linux-kernel - Re: 2.6.35-rc6 to 2.6.32.16: JuJu firewire issues

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Message-ID: <4C4ADA02.1050704@s5r6.in-berlin.de>
Date:	Sat, 24 Jul 2010 14:18:10 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Martin Mokrejs <mmokrejs@...osome.natur.cuni.cz>
CC:	Jay Fenlason <fenlason@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux1394-devel@...ts.sourceforge.net
Subject: Re: 2.6.35-rc6 to 2.6.32.16: JuJu firewire issues

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/
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