I am built a NetBSD -HEAD image as of yesterday, using the XEN3_DOM0 config
(except that I've changed the NFS boot option flags to be DHCP, not static).
When I try to boot that image diskless, I get timeouts in the kernel DHCP
client. I can see with a sniffer that the packets are getting to the box, and
I can boot a straight (non-Xen) NetBSD kernel diskless in the same setup, so
the problem appears to be that the NICs are not actually receiving the packets
properly (an interrupt problem?). I have this problem with both a fxp and a
wm - have not yet tried other NICs.

  Could anyone suggest a fix or how to debug this further?

  Thanks,

									-Craig

root (nd)
 Filesystem type is tftp, using whole disk
kernel /xen/xen.gz dom0_mem=131072 com1=38400,8n1 noacpi
   [Multiboot-elf, <0x100000:0x6f250:0x2ddb0>, shtab=0x19d078, entry=0x100000]
module /xen/netbsd-xen0
   [Multiboot-module @ 0x19e000, 0x88b6e2 bytes]

 __  __            _____  ___   ____  
 \ \/ /___ _ __   |___ / / _ \ |___ \ 
  \  // _ \ '_ \    |_ \| | | |  __) |
  /  \  __/ | | |  ___) | |_| | / __/ 
 /_/\_\___|_| |_| |____(_)___(_)_____|
                                      
 http://www.cl.cam.ac.uk/netos/xen
 University of Cambridge Computer Laboratory

 Xen version 3.0.2 (xenod@cl.cam.ac.uk) (gcc version 3.3.3 20040412 (Red Hat Linux 3.3.3-7)) Fri Apr  7 12:32:08 BST 2006
 Latest ChangeSet: Thu Apr  6 18:34:32 2006 +0100 9595:32b22f5286be

