problem on dell r610

[Mark Davies <mark%ecs.vuw.ac.nz@localhost>]

I have a Dell PowerEdge r610 running 5.1_RC4/amd64 GENERIC happily 
(initial part of dmesg included below) but if I try to boot XEN3_DOM0 
(with the xen 3.3.2 xenkernel) it dies very quickly with the 
following backtrace:

breakpoint()
panic()
cpu_attach()
config_attach_loc()
mpacacpi_config_cpu()
acpi_madt_walk()
mpacpi_scan_apics()
mainbus_attach()
config_attach_loc()
cpu_configure()
main()

a very similar machine tripped over the problem fixed in r1.11 of 
src/sys/arch/x86/x86/intel_busclock.c when I first got that box so 
maybe some similar but xen specific issue?

NetBSD 5.1_RC4 (GENERIC) #2: Thu Sep 16 11:28:25 NZST 2010
        
mark%turakirae.ecs.vuw.ac.nz@localhost:/local/SAVE/amd64.obj/src/work/5/src/sys/arch/amd64/compile/GENERIC
total memory = 8182 MB
avail memory = 7917 MB
timecounter: Timecounters tick every 10.000 msec
timecounter: Timecounter "i8254" frequency 1193182 Hz quality 100
SMBIOS rev. 2.6 @ 0xcf79c000 (84 entries)
Dell Inc. PowerEdge R610
mainbus0 (root)
cpu0 at mainbus0 apid 32/src/work/5/src/sys/arch/x86/x86/mtrr_i686.c: 
FIXME: more than 8 MTRRs
: Intel 686-class, 2660MHz, id 0x206c2
cpu1 at mainbus0 apid 34: Intel 686-class, 2660MHz, id 0x206c2
cpu2 at mainbus0 apid 50: Intel 686-class, 2660MHz, id 0x206c2
cpu3 at mainbus0 apid 52: Intel 686-class, 2660MHz, id 0x206c2
ioapic0 at mainbus0 apid 0: pa 0xfec00000, version 20, 24 pins
ioapic1 at mainbus0 apid 1: pa 0xfec80000, version 20, 24 pins


cheers
mark