From: David Brownell <david-b@pacbell.net>
To: Richard Curnow <Richard.Curnow@superh.com>
Cc: Greg KH <greg@kroah.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Handling of bounce buffers by rh_call_control
Date: Thu, 18 Dec 2003 07:36:19 -0800 [thread overview]
Message-ID: <3FE1C973.2070600@pacbell.net> (raw)
In-Reply-To: <20031218143236.GB20057@malvern.uk.w2k.superh.com>
Richard Curnow wrote:
>
> IIRC, if I plug a USB2 device into a USB2 card but don't have the EHCI
> driver active, the device is just ignored, rather than falling back to
> using USB1.1 through OHCI? We certainly have some USB2 devices we'd
> like to use, even if the USB2 bandwidth might be throttled back by the
> bounce buffering overhead.
Yes, high speed USB transfers need the EHCI driver.
If that driver isn't running, then OHCI (or UHCI)
should kick in. (Assuming that driver is running!)
Most high speed storage seems to work with the current
EHCI code, although some hardware acts unhappy when
Linux talks to it faster than Windows does. That's
more of an issue on 2.6 than on 2.4 though.
- Dave
prev parent reply other threads:[~2003-12-18 15:30 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-17 11:41 Handling of bounce buffers by rh_call_control Richard Curnow
2003-12-17 16:29 ` David Brownell
2003-12-17 22:47 ` bill davidsen
[not found] ` <200312172247.RAA08325@gatekeeper.tmr.com>
2003-12-18 2:40 ` David Brownell
2003-12-18 14:32 ` Richard Curnow
2003-12-18 14:53 ` iproute2 and 2.6.0 kernel Remus
2003-12-22 19:07 ` bill davidsen
2003-12-30 11:31 ` Remus
2003-12-18 15:36 ` David Brownell [this message]
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