sb600/sb700 ohci experimental patch

[Svein Skogen (listmail account)]

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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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