I decided it would be a good idea to move a 4.0_BETA2 dom0 from under  
my desk to over with my other servers.

when i powered the machine back on after the move, the XEN3_DOM0  
kernel won't boot, it hangs at

uhci1 at pci0 dev 29 function 1: Intel 82801GB/GR USB UHCI Controller  
(rev. 0x01)

but a GENERIC kernel will boot through grub's 'chainloader' just fine.

i'd just say wipe the hard drives and start over, but this has domUs  
and data on it that i'd like to keep.  and the stupid thing /used/ to  
boot.

my / drive is small, of course.

nialas# df /
Filesystem  1K-blocks      Used     Avail Capacity  Mounted on
/dev/raid0a    508143    188655    294081    39%    /
nialas#

the dmesg from GENERIC is below.  any ideas?  thanks.
   --david


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 4.0_BETA2 (GENERIC) #0: Sun Feb 25 23:56:19 CST 2007
         dlg@build-40beta.dsrw.org:/local/src/netbsd-4/src/sys/arch/ 
i386/compile/obj/GENERIC
total memory = 3062 MB
avail memory = 2997 MB
timecounter: Timecounters tick every 10.000 msec
timecounter: Timecounter "i8254" frequency 1193182 Hz quality 100
mainbus0 (root)
cpu0 at mainbus0: (uniprocessor)
cpu0: Intel (686-class), 3000.03 MHz, id 0xf64
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: features2 e49d<SSE3,MONITOR,DS-CPL,EST,CID,xTPR>
cpu0: features3 20100000<XD,EM64T>
cpu0: "Intel(R) Pentium(R) D CPU 3.00GHz"
cpu0: I-cache 12K uOp cache 8-way
cpu0: L2 cache 2 MB 64B/line 8-way
cpu0: ITLB 4K/4M: 128 entries
cpu0: DTLB 4K/4M: 64 entries
cpu0: using thermal monitor 1
cpu0: 64 page colors
pci0 at mainbus0 bus 0: configuration mode 1
pci0: i/o space, memory space enabled, rd/line, rd/mult, wr/inv ok
pchb0 at pci0 dev 0 function 0
pchb0: Intel 82945G/P Memory Controller Hub (rev. 0x02)
agp0 at pchb0: detected 7932k stolen memory
agp0: aperture at 0xc0000000, size 0x10000000
vga1 at pci0 dev 2 function 0: Intel 82945G/P Integrated Graphics  
Device (rev. 0x02)
wsdisplay0 at vga1 kbdmux 1: console (80x25, vt100 emulation)
wsmux1: connecting to wsdisplay0
azalia0 at pci0 dev 27 function 0: Generic High Definition Audio  
Controller
azalia0: interrupting at irq 9
azalia0: host: Intel 82801GB/GR High Definition Audio Controller  
(rev. 1)
azalia0: host: High Definition Audio rev. 1.0
ppb0 at pci0 dev 28 function 0: Intel 82801GB/GR PCI Express Port #1  
(rev. 0x01)
pci1 at ppb0 bus 1
pci1: i/o space, memory space enabled, rd/line, wr/inv ok
wm0 at pci1 dev 0 function 0: Intel i82573E IAMT, rev. 3
wm0: interrupting at irq 11
wm0: PCI-Express bus
wm0: FLASH
wm0: Ethernet address 00:19:d1:26:26:d6
makphy0 at wm0 phy 1: Marvell 88E1111 Gigabit PHY, rev. 2
makphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT,  
1000baseT-FDX, auto
Intel product 0x108f (serial communications, interface 0x02, revision  
0x03) at pci1 dev 0 function 3 not configured
Intel product 0x108e (IPMI serial bus, interface 0x01, revision 0x03)  
at pci1 dev 0 function 4 not configured
ppb1 at pci0 dev 28 function 2: Intel 82801GB/GR PCI Express Port #3  
(rev. 0x01)
pci2 at ppb1 bus 2
pci2: i/o space, memory space enabled, rd/line, wr/inv ok
ppb2 at pci0 dev 28 function 3: Intel 82801GB/GR PCI Express Port #4  
(rev. 0x01)
pci3 at ppb2 bus 3
pci3: i/o space, memory space enabled, rd/line, wr/inv ok
