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Date:      Wed, 27 Nov 1996 22:41:45 +0100 (MET)
From:      Janick.Taillandier@ratp.fr (Janick TAILLANDIER)
To:        freebsd-smp@freebsd.org
Subject:   IO APIC mode on Dell Optiplex
Message-ID:  <199611272141.WAA14477@minos.noisy.ratp>

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Hello,

I am using a Dell Optiplex GXpro. Until recently this machine 
would not work with :

options	APIC_IO

defined in the kernel configuration file because this machine does not
connect the 8254 clock to the IO APIC. As a result you get the following
message during boot:

APIC missing 8254 connection
panic(cpu#0)

Recent updates now allow this configuration to work.
All you have to do is to uncomment the line :

#define IRQ_LO_NC

in sys/i386/include/smptests.h. Et voila ! Everything works great 
after that.

Once it is known to be working on several machines it will become the
default action.  If your motherboard experiences this panic, please
report the results of using this option to smp@freebsd.org.

I wish to thank Steve Pass for his code and help with this
special case.

Janick Taillandier



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