Messages in this thread Patch in this message | | | Date | Mon, 26 May 2003 11:21:38 +0200 (MEST) | From | mikpe@csd ... | Subject | Re: [RFC] Fix NMI watchdog documentation |
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On 26 May 2003 01:31:41 -0400, Disconnect <lkml@sigkill.net> wrote: >> OK, I put together a kernel that had the Latitude blacklist commented out, >> and it comes up with: >> >> No local APIC present or hardware disabled >> Initializing CPU#0 >> >> So add the Latitude C840 to the "known b0rken" list. > >Ditto the Inspiron 8500 - no apic at all (which is different from >known-broken, since nothing bad happened.) ... >Perhaps just a comment above those entries: >/* Latitude C840 and Inspiron 8500 have no APIC support in hardware */
If these machines are P4-based, then I bet they do have local APICs. However, if the BIOS boots the kernel with the local APIC disabled on a P4, we (apic.c) don't try to enable it. The logic behind that is that "modern" BIOSen _should_ boot with it enabled, unless they're horribly broken.
So apply the patch below and try the "can we get the machine to hang" checklist again.
/Mikael
--- linux-2.5.69/arch/i386/kernel/apic.c.~1~ 2003-04-20 13:08:15.000000000 +0200 +++ linux-2.5.69/arch/i386/kernel/apic.c 2003-05-26 11:11:19.000000000 +0200 @@ -617,7 +617,7 @@ goto no_apic; case X86_VENDOR_INTEL: if (boot_cpu_data.x86 == 6 || - (boot_cpu_data.x86 == 15 && cpu_has_apic) || + (boot_cpu_data.x86 == 15) || (boot_cpu_data.x86 == 5 && cpu_has_apic)) break; goto no_apic; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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