[coyotos-dev] Coyotos SMP?

[Jonathan S. Shapiro]

On Sun, 2007-10-21 at 02:35 +0200, Valerio Bellizzomi wrote:
> This is the current status of my tests:
> 
> 1. Mainboards that trigger the cpu_ncpu assert:
> 	- ASUS P4C800 mainboard with one P4 with HT enabled.
> 	- GIGABYTE P4 TITAN mainboard with one P4 with HT enabled.
> 
> 2. Mainboards that bootstrap successfully:
> 	- ABIT BP-6 mainboard with *two* old Celeron CPUs mounted on-board.
> 	- Laptop ACER Travelmate with Pentium III.
> 	- ECS K7S5A mainboard with Athlon.
> 
> So, the cpu_ncpu assert is triggered on P4 with HT, where the ACPI reports
> 2 CPUs. It doesn't trigger on Dual Celeron, but I have not checked how
> many CPUs are reported by ACPI on the BP-6 mainboard.

I think that I know what is happening. Your newer motherboards [1] have
ACPI bios, so Coyotos is detecting multiple CPUs. Your older
motherboards [2] probably have the intel SMP extensions but not ACPI. We
don't support the older SMP tables (yet), so the second CPU is never
detected. Does this seem like a plausible explanation?

I have switched us to use IOAPIC by default, and I have removed the
asserts from various places. That should help.
-- 
Jonathan S. Shapiro, Ph.D.
Managing Director
The EROS Group, LLC
www.coyotos.org, www.eros-os.org