On Mon, 2003-05-12 at 17:54, Dave Hansen wrote:
> john stultz wrote:
> > I've been having problems with ACPI on a box here in our lab. Some of
> > our more recent hardware requires that SMIs are routed through the
> > IOAPIC, thus when we clear_IO_APIC() at boot time, we clear the BIOS
> > initialized SMI pin. This basically clobbers the SMI so we can then
> > never make the transition into ACPI mode.
> >
> > This patch simply reads the apic entry in clear_IO_APIC to make sure the
> > delivery_mode isn't dest_SMI. If it is, we leave the apic entry alone
> > and return.
> >
> > With this patch, the box boots and SMIs function properly.
>
> So, without the patch, what happens? Does the thing just completely
> freeze when it tries to turn ACPI on? Does the machine _require_ that
> you use ACPI?
When trying to boot w/ ACPI the transition fails and the box hobbles
along to different degrees. Normally the interrupt routing is bad and a
scsi or network card fails to init.
Without ACPI the system boots fine. SMIs are still clobbered, but
they're less critical.
But really, ACPI (and SMIs) should "just work". ;)
thanks
-john
-
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/
This archive was generated by hypermail 2b29 : Thu May 15 2003 - 22:00:42 EST