(XEN) Physical RAM map:
(XEN)  0000000000000000 - 000000000009f800 (usable)
(XEN)  000000000009f800 - 00000000000a0000 (reserved)
(XEN)  00000000000f0000 - 0000000000100000 (reserved)
(XEN)  0000000000100000 - 000000003fff0000 (usable)
(XEN)  000000003fff0000 - 000000003fff3000 (ACPI NVS)
(XEN)  000000003fff3000 - 0000000040000000 (ACPI data)
(XEN)  00000000fec00000 - 0000000100000000 (reserved)
(XEN) System RAM: 1023MB (1048124kB)
(XEN) Xen heap: 10MB (10600kB)
(XEN) Using scheduler: Simple EDF Scheduler (sedf)
(XEN) PAE disabled.
(XEN) found SMP MP-table at 000f5d60
(XEN) DMI 2.2 present.
(XEN) Using APIC driver default
(XEN) ACPI: RSDP (v000 IntelR                                ) @ 0x000f78f0
(XEN) ACPI: RSDT (v001 IntelR AWRDACPI 0x42302e31 AWRD 0x00000000) @ 0x3fff3000
(XEN) ACPI: FADT (v001 IntelR AWRDACPI 0x42302e31 AWRD 0x00000000) @ 0x3fff3040
(XEN) ACPI: MADT (v001 IntelR AWRDACPI 0x42302e31 AWRD 0x00000000) @ 0x3fff7a40
(XEN) ACPI: DSDT (v001 INTELR AWRDACPI 0x00001000 MSFT 0x0100000e) @ 0x00000000
(XEN) ACPI: Local APIC address 0xfee00000
(XEN) ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
(XEN) Processor #0 15:2 APIC version 20
(XEN) ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] enabled)
(XEN) Processor #1 15:2 APIC version 20
(XEN) ACPI: LAPIC_NMI (acpi_id[0x00] high edge lint[0x1])
(XEN) ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1])
(XEN) ACPI: IOAPIC (id[0x02] address[0xfec00000] gsi_base[0])
(XEN) IOAPIC[0]: apic_id 2, version 32, address 0xfec00000, GSI 0-23
(XEN) ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
(XEN) ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
(XEN) ACPI: IRQ0 used by override.
(XEN) ACPI: IRQ2 used by override.
(XEN) ACPI: IRQ9 used by override.
(XEN) Enabling APIC mode:  Flat.  Using 1 I/O APICs
(XEN) Using ACPI (MADT) for SMP configuration information
(XEN) Initializing CPU#0
(XEN) Detected 2793.058 MHz processor.
(XEN) CPU: Trace cache: 12K uops, L1 D cache: 8K
(XEN) CPU: L2 cache: 512K
(XEN) CPU: Physical Processor ID: 0
(XEN) Intel machine check architecture supported.
(XEN) Intel machine check reporting enabled on CPU#0.
(XEN) CPU0: Intel P4/Xeon Extended MCE MSRs (12) available
(XEN) CPU0: Thermal monitoring enabled
(XEN) CPU0: Intel(R) Pentium(R) 4 CPU 2.80GHz stepping 05
(XEN) Booting processor 1/1 eip 90000
(XEN) Initializing CPU#1
(XEN) CPU: Trace cache: 12K uops, L1 D cache: 8K
(XEN) CPU: L2 cache: 512K
(XEN) CPU: Physical Processor ID: 0
(XEN) Intel machine check architecture supported.
(XEN) Intel machine check reporting enabled on CPU#1.
(XEN) CPU1: Intel P4/Xeon Extended MCE MSRs (12) available
(XEN) CPU1: Thermal monitoring enabled
(XEN) CPU1: Intel(R) Pentium(R) 4 CPU 2.80GHz stepping 05
(XEN) Total of 2 processors activated.
(XEN) ENABLING IO-APIC IRQs
(XEN) ..TIMER: vector=0x31 apic1=0 pin1=2 apic2=-1 pin2=-1
(XEN) checking TSC synchronization across 2 CPUs: passed.
(XEN) Platform timer is 1.193MHz PIT
(XEN) Brought up 2 CPUs
(XEN) Machine check exception polling timer started.
(XEN) Using IPI Shortcut mode
(XEN) *** LOADING DOMAIN 0 ***
(XEN) PHYSICAL MEMORY ARRANGEMENT:
(XEN)  Dom0 alloc.:   3e000000->3f000000 (28672 pages to be allocated)
(XEN) VIRTUAL MEMORY ARRANGEMENT:
(XEN)  Loaded kernel: c0100000->c0920c18
(XEN)  Init. ramdisk: c09cf000->c09cf000
(XEN)  Phys-Mach map: c09cf000->c09ef000
(XEN)  Start info:    c09ef000->c09f0000
(XEN)  Page tables:   c09f0000->c09f4000
(XEN)  Boot stack:    c09f4000->c09f5000
(XEN)  TOTAL:         c0000000->c0c00000
(XEN)  ENTRY ADDRESS: c0100000
(XEN) Dom0 has maximum 2 VCPUs
(XEN) Scrubbing Free RAM: ...........done.
(XEN) Xen trace buffers: disabled
(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch input to Xen).
pmap_mem_end find: old update failed 00000000
Loaded initial symtab at 0xc0920c1c, strtab at 0xc0979e00, # entries 22738
Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
    The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 3.99.22 (XEN3_DOM0) #0: Tue Jul 18 03:57:09 UTC 2006
        root@netbsd-current:/usr/src/sys/arch/i386/compile/XEN3_DOM0
total memory = 128 MB
avail memory = 115 MB
mainbus0 (root)
cpu0 at mainbus0: (uniprocessor)
cpu0: Intel Pentium 4 (686-class), 2793.00 MHz, id 0xf25
cpu0: features bfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR>
cpu0: features bfebfbff<PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX>
