Re: Problems with fxp0 on T30 with 5.1-RELEASE

From: Tobias Roth <roth_at_iam.unibe.ch>
Date: Fri, 18 Jul 2003 12:53:47 +0200
On Thu, Jul 17, 2003 at 09:58:00AM -0600, M. Warner Losh wrote:
> In message: <20030717082918.GA21592_at_speedy.unibe.ch>
>             Tobias Roth <roth_at_iam.unibe.ch> writes: this is caused by
> : an irq conflict. the bug was introduced some time between 5.0 and
> : 5.1.  i have no idea how to solve this, maybe someone else can help
> : here. maybe the ibm ps2 tool offers some help.
> 
> details?

kevin oberman suggested the use of the ps2 utility for thinkpads. i
did not have the chance to try it out myself.

> : another workaround is to free an irq. for me, disabling the pcmcia
> : stuff in the kernel config helped. others reported that disabling
> : the serial port helped for them.
> 
> interesting.

shortly after i discovered this problem, my TP started to have immense
problems with the summer heat and started crashing during buildworlds.
that's why i didn't look into the irq problem any further at this time.

now, i just got my TP back from ibm, and while they did not really fix
the heat problem (i will send it back to them next week), i got around
to do some irq tests.

irqs 0,1,8,12,13,14,15 are set and no subject of manual change.
irq 2, i have no idea about.
irq 3 and 4 are the infrared device and the serial port.
irq 7 is the parallel port
irq 6 can be freed by disabling legacy floppy support in the bios.
however it does not seem be taken by a different device when freed.

this leaves us with irqs 5,9,10,11 to distribute in the pci section
of the bios. after some playing around, i set INT[A-H] PCI IRQ to
5,9,10,11,11,9,10,11. I do not know whether the order matters, but
the distribution does. like this, every irq is assigned to two devices:

5->uhic0 and cbb0, 9->cbb1 and pcm0, 10->uhic2 and wi0, 11->uhic1 and fxp0.

the only drawback i encountered with these settings was a short hang
during boot when probing uhic2. it did not hang there before i started
switching around irqs, but i do not know what is wrong here.

other than that, everything works now.

> : this has to be fixed before 5.2, imho. it renders a default install
> : on thinkpads useless. note that this does NOT happen on all thinkpad
> : systems, i didn't figure out what makes up the difference.
> 
> sounds like a bug that needs to be fixed, but the details are so vague
> as to make that impossible.  chances are very good that someone with a
> clue (like me) will need a machine that fails to fix it.

the only odd thing is that 5.0 did not have this bug, while 5.1 has
it. if it needs fixing is up to you, i am now happy with the current
solution. but then, the default bios settings are so stupid that it may
not be feasable to do anything about it.

hope that helps, t.
Received on Fri Jul 18 2003 - 01:53:54 UTC

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