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From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Jan Kiszka <jan.kiszka@domain.hid>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-help] Linux kernel 2.6.32.14 and Xenomai 2.5.2 does not boot
Date: Thu, 03 Jun 2010 16:43:14 +0200	[thread overview]
Message-ID: <4C07BF82.90508@domain.hid> (raw)
In-Reply-To: <4C07BC21.1080907@domain.hid>

Jan Kiszka wrote:
> Gilles Chanteperdrix wrote:
>> Jan Kiszka wrote:
>>> Gilles Chanteperdrix wrote:
>>>> Daniele Nicolodi wrote:
>>>>> Booting a working 2.6.30 kernel I noticed this error message as first
>>>>> output on the console. Can it be related to my issue with more modern
>>>>> kernels and ipipe patches?
>>>>>
>>>>> ERROR: 8254 timer not connected to IO-APIC
>>>>>
>>>>> I have no idea of what it means.
>>>> Is APIC enabled in your kernel configuration?
>>> It likely is.
>>>
>>> I'm getting this error for many kernel releases now. It must be related
>>> to I-pipe's patching of the APIC or IO-APIC code. Irritating but mostly
>>> harmless.
>> What I mean is that when Xenomai wants to use the 8254 (which is the
>> case if the APIC is disabled in linux kernel configuration) and the 8254
>> has become unreachable by Linux by some change in recent versions,
>> Xenomai timing subystem becomes screwed up.
>>
>> When, on the other hand, Xenomai wants to use the APIC, the fact that
>> the 8254 has become unreachable is harmless.
> 
> ...but people continue to report this as bug.

But I am not sure this bug is related to Xenomai at all.


-- 
					    Gilles.


  reply	other threads:[~2010-06-03 14:43 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-06-01 11:02 [Xenomai-help] Linux kernel 2.6.32.14 and Xenomai 2.5.2 does not boot Daniele Nicolodi
2010-06-01 11:23 ` Jan Kiszka
2010-06-01 13:54   ` Daniele Nicolodi
2010-06-01 14:50     ` Jan Kiszka
2010-06-01 16:15       ` Daniele Nicolodi
2010-06-01 16:32         ` Jan Kiszka
2010-06-02  6:58           ` Jan Kiszka
2010-06-03 13:11             ` Daniele Nicolodi
2010-06-03 13:21               ` Daniele Nicolodi
2010-06-03 13:37                 ` Gilles Chanteperdrix
2010-06-03 13:59                   ` Jan Kiszka
2010-06-03 14:07                     ` Gilles Chanteperdrix
2010-06-03 14:28                       ` Jan Kiszka
2010-06-03 14:43                         ` Gilles Chanteperdrix [this message]
2010-06-03 14:47                           ` Jan Kiszka
2010-06-09 14:40                         ` Daniele Nicolodi

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