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Subject: Re: Bug in APIC on 2.4.20 kernel
From: "JP Pozzi izzop.org" <jp.pozzi@izzop.org>
Reply-To: jp.pozzi@izzop.org
To: Mikael Pettersson <mikpe@user.it.uu.se>
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <200303010032.h210WXgJ002912@harpo.it.uu.se>
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Date: 01 Mar 2003 23:42:18 +0100
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Hello,

I try the patch with no success, the kernel seems to be ok, but the
message at boot loops always "APIC CPU0 O4(04)".

Regards

JP Pozzi


> On 01 Mar 2003 00:18:46 +0100, "JP Pozzi izzop.org" wrote:
> >I found a problem with the APIC management in the 2.4.20 kernel.
> >
> >My system is (was) a bi-processor one :
> >
> >MSI K7D Master (BIOS V 1.1) with 2 ATHLON MP 1800+
> >
> >The facts :
> >
> >1) The 2.4.20 kernel was OK on my system with the 2 processors and a
> >home made SMP kernel.
> >
> >2) One processor was broken/defective.
> >
> >3) No boot was possible with only on processor on the card with a loop
> >while booting saying endlessly : "APIC 04(04)"
> >
> >I try to recompile the 2.4.20 kernel with no SMP support the problem was
> >the same, I try gcc2.95 and gcc3 without any success.
> 
> Known problem. It has been discussed extensively on LKML recently.
> Apply the patch below.
> 
> /Mikael
> 
> diff -ruN linux-2.4.21-pre5/arch/i386/kernel/apic.c linux-2.4.21-pre5.apic-fixes/arch/i386/kernel/apic.c
> --- linux-2.4.21-pre5/arch/i386/kernel/apic.c	2003-02-27 12:58:55.000000000 +0100
> +++ linux-2.4.21-pre5.apic-fixes/arch/i386/kernel/apic.c	2003-02-27 13:05:28.000000000 +0100
> @@ -649,7 +649,6 @@
>  	}
>  	set_bit(X86_FEATURE_APIC, &boot_cpu_data.x86_capability);
>  	mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
> -	boot_cpu_physical_apicid = 0;
>  	if (nmi_watchdog != NMI_NONE)
>  		nmi_watchdog = NMI_LOCAL_APIC;
>  
> @@ -1169,8 +1168,7 @@
>  
>  	connect_bsp_APIC();
>  
> -	phys_cpu_present_map = 1;
> -	apic_write_around(APIC_ID, boot_cpu_physical_apicid);
> +	phys_cpu_present_map = 1 << boot_cpu_physical_apicid;
>  
>  	apic_pm_init2();
>  
-- 
JP Pozzi izzop.org <jp.pozzi@izzop.org>

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