I'm trying to run a recent-CURRENT XEN i386 kernel in a Xen 4.2 PV domU. 

I had to add the following options to the kernel config file in order to 
compile the XEN kernel:

makeoptions     WITHOUT_MODULES+="mlx4 mlx4ib mlxen mthca"

The resulting kernel compiles, but fails to boot. Attached is the log. Any 


root@six:/home/elars# xl create -c pvm-freebsd.cfg 
Parsing config from pvm-freebsd.cfg
Daemon running with PID 5230
WARNING: loader(8) metadata is missing!
GDB: no debug ports present
KDB: debugger backends: ddb
KDB: current backend: ddb
APIC: Using the MPTable enumerator.
SMP: Added CPU 0 (BSP)
Copyright (c) 1992-2013 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 10.0-CURRENT #22 2be0e12-dirty: Mon Sep  9 11:10:21 CEST 2013
FreeBSD clang version 3.3 (tags/RELEASE_33/final 183502) 20130610
WARNING: WITNESS option enabled, expect reduced performance.
Xen reported: 3000.224 MHz processor.
CPU: Intel(R) Xeon(R) CPU           E5240  @ 3.00GHz (3000.22-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0x1067a  Family = 0x6  Model = 0x17  Stepping = 
  AMD Features=0x20100000<NX,LM>
  AMD Features2=0x1<LAHF>

Instruction TLB: 4 KB Pages, 4-way set associative, 128 entries
1st-level instruction cache: 32 KB, 8-way set associative, 64 byte line size
1st-level data cache: 32 KB, 8-way set associative, 64 byte line size
L2 cache: 6144 kbytes, 16-way associative, 64 bytes/line
real memory  = 268435456 (256 MB)
Physical memory chunk(s):
0x000000000079f000 - 0x000000000fb23fff, 255348736 bytes (62341 pages)
avail memory = 253251584 (241 MB)
random device not loaded; using insecure entropy
ULE: setup cpu 0
Event-channel device installed.
null: <null device, zero device>
nfslock: pseudo-device
io: <I/O>
random: <Software, Yarrow> initialized
mem: <memory>
Pentium Pro MTRR support enabled
xc0: <Xen Console> on motherboard
xenstore0: <XenStore> on motherboard
Grant table initialized
xen_et0: <Xen PV Clock> on motherboard
xen_et0: Error 2 binding VIRQ_TIMER to VCPU 0
device_attach: xen_et0 attach returned 2
Device configuration finished.
procfs registered
panic: No usable event timer found!
cpuid = 0
KDB: enter: panic
[ thread pid 0 tid 100000 ]
Stopped at      kdb_enter+0x3d: movl    $0,kdb_why

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