RE: [linux-usb-devel] Re: ATI RS480-based motherboard: stuck while booting with kernel >= 2.6.15 rc1

["Aleksey Gorelov" <Aleksey_Gorelov@Phoenix.com>]

Hi Dave,

>-----Original Message-----
>From: linux-kernel-owner@vger.kernel.org 
>[mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of David Brownell
>Sent: Monday, January 23, 2006 11:01 AM
>To: linux-usb-devel@lists.sourceforge.net
>Cc: Andrew Morton; Carlo E. Prelz; linux-kernel@vger.kernel.org
>Subject: Re: [linux-usb-devel] Re: ATI RS480-based 
>motherboard: stuck while booting with kernel >= 2.6.15 rc1
>
>
>> OK, so it sounds like quirk_usb_disable_ehci() caused your 
>machine to hang
>> with the old BIOS.  That's fairly bad behaviour from the kernel, even
>> though the BIOS presumably had some problems.
>
>I think what happened is the "always run quirks" code got turned into
>the default too early, before the EHCI "quirk" version of the handoff
>code got checked against what most systems have been using for the past
>several years.
>
>I noticed at least one suspicous thing:  it enables an SMI IRQ.

  As far as I recall, some BIOSes can be stuck at handoff forever
waiting for SMI if this is not enabled. No doubt BIOS bug, and seems
like work around brakes some other systems, grrr...

>Even in cases when the boot firmware says it's not using EHCI ...
  That's what I do not understand. SOOE is enabled only if BIOS ownes
EHCI - check for ECHI_USBLEGSUP_BIOS in previous 'if' statement. Am I
missing something ?

Thanks,
Aleks.

>easy to imagine that causing hangage.
>
>
>Maybe this time it'd help to tell your BIOS "yes, DO use USB".
>Or, the attached patch might help.  Please try both experiments.
>
>- Dave
>
>
>
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