08-05 21:08 ` David Hawkins
2013-08-05 21:10 ` David Hawkins
2013-08-05 22:11 ` Peter LaDow
2013-08-05 23:07 ` Peter LaDow
2013-08-05 23:14 ` Peter LaDow
2013-08-06 2:01 ` David Hawkins
2013-08-08 20:31 ` Peter LaDow
2013-08-08 22:10 ` David Hawkins [this message]
2013-08-12 2:32 ` Benjamin Herrenschmidt
2013-08-12 16:52 ` Peter LaDow
2013-08-06 20:03 ` Anatolij Gustschin
2013-08-05 18:32 ` Wolfgang Denk
2013-08-05 18:36 ` Peter LaDow
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