IBM x336 does not boot with APIC.

[Jung-uk Kim]

I tried to install FreeBSD 6.1-BETA4 on IBM x336 and it was not 
booting.  I googled a bit and I found this is known problem for this 
platform:

http://docs.freebsd.org/cgi/mid.cgi?200510061556.55464.jhb

To make the system up and running, I had to disable APIC and force 
keyboard to attach.  Of course, I didn't like that. ;-)

The first thing I wanted to fix was:

acpi0: <IBM SERONYXP> on motherboard
acpi0: [MPSAFE]
pci_open(1):    mode 1 addr port (0x0cf8) is 0x80000144
pci_open(1a):   mode1res=0x80000000 (0x80000000)
pci_cfgcheck:   device 0 [class=060000] [hdr=80] is there 
(id=35908086)
acpi_bus_number: root bus has no _BBN, assuming 0
acpi_bus_number: can't get _ADR
acpi_bus_number: can't get _ADR
...

I added 'PNP0A08' to pcib_ids in src/sys/dev/acpica/acpi_pcib_acpi.c 
because this system had this:

    Scope (\_SB)
    {
        Device (PCI0)
        {
            Name (_HID, EisaId ("PNP0A08"))
            Name (_CID, 0x030AD041)
...

This ID was added in ACPI 3.0 as 'PCI Express Root Bridge', instead of 
'PNP0A03', which is PCI/PCI-X root bridge.  However, I got something 
like this instead:

acpi0: could not allocate interrupt
    ACPI-0210: *** Error: Unable to install System Control Interrupt 
Handler, AE_ALREADY_EXISTS
acpi0: Could not enable ACPI: AE_ALREADY_EXISTS

No driver was able to allocate IRQ after this and I am quite puzzled 
right now.  Is it correct thing to do?  Why does it break?  Why can't 
I install SCI handler?

Jung-uk Kim