From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michael Buesch Subject: Re: [PATCH] b44: power down PHY when interface down Date: Sun, 1 Jul 2007 17:29:59 +0200 Message-ID: <200707011729.59673.mb@bu3sch.de> References: <4354d3270706300447ladcda4by987b1f87963112f9@mail.gmail.com> <200707011223.17235.mb@bu3sch.de> <20070701150006.GE7929@xi.wantstofly.org> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Cc: =?iso-8859-1?q?T=F6r=F6k_Edvin?= , zambrano@broadcom.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, power@bughost.org To: Lennert Buytenhek Return-path: Received: from static-ip-62-75-166-246.inaddr.intergenia.de ([62.75.166.246]:57918 "EHLO vs166246.vserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751132AbXGAPau (ORCPT ); Sun, 1 Jul 2007 11:30:50 -0400 In-Reply-To: <20070701150006.GE7929@xi.wantstofly.org> Content-Disposition: inline Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On Sunday 01 July 2007 17:00:06 Lennert Buytenhek wrote: > On Sun, Jul 01, 2007 at 12:23:16PM +0200, Michael Buesch wrote: > > > > More or less. You can't add the resistances like that, since the > > > bus isolation chip buffers the IDSEL signal, but it is correct that > > > if the host's IDSEL resistor is larger than a certain value, the > > > combination of the resistive coupling of IDSEL plus the extra buffer > > > in the isolator might be causing the IDSEL input on the 'guest' PCI > > > board to assert too late (or not assert at all), causing config > > > accesses to fail. > > > > > > (This also depends on the specific 'guest' PCI board used, as you > > > noted, due to differing IDSEL trace lengths/capacitances and input > > > pin capacitances on different PCI boards. Also, it might work at > > > 33 MHz but not work at 66 MHz, etc.) > > > > It doesn't work on any of my boards :( > > What extender board is this? Do you have docs/schematics? catalyst pcibx32 http://bu3sch.de/pcibx.php Docs yes, schematics no. > And what motherboard brand/type? ABit AI7 The other was some MSI and some very old random board. dunno. It works perfectly fine with other cards, like a linksys wlan card with a broadcom 4318 chip. It's just the b44 that doesn't work in the extender. > Actually, the IDSEL resistor would be on the computer's > motherboard, not on the PCI board. And to which address line Yeah, I know. > the IDSEL line is connected depends on which PCI slot on the > motherboard you're looking at. Sure. > A multimeter should do the trick, but I would advise against this > if you're not totally comfortable with hacking hardware. Well, you mean to measure the idsel against each possible AD line? It's difficult, because the motherboard is inside of a standard computer case and a watercooling system is mounted. So I would have to disassemble all that stuff. :/ Probably I can measure it with very thin probes on the slots without unmounting the board, hm... -- Greetings Michael.