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From: "Manfred Spraul" <manfred@colorfullife.com>
To: <pf-kernel@mirkwood.net>
Cc: <linux-kernel@vger.kernel.org>
Subject: Kernel 2.4.2 - kernel BUG at apic.c:220!
Date: Sat, 24 Feb 2001 19:45:43 +0100
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> kernel BUG at apic.c:220!
>From apic.c:
<<<<<<<<<<<

        /*
         * Double-check wether this APIC is really registered.
         */
        if (!test_bit(GET_APIC_ID(apic_read(APIC_ID)),
&phys_cpu_present_map))
                BUG();
>>>>>>>>>>>
Really odd. That's usually a sign of a bad MP table.

Could you check your BIOS settings for an entry MP, or MPS, or
Multiprocessor Table?
Usually the options are 1.1 and 1.4 - just try the other one.

or try the attached patch - it prints 2 additional debug lines.

--
    Manfred



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--- linux/arch/i386/kernel/apic.c.old	Tue Dec 05 21:43:48 2000
+++ linux/arch/i386/kernel/apic.c	Sat Feb 24 19:39:44 2001
@@ -216,8 +216,13 @@
 	/*
 	 * Double-check wether this APIC is really registered.
 	 */
-	if (!test_bit(GET_APIC_ID(apic_read(APIC_ID)), &phys_cpu_present_map))
+	if (!test_bit(GET_APIC_ID(apic_read(APIC_ID)), &phys_cpu_present_map)) =
{
+		printk(KERN_ERR "phys_cpu_present_map is %lxh.\n",
+					phys_cpu_present_map);
+		printk(KERN_ERR "Apic id is %ldh.\n",
+				GET_APIC_ID(apic_read(APIC_ID)));
 		BUG();
+	}
=20
 	/*
 	 * Intel recommends to set DFR, LDR and TPR before enabling

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