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SubjectRe: Bug in APIC on 2.4.20 kernel
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();

-
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