Xen unstable fails to boot from cold on i386 core duo

["Daniel P. Berrange" <berrange@redhat.com>]

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Just testing xen-unstable on some of my machines here. I've got a failure
to boot on a Mac Mini with a i386 Core Duo cpu.

If I try to boot xen-unstable changeset 16606 from cold it will immediately
crash with this:

  http://people.redhat.com/berrange/xen-3.2.0-fail.jpg

Sorry for lame camera pic - this being a mac mini there's no serial card,
or even ability to add one in :-(

If I boot into Xen 3.1.0 it works fine. If I warm-reboot from Xen 3.1.0
into Xen-unstable changeset 16606 it also works fine. So it seems only the
boot from cold is problematic.

Attaching the 'xm dmesg' output from a succesfull warm-reboot into 
xen-unstable, and the CPU info. 

Any ideas / suggestions ?

Dan.
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[-- Attachment #2: hv.log --]
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 __  __            _____  ____    ___              ____                    
 \ \/ /___ _ __   |___ / |___ \  / _ \    _ __ ___|___ \    _ __  _ __ ___ 
  \  // _ \ '_ \    |_ \   __) || | | |__| '__/ __| __) |__| '_ \| '__/ _ \
  /  \  __/ | | |  ___) | / __/ | |_| |__| | | (__ / __/|__| |_) | | |  __/
 /_/\_\___|_| |_| |____(_)_____(_)___/   |_|  \___|_____|  | .__/|_|  \___|
                                                           |_|             
(XEN) Xen version 3.2.0-rc2-pre (berrange@home.berrange.com) (gcc version 4.1.2 20070925 (Red Hat 4.1.2-33)) Sat Dec 15 13:05:31 EST 2007
(XEN) Latest ChangeSet: unavailable
(XEN) Command line: 
(XEN) Video information:
(XEN)  VGA is text mode 80x25, font 8x16
(XEN)  VBE/DDC methods: none; EDID transfer time: 0 seconds
(XEN)  EDID info not retrieved because no DDC retrieval method detected
(XEN) Disc information:
(XEN)  Found 1 MBR signatures
(XEN)  Found 1 EDD information structures
(XEN) Xen-e820 RAM map:
(XEN)  0000000000000000 - 000000000009fc00 (usable)
(XEN)  000000000009fc00 - 00000000000a0000 (reserved)
(XEN)  00000000000ede00 - 0000000000100000 (reserved)
(XEN)  0000000000100000 - 000000003e0d5000 (usable)
(XEN)  000000003e0d5000 - 000000003e2d6000 (ACPI NVS)
(XEN)  000000003e2d6000 - 000000003eebf000 (ACPI data)
(XEN)  000000003eebf000 - 000000003eeef000 (ACPI NVS)
(XEN)  000000003eeef000 - 000000003ef00000 (ACPI data)
(XEN)  000000003ef00000 - 0000000040000000 (reserved)
(XEN)  00000000e0000000 - 00000000f0000000 (reserved)
(XEN)  00000000fec00000 - 00000000fec01000 (reserved)
(XEN)  00000000fed14000 - 00000000fed1a000 (reserved)
(XEN)  00000000fed1c000 - 00000000fed20000 (reserved)
(XEN)  00000000fee00000 - 00000000fee01000 (reserved)
(XEN)  00000000ffe00000 - 0000000100000000 (reserved)
(XEN) System RAM: 992MB (1016272kB)
(XEN) Xen heap: 9MB (10080kB)
(XEN) Domain heap initialised: DMA width 32 bits
(XEN) PAE enabled, limit: 16 GB
(XEN) Processor #0 6:14 APIC version 20
(XEN) Processor #1 6:14 APIC version 20
(XEN) IOAPIC[0]: apic_id 1, version 32, address 0xfec00000, GSI 0-23
(XEN) Enabling APIC mode:  Flat.  Using 1 I/O APICs
(XEN) Using scheduler: SMP Credit Scheduler (credit)
(XEN) Detected 1833.347 MHz processor.
(XEN) HVM: VMX enabled
(XEN) CPU0: Intel Genuine Intel(R) CPU            1400  @ 1.83GHz stepping 08
(XEN) Booting processor 1/1 eip 8c000
(XEN) CPU1: Intel Genuine Intel(R) CPU            1400  @ 1.83GHz stepping 08
(XEN) Total of 2 processors activated.
(XEN) ENABLING IO-APIC IRQs
(XEN)  -> Using new ACK method
(XEN) Platform timer overflows in 14998 jiffies.
(XEN) Platform timer is 14.318MHz HPET
(XEN) Brought up 2 CPUs
(XEN) AMD IOMMU: Disabled
(XEN) *** LOADING DOMAIN 0 ***
(XEN)  Xen  kernel: 32-bit, PAE, lsb
(XEN)  Dom0 kernel: 32-bit, PAE, lsb, paddr 0xc1000000 -> 0xc1401000
(XEN) PHYSICAL MEMORY ARRANGEMENT:
(XEN)  Dom0 alloc.:   000000003a000000->000000003c000000 (225331 pages to be allocated)
(XEN) VIRTUAL MEMORY ARRANGEMENT:
(XEN)  Loaded kernel: c1000000->c1401000
(XEN)  Init. ramdisk: c1401000->c1c61800
(XEN)  Phys-Mach map: c1c62000->c1d460cc
(XEN)  Start info:    c1d47000->c1d47474
(XEN)  Page tables:   c1d48000->c1d5d000
(XEN)  Boot stack:    c1d5d000->c1d5e000
(XEN)  TOTAL:         c0000000->c2000000
(XEN)  ENTRY ADDRESS: c1000000
(XEN) Dom0 has maximum 2 VCPUs
(XEN) Initrd len 0x860800, start at 0xc1401000
(XEN) Scrubbing Free RAM: done.
(XEN) Xen trace buffers: disabled
(XEN) Std. Loglevel: Errors and warnings
(XEN) Guest Loglevel: Nothing (Rate-limited: Errors and warnings)
(XEN) Xen is relinquishing VGA console.
(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch input to Xen)
(XEN) Freed 96kB init memory.

[-- Attachment #3: cpu.log --]
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processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 14
model name	: Genuine Intel(R) CPU            1400  @ 1.83GHz
stepping	: 8
cpu MHz		: 1833.347
cache size	: 2048 KB
fdiv_bug	: no
hlt_bug		: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 6
wp		: yes
flags		: fpu de tsc msr pae mce cx8 apic mtrr mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc pni monitor vmx est tm2 xtpr
bogomips	: 3668.66
clflush size	: 64

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 6
model		: 14
model name	: Genuine Intel(R) CPU            1400  @ 1.83GHz
stepping	: 8
cpu MHz		: 1833.347
cache size	: 2048 KB
fdiv_bug	: no
hlt_bug		: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 6
wp		: yes
flags		: fpu de tsc msr pae mce cx8 apic mtrr mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc up pni monitor vmx est tm2 xtpr
bogomips	: 3668.66
clflush size	: 64


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