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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: <linuxppc-dev@lists.linuxppc.org>,
	<yellowdog-devel@lists.yellowdoglinux.com>,
	"Kevin B. Hendricks" <kevin.hendricks@sympatico.ca>
Subject: Re: question: "disabling IRQ 54 defensively?"
Date: Sun, 17 Feb 2002 22:53:40 +0100	[thread overview]
Message-ID: <20020217215340.10006@smtp.wanadoo.fr> (raw)
In-Reply-To: <20020217203742.VCID12383.tomts9-srv.bellnexxia.net@there>


>
>Later on I see the following:
>
>ide0 "blah" on irq 19
>ide1 "blah" on irq 20
>ide2 0x440-0x447, 0x432 on irq 54
>ide3 0x420-0x427, 0x412 on irq 54
>
>Should I be worried here?  What does the disabling IRQ 54 defensively mean?
>
>Is it wrong to have two ide devices with the ssame irq?  Are they just
>sharing it?

They are just charing it, nothing wrong

>Any info would be greatly appreciated.

The message means that the IRQ was detected as beeing shared and so disabled
during IDE probe. This is normal behaviour and is done to avoid the machine
locking up under some cicumstances, for example with PCMCIA ATA cards that
share their interrupt with the cardbus controller.

Ben.


** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/

  reply	other threads:[~2002-02-17 21:53 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-02-13  1:08 new G4 dual 1 gig is here - how to install? Kevin B. Hendricks
2002-02-13  1:20 ` Tony 'Nicoya' Mantler
2002-02-13  1:55 ` Kevin B. Hendricks
2002-02-13  8:00   ` Olaf Hering
2002-02-13 13:49     ` Kevin B. Hendricks
2002-02-14  2:29   ` Kevin B. Hendricks
2002-02-14  3:53     ` Ani Joshi
2002-02-15 11:08       ` Kevin B. Hendricks
2002-02-16  9:30         ` Kevin B. Hendricks
2002-02-16 14:44           ` SMP kernel configuration question? Kevin B. Hendricks
2002-02-16 19:26             ` Benjamin Herrenschmidt
2002-02-16 15:39           ` SMP kernel seems to work fine Kevin B. Hendricks
2002-02-16 19:24           ` new G4 dual 1 gig is here - how to install? Benjamin Herrenschmidt
2002-02-14 13:53   ` Kevin B. Hendricks
2002-02-14 18:08     ` benh
2002-02-14 19:31       ` Christopher C. Chimelis
2002-02-13  2:25 ` Tom Rini
2002-02-13  5:37 ` Olaf Hering
2002-02-16  2:24 ` Kevin B. Hendricks
2002-02-16 19:19   ` Benjamin Herrenschmidt
2002-02-17 18:22     ` radeonfb.c flakiness Kevin B. Hendricks
2002-02-17 21:51       ` Benjamin Herrenschmidt
2002-02-18 20:55         ` Kevin B. Hendricks
2002-02-19  0:04           ` Benjamin Herrenschmidt
2002-02-16 23:59   ` question on best way to install other ide drives? Kevin B. Hendricks
2002-02-17  0:11     ` Tom Rini
2002-02-17 20:16     ` Timothy A. Seufert
2002-02-17 20:38       ` question: "disabling IRQ 54 defensively?" Kevin B. Hendricks
2002-02-17 21:53         ` Benjamin Herrenschmidt [this message]
2002-02-18  2:17         ` Final question: best wasy to move /, /usr, /home, etc? Kevin B. Hendricks
2002-02-18  2:36           ` Bastien Nocera
2002-02-18 16:16             ` Tom Rini
2002-02-18 16:20               ` Bastien Nocera
2002-02-18  3:12           ` Jeramy B. Smith
2002-02-18  8:42           ` Giuliano Pochini
2002-02-18 14:52             ` Derrik Pates
2002-02-18 15:05               ` Gabriel Paubert
2002-02-18 23:18                 ` Michael Heironimus
2002-02-18 17:31             ` David A. Gatwood
2002-02-17 21:52       ` question on best way to install other ide drives? Benjamin Herrenschmidt
2002-02-17 23:19         ` Tom Rini
2002-02-16  2:40 ` Weird bug problems with timing of NIC driver loading? Kevin B. Hendricks
2002-02-16 19:22   ` Benjamin Herrenschmidt

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