Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755508Ab0GXMSf (ORCPT ); Sat, 24 Jul 2010 08:18:35 -0400 Received: from einhorn.in-berlin.de ([192.109.42.8]:47275 "EHLO einhorn.in-berlin.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754652Ab0GXMSd (ORCPT ); Sat, 24 Jul 2010 08:18:33 -0400 X-Envelope-From: stefanr@s5r6.in-berlin.de Message-ID: <4C4ADA02.1050704@s5r6.in-berlin.de> Date: Sat, 24 Jul 2010 14:18:10 +0200 From: Stefan Richter User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8.1.23) Gecko/20100627 SeaMonkey/1.1.18 MIME-Version: 1.0 To: Martin Mokrejs CC: Jay Fenlason , LKML , linux1394-devel@lists.sourceforge.net Subject: Re: 2.6.35-rc6 to 2.6.32.16: JuJu firewire issues References: <4C49A291.20001@ribosome.natur.cuni.cz> <20100723180807.GA32319@redhat.com> <4C49E1A2.7050606@ribosome.natur.cuni.cz> <4C4A074D.4050305@s5r6.in-berlin.de> <4C4A9DD8.9080200@s5r6.in-berlin.de> <4C4AD65D.5090008@ribosome.natur.cuni.cz> In-Reply-To: <4C4AD65D.5090008@ribosome.natur.cuni.cz> X-Enigmail-Version: 0.96.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1506 Lines: 32 Martin Mokrejs wrote: > I tried in the morning to connect the IcyBox to this laptops internal > Ricoh Co Ltd R5C552 IEEE 1394 Controller but had issues to power-up the drive > at all. Not even using USB hub to supply power to it. I connected it to > the ricoh chip via a 6 to 4 pin cable but also tried the not very good > Kouwell 7004 PCMCIA card (which does not supply enough power unless I > buy external, optional power supply of unknown specs and plug it into the > PCMCIA card). FireWire CardBus cards do not (or more precisely, must not) provide bus power at all, unless if they have a power input port and a fitting PSU is connected to it. If a CardBus card puts power onto the FireWire bus without any extra PSU connected, then this card is miswired and not spec compliant. A FireWire bus power provider is required to be able to deliver 1.5 A current or more, at 8 V or more. That can't be done via CardBus. 4-pin FireWire ports OTOH do not provide bus power of course; they lack the respective pins. Some FireWire disk enclosures can optionally be powered via USB, but we all know how unreliable USB bus power is. Prefer either a dedicated PSU or regular FireWire bus power. -- Stefan Richter -=====-==-=- -=== ==--- http://arcgraph.de/sr/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/