Date: Fri, 25 Sep 2009 10:22:23 +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: <4ABC7DBF.30607@stillbilde.net> In-Reply-To: <4ABC7B3C.6090803@icyb.net.ua> References: <4ABA36B1.9070706@icyb.net.ua> <200909241651.47850.hselasky@c2i.net> <4ABC646D.4070604@icyb.net.ua> <4ABC7912.6070301@stillbilde.net> <4ABC7B3C.6090803@icyb.net.ua>
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Andriy Gapon wrote:
> on 25/09/2009 11:02 Svein Skogen (listmail account) said the following:
>> 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...
>
> It very well could, but...
>
> We do perform proper OHCI takeover, so we don't expect firmware to mess with the
> controllers after it is finished.
>
> Also, I personally have everything "USB legacy" disabled in my BIOS ("USB Legacy
> Support", "USB Keyboard support", "USB Mouse support"). Although, Gigabyte BIOSes
> are known to be sometimes smarter than they appear and to "autodetect" things when
> they are explicitly turned off in settings.
>
> Last point. Explaining is half the job. Fixing / working around is the other half.
>
> P.S. I am not sure what "timing issue" you referred to.
http://lists.freebsd.org/pipermail/freebsd-stable/2009-September/051812.html
//Svein
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