Re: [patch] SMP fixes 2.2.1

MOLNAR Ingo (mingo@chiara.csoma.elte.hu)
Mon, 1 Feb 1999 20:41:34 +0100 (CET)


On Mon, 1 Feb 1999, Rik van Riel wrote:

> > > Well, my Intel Neptune board with dual P120 doesn't reboot
> > > with 2.2, but it did reboot with Linux 2.0 (according to
> > > the previous owner).
> >
> > Ditto mine with a dual P90 - specifically if I say "noapic" it can reboot
> > if I let it run APIC mode it cannot. It appears to be a BIOS problem.
>
> I seem to remember a "disabling symmetric mode" message
> and several others from the linux-kernel mailing list.

does it happen with the attached patch too? (we have a problem i did not
want to solve until 2.3 but we might have to)

Ingo

--- linux/arch/i386/kernel/io_apic.c.orig Tue Dec 29 16:37:07 1998
+++ linux/arch/i386/kernel/io_apic.c Mon Feb 1 20:42:55 1999
@@ -793,10 +799,12 @@
*/
void init_pic_mode(void)
{
+#if 0
printk("disabling symmetric IO mode... ");
outb_p(0x70, 0x22);
outb_p(0x00, 0x23);
printk("...done.\n");
+#endif
}

char ioapic_OEM_ID [16];

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