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Date:      Thu, 20 Sep 2001 23:02:44 +0200
From:      Simon L.Nielsen <simon@nitro.dk>
To:        <freebsd-stable@FreeBSD.ORG>
Subject:   USB kernel bug in 4.4 - Was: Re:[SOLVED] 4.4-Stable Hangs while booting GENERIC Kernel...
Message-ID:  <20010920210252.33E5A37B40A@hub.freebsd.org>
In-Reply-To: <200109180751.f8I7pM045549@earth.backplane.com>
References:  <Pine.SOL.4.33.0109180826380.4459-100000@red.csi.cam.ac.uk> <200109180751.f8I7pM045549@earth.backplane.com>

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On Tuesday 18 September 2001 09:51, Matt Dillon wrote:

> :I have for years had the IRQ disabled on the USB port cos I don't use
> :it and wanted to free one up. The new probe must expect that the USB port
> : is fully functioning. The 4.3 probe gives
>     Interesting.  I'm not sure there's a 'fix' for it per-say, other then
> to enable that IRQ.  but I'm glad you were able to figure out the problem!
I just upgraded two machines from 4.3-RELEASE-p14 to 4.4-RELEASE.

My normal workstation machine works just fine but my server wouldn't boot. I 
try to boot single-user mode but when it comes to asking about shell it just 
stops - actually it never display's that line. It works now because I saw the 
mail i'm qouting and enabled USB IRQ. It works fine with the 4.3 kernel 
(without an USB IRQ).

But before I found that fix I enabled the kernel debuger and saw a very 
strange thing. When I brake to the debugger I can see the "missing" output - 
and I can see that the shell command-line is there. When I then exit from the 
debugger it again doesn't respond and when I when break to the debugger again 
i can see the command i typed while the computer didn't respond and commands 
i have type (ls osv.) have been executed... I can't see how this can be 
related to the USB IRQ thing, but when I enable that USB IRQ assigment in the 
BIOS everything works fine.

I have no idea where to look for the bug, but if anyone would look at it i 
will gladly help.

Should i file a PR for this?

- -- 
/Simon
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