[issue1802] AHCI timeouts on SMP APIC_IO system

[Matthew Dillon]

:New submission from Alex Hornung <ahornung at gmail.com>:
:
:When running an SMP kernel with APIC_IO on my ThinkPad T60, AHCI times out as 
:shown in the images below. I'm running master from about 8 hours ago.
:http://leaf.dragonflybsd.org/~alexh/ahci1.jpg
:http://leaf.dragonflybsd.org/~alexh/ahci2.jpg
:http://leaf.dragonflybsd.org/~alexh/ahci3.jpg
:http://leaf.dragonflybsd.org/~alexh/ahci4.jpg

    Looks like interrupt routing, meaning it might not work with APIC_IO
    but might work without, or with/without ACPI (which is the problem I
    am having on my test box).

    You can also try running with the emergency interrupt polling enabled
    to see if that allows the system to boot.  It isn't a solution but it
    will verify what the problem is.

					-Matt
					Matthew Dillon 
					<dillon at backplane.com>