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Re: Hi-Speed USB controller and au1500

To: Bruno Randolf <>
Subject: Re: Hi-Speed USB controller and au1500
From: Ralf Baechle <>
Date: Sat, 23 Oct 2004 17:24:10 +0200
Cc:, "'Eric DeVolder'" <>
In-reply-to: <>
Original-recipient: rfc822;
References: <CECB0B0453C6D511BEB800104B70FA47B4A025@STARBASE> <>
User-agent: Mutt/1.4.1i
On Sat, Oct 23, 2004 at 04:38:15PM +0200, Bruno Randolf wrote:

> would it be possible to use CONFIG_NONCOHERENT_IO=y only for USB, and not 
> PCI? 
> we have PCI cards (prism54) which only work without CONFIG_NONCOHERENT_IO, so 
> at the moment we can either have USB host or prism54 based PCI cards...

At the moment you can use such a partially coherent system with with
CONFIG_NONCOHERENT_IO.  It should work but of course not be overly efficient.
Supporting I/O coherency on a per device base is on the to do list.


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