cpu0: features bfebfbff<FXSR,SSE,SSE2,SS,HTT,TM,SBF>
cpu0: I-cache 12K uOp cache 8-way, D-cache 8 KB 64B/line 4-way
cpu0: L2 cache 512 KB 64B/line 8-way
cpu0: ITLB 4K/4M: 64 entries
cpu0: DTLB 4K/4M: 64 entries
cpu0: 16 page colors
hypervisor0 at mainbus0
debug virtual interrupt using event channel 1
xenbus0 at hypervisor0: Xen Virtual Bus Interface
xencons0 at hypervisor0: Xen Virtual Console Driver
xencons0: console major 143, unit 0
xencons0: using event channel 2
npx0 at hypervisor0: using exception 16
pci0 at hypervisor0 bus 0: configuration mode 1
pci0: i/o space, memory space enabled
pchb0 at pci0 dev 0 function 0
pchb0: Intel 82875P Host (rev. 0x02)
agp0 at pchb0: aperture at 0xf6000000, size 0x400000
ppb0 at pci0 dev 1 function 0: Intel 82875P AGP (rev. 0x02)
pci1 at ppb0 bus 1
pci1: i/o space, memory space enabled
vga0 at pci1 dev 0 function 0: NVIDIA GeForce2 MX 100/200 (rev. 0xb2)
wsdisplay0 at vga0 kbdmux 1
wsmux1: connecting to wsdisplay0
wsdisplay0: screen 0-3 added (80x25, vt100 emulation)
ppb1 at pci0 dev 3 function 0: Intel 82875P PCI-CSA Bridge (rev. 0x02)
pci2 at ppb1 bus 2
pci2: i/o space, memory space enabled
wm0 at pci2 dev 1 function 0: Intel i82547GI 1000BASE-T Ethernet, rev. 0
wm0: interrupting at irq 15, event channel 3
wm0: Communication Streaming Architecture
wm0: 64 word (6 address bits) MicroWire EEPROM
wm0: Ethernet address 00:50:8d:f9:7f:1f
igphy0 at wm0 phy 1: Intel IGP01E1000 Gigabit PHY, rev. 0
igphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 1000baseT-FDX, auto
ppb2 at pci0 dev 30 function 0: Intel 82801BA Hub-PCI Bridge (rev. 0xc2)
pci3 at ppb2 bus 3
pci3: i/o space, memory space enabled
V3 Semiconductor product 0x0002 (miscellaneous communications, revision 0x05) at pci3 dev 7 function 0 not configured
fxp0 at pci3 dev 9 function 0: i82559 Ethernet, rev 8
fxp0: interrupting at irq 11, event channel 4
fxp0: Ethernet address 00:90:27:8c:0f:b7
inphy0 at fxp0 phy 1: i82555 10/100 media interface, rev. 4
inphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
pcib0 at pci0 dev 31 function 0
pcib0: Intel 82801EB LPC Interface Bridge (rev. 0x02)
Intel 82801EB/ER SMBus Controller (SMBus serial bus, revision 0x02) at pci0 dev 31 function 3 not configured
isa0 at pcib0
pckbc0 at isa0 port 0x60-0x64
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0 mux 1
wskbd0: connecting to wsdisplay0
pms0 at pckbc0 (aux slot)
pckbc0: using irq 12 for aux slot
wsmouse0 at pms0 mux 0
Xen clock: using event channel 7
crypto: assign driver 0, flags 2
crypto: driver 0 registers alg 1 flags 0 maxoplen 0
crypto: driver 0 registers alg 2 flags 0 maxoplen 0
crypto: driver 0 registers alg 3 flags 0 maxoplen 0
crypto: driver 0 registers alg 4 flags 0 maxoplen 0
crypto: driver 0 registers alg 5 flags 0 maxoplen 0
crypto: driver 0 registers alg 17 flags 0 maxoplen 0
crypto: driver 0 registers alg 6 flags 0 maxoplen 0
crypto: driver 0 registers alg 7 flags 0 maxoplen 0
crypto: driver 0 registers alg 15 flags 0 maxoplen 0
crypto: driver 0 registers alg 8 flags 0 maxoplen 0
crypto: driver 0 registers alg 16 flags 0 maxoplen 0
crypto: driver 0 registers alg 9 flags 0 maxoplen 0
crypto: driver 0 registers alg 10 flags 0 maxoplen 0
crypto: driver 0 registers alg 13 flags 0 maxoplen 0
crypto: driver 0 registers alg 14 flags 0 maxoplen 0
crypto: driver 0 registers alg 11 flags 0 maxoplen 0
crypto: driver 0 registers alg 18 flags 0 maxoplen 0
raidattach: Asked for 8 units
Kernelized RAIDframe activated
xenbus0: using event channel 8
Searching for RAID components...
boot device: <unknown>
root device: fxp0
dump device: 
file system (default generic): 
root on fxp0
mountroot: trying ffs...
mountroot: trying nfs...
nfs_boot: trying DHCP/BOOTP
fxp0: device timeout
nfs_boot: timeout...
fxp0: device timeout
nfs_boot: timeout...
fxp0: device timeout
nfs_boot: timeout...
fxp0: device timeout
mountroot: trying msdos...
mountroot: trying cd9660...
no file system for fxp0
cannot mount root, error = 79
root device (default fxp0): wm0
dump device: 
file system (default generic): 
root on wm0
mountroot: trying ffs...
mountroot: trying nfs...
nfs_boot: trying DHCP/BOOTP
nfs_boot: timeout...
nfs_boot: timeout...
nfs_boot: timeout...
mountroot: trying msdos...
mountroot: trying cd9660...
no file system for wm0
cannot mount root, error = 79
root device (default wm0):