From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id DEE212C00C0 for ; Mon, 12 Aug 2013 12:32:42 +1000 (EST) Message-ID: <1376274739.32100.149.camel@pasglop> Subject: Re: Failure to detect PCI card From: Benjamin Herrenschmidt To: Peter LaDow Date: Mon, 12 Aug 2013 12:32:19 +1000 In-Reply-To: References: <20130805202559.0086e806@crub> <52000ACA.1010606@ovro.caltech.edu> <520058E0.8080304@ovro.caltech.edu> Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 Cc: Anatolij Gustschin , linuxppc-dev@lists.ozlabs.org, David Hawkins List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Thu, 2013-08-08 at 13:31 -0700, Peter LaDow wrote: > 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! Do that help with e1000 as well ? IE. A bad clock might have caused malfunctions of the DMA for example... Cheers, Ben.