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Date:      Wed, 06 Dec 2000 15:35:42 -0800
From:      Mike Smith <msmith@freebsd.org>
To:        Poul-Henning Kamp <phk@freebsd.org>
Cc:        current@freebsd.org, nsayer@freebsd.org
Subject:   Re: USB related commit leads to hung systems if USB-IRQ=Disabled in BIOS 
Message-ID:  <200012062335.eB6NZgF00739@mass.osd.bsdi.com>
In-Reply-To: Your message of "Thu, 07 Dec 2000 00:13:50 %2B0100." <55031.976144430@critter> 

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> 
> In my bios I have PnPOS=NO, USB-IRQ=Disabled.
> 
> The commit below results in a PCI interrupt storm and a terminally
> wedged system right after interrupts are enabled.

This would be a bug in the UHCI or OHCI driver then.  You can avoid it by 
not running the driver.

> Poul-Henning
> 
> | nsayer      2000/12/03 09:07:24 PST
> | 
> |   Modified files:
> |     sys/pci              ohci_pci.c uhci_pci.c
> |   Log:
> |   We now have the ability to assign the correct IRQ when PNP-OS is turned
> |   on. So stop failing the attach if the IRQ is unassigned. With this
> |   patch, I can now boot with PNP-OS YES in my BIOS no differently than
> |   PNP-OS NO (which is a good thing since Windows hangs with PNP-OS NO).
> |  
> |   Obtained from:        msmith
> |  
> |   Revision  Changes    Path
> |   1.21      +1 -11     src/sys/pci/ohci_pci.c
> |  1.32      +1 -11     src/sys/pci/uhci_pci.c
> 
> --
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk@FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
> 
> 
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