Date: Fri, 25 Sep 2009 10:02:26 +0200 From: "Svein Skogen (listmail account)" <svein-listmail@stillbilde.net> To: Andriy Gapon <avg@icyb.net.ua> Cc: freebsd-current@freebsd.org, freebsd-usb@freebsd.org, Hans Petter Selasky <hselasky@c2i.net> Subject: Re: sb600/sb700 ohci experimental patch Message-ID: <4ABC7912.6070301@stillbilde.net> In-Reply-To: <4ABC646D.4070604@icyb.net.ua> References: <4ABA36B1.9070706@icyb.net.ua> <200909241651.47850.hselasky@c2i.net> <4ABC646D.4070604@icyb.net.ua>
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Andriy Gapon wrote:
> on 24/09/2009 17:51 Hans Petter Selasky said the following:
*SNIP!*
>
> Not sure how to interpret this.
> Either a timing issue, i.e. the register gets over-written some time after we
> program it.
> Or perhaps a bug in SMM code, i.e. when we generate an SMI (e.g. while doing
> ohci1 takeover) SMM code erroneously writes something to ohci0 ctrlhead.
> Or something else... :)
Could it be related to "USB Legacy Devices" in bios, and thus be the
same problem that was discussed recently (regarding HZ larger than 1000)?
An usb-legacy setup might explain both the register-changing _AND_ the
timing issue...
//Svein
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