From: Vitaly Bordug <vitb@kernel.crashing.org>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: USB list <linux-usb@vger.kernel.org>,
Mark, "linuxppc-dev@ozlabs.org" <linuxppc-dev@ozlabs.org>,
Miesfeld <mmiesfeld@amcc.com>, Stefan Roese <sr@denx.de>
Subject: Re: [RFC][USB] powerpc: Workaround for the PPC440EPX USBH_23 errata
Date: Sat, 6 Sep 2008 13:02:54 +0400 [thread overview]
Message-ID: <20080906130254.43848a08@vitb-lp> (raw)
In-Reply-To: <Pine.LNX.4.44L0.0809051111220.2493-100000@iolanthe.rowland.org>
В Fri, 5 Sep 2008 11:17:03 -0400 (EDT)
Alan Stern <stern@rowland.harvard.edu> пишет:
> On Fri, 5 Sep 2008, Vitaly Bordug wrote:
>
> > > > Not every hub will work (none of available did so far), and it
> > > > is often not an option for embedded device without rewiring.
> > >
> > > It's odd that your hubs don't work. What's wrong with them?
> > >
> >
> > well, they do not have transaction translators then. Nothing really
> > wrong
>
> No. If the hubs run at high speed then they must have transaction
> translators; it's required by the USB 2.0 specification.
>
> Did you try using them with ohci-hcd not loaded?
yes, not with every unit though. That seems to be usb hub issue then.
Anyway, the patch is targeted more to
the embedded platforms, that cannot afford work the issue around with
extra devices.
>
> Alan Stern
next prev parent reply other threads:[~2008-09-06 9:05 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-26 22:23 [RFC][USB] powerpc: Workaround for the PPC440EPX USBH_23 errata Vitaly Bordug
2008-08-27 14:36 ` Alan Stern
2008-08-28 19:32 ` Vitaly Bordug
2008-08-28 20:13 ` Alan Stern
2008-08-28 21:11 ` Steven A. Falco
2008-08-28 21:33 ` Alan Stern
2008-08-28 22:43 ` Benjamin Herrenschmidt
2008-08-29 15:26 ` Alan Stern
2008-08-29 18:20 ` Vitaly Bordug
2008-08-29 21:30 ` Alan Stern
2008-09-04 20:48 ` Vitaly Bordug
2008-09-04 21:40 ` Alan Stern
2008-09-05 1:35 ` Benjamin Herrenschmidt
2008-09-05 13:01 ` Vitaly Bordug
2008-09-05 15:17 ` Alan Stern
2008-09-06 9:02 ` Vitaly Bordug [this message]
2008-08-29 13:25 ` Steven A. Falco
2008-08-29 17:56 ` Matthias Fuchs
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