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To: linux-kernel@vger.kernel.org
Subject: Re: [bug] usb-uhci locks up on boot half the time
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From: hnh@linpro.no (Harald Nordg?rd-Hansen)
Date: 11 Nov 2000 10:49:31 +0100
In-Reply-To: David Ford's message of "Thu, 09 Nov 2000 14:40:36 -0800"
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David Ford <david@linux.com> writes:
> The oddity is that kdb shows the machine to lock up on the popf in
> pci_conf_write_word()+0x2c.  I never did get around to digging up this
> routine and looking at the code, but I suspect this is a final return
> from the routine.  I'm rather confused however, I have no idea why a
> flags pop would hang the hardware.

I've got a machine here that locks solid every time with -test10.  It
locks up towards the end of start_uhci, where it calls:
----
/* disable legacy emulation */
pci_write_config_word (dev, USBLEGSUP, USBLEGSUP_DEFAULT);
----

Now, disabling this call seems to make the system work perfectly.  The
machine is a Celeron 500 / Asus P3B-F (I think, it's at the office).
Also -test8 works, I haven't tried any of the test11-pre* versions yet.

Any things I should try to test?  (Please CC me, as I don't have the
time to follow linux-kernel as closely as I would like at the moment.)

-Harald
-- 
Harald Nordg?rd-Hansen, Linpro AS  <><  http://www.linpro.no/~hnh/
PB. 375, N-1601 Fredrikstad, Norway    Phone/Fax: +47 6935 2424/25
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