Date: Wed, 4 Jun 2014 10:36:37 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-current@freebsd.org Cc: Edward Tomasz =?utf-8?q?Napiera=C5=82a?= <trasz@freebsd.org> Subject: Re: "CPU0: local APIC error 0x40" Message-ID: <201406041036.37413.jhb@freebsd.org> In-Reply-To: <D0664455-A1D7-4886-A32F-B004CAD92630@FreeBSD.org> References: <D0664455-A1D7-4886-A32F-B004CAD92630@FreeBSD.org>
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On Monday, June 02, 2014 5:32:13 pm Edward Tomasz Napierała wrote:
> Some machines, including ThinkPad T61, emit the following error message
> early during boot:
>
> CPU0: local APIC error 0x40
>
> The message itself doesn't seem to be much of a problem. However,
> every once in a while booting hangs just before that line. I've tracked
> that down to call to AcpiHwWritePort() at
> sys/contrib/dev/acpica/components/hardware/hwacpi.c:117:
>
> switch (Mode)
> {
> case ACPI_SYS_MODE_ACPI:
>
> /* BIOS should have disabled ALL fixed and GP events */
>
> Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand,
> (UINT32) AcpiGbl_FADT.AcpiEnable, 8);
>
> Any idea what might be going on?
This is probably triggering an SMI# to enter SMM mode where your BIOS does
God-knows-what but apparently triggers one of the local APIC local interrupts
while it is configured with an invalid vector (e.g. 0).
--
John Baldwin
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