ppb3 at pci0 dev 28 function 4: Intel 82801GB/GR PCI Express Port #5  
(rev. 0x01)
pci4 at ppb3 bus 4
pci4: i/o space, memory space enabled, rd/line, wr/inv ok
ppb4 at pci0 dev 28 function 5: Intel 82801GB/GR PCI Express Port #6  
(rev. 0x01)
pci5 at ppb4 bus 5
pci5: i/o space, memory space enabled, rd/line, wr/inv ok
uhci0 at pci0 dev 29 function 0: Intel 82801GB/GR USB UHCI Controller  
(rev. 0x01)
uhci0: interrupting at irq 9
usb0 at uhci0: USB revision 1.0
uhub0 at usb0
uhub0: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
uhci1 at pci0 dev 29 function 1: Intel 82801GB/GR USB UHCI Controller  
(rev. 0x01)
uhci1: interrupting at irq 11
usb1 at uhci1: USB revision 1.0
uhub1 at usb1
uhub1: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
uhci2 at pci0 dev 29 function 2: Intel 82801GB/GR USB UHCI Controller  
(rev. 0x01)
uhci2: interrupting at irq 10
usb2 at uhci2: USB revision 1.0
uhub2 at usb2
uhub2: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub2: 2 ports with 2 removable, self powered
uhci3 at pci0 dev 29 function 3: Intel 82801GB/GR USB UHCI Controller  
(rev. 0x01)
uhci3: interrupting at irq 11
usb3 at uhci3: USB revision 1.0
uhub3 at usb3
uhub3: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub3: 2 ports with 2 removable, self powered
ehci0 at pci0 dev 29 function 7: Intel 82801GB/GR USB EHCI Controller  
(rev. 0x01)
ehci0: interrupting at irq 9
ehci0: BIOS has given up ownership
ehci0: EHCI version 1.0
ehci0: companion controllers, 2 ports each: uhci0 uhci1 uhci2 uhci3
usb4 at ehci0: USB revision 2.0
uhub4 at usb4
uhub4: Intel EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
uhub4: 8 ports with 8 removable, self powered
ppb5 at pci0 dev 30 function 0: Intel 82801BA Hub-PCI Bridge (rev. 0xe1)
pci6 at ppb5 bus 6
pci6: i/o space, memory space enabled
fxp0 at pci6 dev 1 function 0: i82558 Ethernet, rev 5
fxp0: interrupting at irq 9
fxp0: May need receiver lock-up workaround
fxp0: Ethernet address 00:90:27:12:fd:b6
inphy0 at fxp0 phy 1: i82555 10/100 media interface, rev. 0
inphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
fwohci0 at pci6 dev 5 function 0: Texas Instruments TSB43AA23 IEEE  
1394 Host Controller (rev. 0x00)
fwohci0: interrupting at irq 10
fwohci0: OHCI version 1.10 (ROM=0)
fwohci0: No. of Isochronous channels is 4.
fwohci0: EUI64 00:90:27:00:01:bc:8a:19
fwohci0: Phy 1394a available S400, 3 ports.
fwohci0: Link S400, max_rec 2048 bytes.
ieee1394if0 at fwohci0: IEEE1394 bus
fwip0 at ieee1394if0: IP over IEEE1394
fwohci0: Initiate bus reset
pcib0 at pci0 dev 31 function 0
pcib0: Intel 82801GB/GR LPC Interface Bridge (rev. 0x01)
piixide0 at pci0 dev 31 function 1
piixide0: Intel 82801GB/GR IDE Controller (ICH7) (rev. 0x01)
piixide0: bus-master DMA support present
piixide0: primary channel configured to compatibility mode
piixide0: primary channel interrupting at irq 14
atabus0 at piixide0 channel 0
piixide0: secondary channel configured to compatibility mode
piixide0: secondary channel ignored (disabled)
piixide1 at pci0 dev 31 function 2
piixide1: Intel 82801GB/GR Serial ATA/Raid Controller (ICH7) (rev. 0x01)
piixide1: bus-master DMA support present
piixide1: primary channel configured to native-PCI mode
piixide1: using irq 11 for native-PCI interrupt
