FW: IBM / FreeBSD - Install Update - Seems to be ACPI

[John Baldwin]

On Thursday 19 April 2007 12:33:08 am Murray Taylor wrote:
> 
> In our initial posts, we stated that we seemed to be having issues
> getting the machine to boot with the 4 processors, so to bypass this we
> disabled ACPI on boot. This allowed us to get past the CPU error and
> continue to boot. However down the track we noticed things like the
> ethernet adapater not getting picked up, and the big problem - none of
> the disks getting recognised.
> 
> We have since tried a few things, one of which was removing all but one
> of the CPU's. If we do this, and boot with ACPI enabled, all is totally
> fine. All disks are found, and I receive no CPU panic error.

Yes, ACPI enumerates Host-PCI bridges, and trying to enumerate them w/o ACPI 
is a bit of a guessing game.

> So it appears to me that by disabling ACPI in an attempt to bypass the
> QUAD CPU problem, we are causing another issue behind the scenes.
> 
> The root of the problem now appears to be, that if we have anything over
> 1 CPU, directly after the kernel is loaded (when booting from the CD),
> we receive the error message "panic: madt_probe_cpus_handler: CPU ID 38
> Too High". The moment a second CPU to the machine....it bombs out.

You can use 'set hint.apic.0.disabled=1' for now to keep ACPI and just disable 
SMP for now.

-- 
John Baldwin