atabus1 at piixide1 channel 0
piixide1: secondary channel configured to native-PCI mode
atabus2 at piixide1 channel 1
Intel 82801GB/GR SMBus Controller (SMBus serial bus, revision 0x01)  
at pci0 dev 31 function 3 not configured
isa0 at pcib0
lpt0 at isa0 port 0x378-0x37b irq 7
com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
pckbc0 at isa0 port 0x60-0x64
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
attimer0 at isa0 port 0x40-0x43: AT Timer
pcppi0 at isa0 port 0x61
pcppi0: children must have an explicit unit
midi0 at pcppi0: PC speaker (CPU-intensive output)
sysbeep0 at pcppi0
isapnp0 at isa0 port 0x279: ISA Plug 'n Play device support
npx0 at isa0 port 0xf0-0xff
npx0: reported by CPUID; using exception 16
pcppi0: attached to attimer0
isapnp0: no ISA Plug 'n Play devices found
fwohci0: node_id=0xc800ffc0, gen=1, CYCLEMASTER mode
ieee1394if0: 1 nodes, maxhop <= 0, cable IRM = 0 (me)
ieee1394if0: bus manager 0 (me)
timecounter: Timecounter "clockinterrupt" frequency 100 Hz quality 0
azalia0: codec[2]: Sigmatel STAC9221 (rev. 50.1)
azalia0: codec[2]: High Definition Audio rev. 1.0
azalia0: playback: max channels=8, encodings=1<PCM>
azalia0: playback: PCM formats=e07e0<24bit,20bit,16bit,192kHz, 
176.4kHz,96kHz,88.2kHz,48kHz,44.1kHz>
azalia0: recording: max channels=4, encodings=1<PCM>
azalia0: recording: PCM formats=e07e0<24bit,20bit,16bit,192kHz, 
176.4kHz,96kHz,88.2kHz,48kHz,44.1kHz>
audio0 at azalia0: full duplex, independent
Kernelized RAIDframe activated
atapibus0 at atabus0: 2 targets
cd0 at atapibus0 drive 0: <LITE-ON LTR-16102C, , US52> cdrom removable
cd0: 32-bit data port
cd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2 (Ultra/33)
cd0(piixide0:0:0): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33)  
(using DMA)
wd0 at atabus1 drive 0: <ST3320620AS>
wd0: quirks 2<FORCE_LBA48>
wd0: drive supports 16-sector PIO transfers, LBA48 addressing
wd0: 298 GB, 620181 cyl, 16 head, 63 sec, 512 bytes/sect x 625142448  
sectors
wd0: 32-bit data port
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
wd1 at atabus1 drive 1: <ST3320620AS>
wd1: quirks 2<FORCE_LBA48>
wd1: drive supports 16-sector PIO transfers, LBA48 addressing
wd1: 298 GB, 620181 cyl, 16 head, 63 sec, 512 bytes/sect x 625142448  
sectors
wd1: 32-bit data port
wd1: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
wd0(piixide1:0:0): using PIO mode 4, Ultra-DMA mode 6 (Ultra/133)  
(using DMA)
wd1(piixide1:0:1): using PIO mode 4, Ultra-DMA mode 6 (Ultra/133)  
(using DMA)
wd2 at atabus2 drive 0: <ST3320620AS>
wd2: quirks 2<FORCE_LBA48>
wd2: drive supports 16-sector PIO transfers, LBA48 addressing
wd2: 298 GB, 620181 cyl, 16 head, 63 sec, 512 bytes/sect x 625142448  
sectors
wd2: 32-bit data port
wd2: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
wd2(piixide1:1:0): using PIO mode 4, Ultra-DMA mode 6 (Ultra/133)  
(using DMA)
raid0: RAID Level 1
raid0: Components: /dev/wd0p /dev/wd1p
raid0: Total Sectors: 625142272 (305245 MB)
boot device: raid0
root on raid0a dumps on raid0b
root file system type: ffs
wsdisplay0: screen 1 added (80x25, vt100 emulation)
wsdisplay0: screen 2 added (80x25, vt100 emulation)
wsdisplay0: screen 3 added (80x25, vt100 emulation)
wsdisplay0: screen 4 added (80x25, vt100 emulation)