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Xen 4.8.0 and NetBSD 7.1?

Yesteday,  I tried to update my system running Xen 3.3.2 (yes,
very old) to 4.8.0.  Unfortunately, it wouldn't fully boot.  If
I was lucky, it would make it to probing the disks.  If I was
unlucky, it only made it to the ACPI probe.

An interesting message that I'd not seen before is:
  (XEN) Platform timer appears to have unexpectedly wrapped 10 or more times.

It appeared during the boot process of the NetBSD kernel.

A similar message has appeared running Xen 4.6.5 (but only
wrapping once, and during the Xen initialization.)

The system is a SUN X2200M2, 2 core AMD Opteron 2210 with
20479MB RAM.

I was able to successfully boot using both Xen 4.5.5 and Xen
4.6.5. (And is currently running under Xen 4.6.5)

FYI: the system hasn't been able to boot a NetBSD GENERIC kernel
since around NetBSD 3 (I think)  Fortunately, running on the Xen
hypervisor provides sufficent abstraction to (normally) keep it
from hanging at the ACPI probe.  But that's a different problem.

I've attached the boot log file, showing 3 failed attempts at
booting Xen 4.8.0, and one each attempt at booting Xen 4.5.5 and
Xen 4.6.5.

Thank you,
	Eric Schnoebelen

Eric Schnoebelen		eric%cirr.com@localhost 		http://www.cirr.com
  The most likely way for the world to be destroyed, most experts agree,
  is by accident. That's where we come in. We're computer professionals.
      We cause accidents.  ---Nathaniel Borenstein, inventor of MIME.
[ Failing boot of Xen 4.8.0 with NetBSD 7.1, hangs at ACPI identification ]

     1. Boot NetBSD/xen
     2. Boot NetBSD/xen (single user)
     3. Boot NetBSD/xen (backup, single user)
     4. Boot NetBSD/xen (backup, single user)
     5. Boot normally
     6. Boot single user
     7. Disable ACPI
     8. Disable ACPI and SMP
     9. Drop to boot prompt

Choose an option; RETURN for default; SPACE to stop countdown.
Option 2 will be chosen in 5 seconds. 4 seconds. 3 seconds. 2 seconds. 1 seconds. 0 seconds. 0 seconds.     
WARNING: couldn't open ffs (//ffs/ffs.kmod)
Loading /netbsd-xen 
WARNING: 1 module failed to load
 Xen 4.8.0
(XEN) Xen version 4.8.0 (root@) (gcc (nb2 20150115) 4.8.5) debug=n  Tue Aug  1 14:31:17 CDT 2017
(XEN) Latest ChangeSet: 
(XEN) Bootloader: unknown
(XEN) Command line: dom0_mem=1024M console=com1 com1=9600,8n1
(XEN) Video information:
(XEN)  VGA is text mode 80x25, font 8x16
(XEN)  VBE/DDC methods: none; EDID transfer time: 1 seconds
(XEN)  EDID info not retrieved because no DDC retrieval method detected
(XEN) Disc information:
(XEN)  Found 3 MBR signatures
(XEN)  Found 3 EDD information structures
(XEN) Xen-e820 RAM map:
(XEN)  0000000000000000 - 000000000009fc00 (usable)
(XEN)  000000000009fc00 - 00000000000a0000 (reserved)
(XEN)  00000000000e4000 - 0000000000100000 (reserved)
(XEN)  0000000000100000 - 00000000dfff0000 (usable)
(XEN)  00000000dfff0000 - 00000000dfffe000 (ACPI data)
(XEN)  00000000dfffe000 - 00000000e0000000 (ACPI NVS)
(XEN)  00000000e0000000 - 00000000f0000000 (reserved)
(XEN)  00000000fec00000 - 00000000fec01000 (reserved)
(XEN)  00000000fee00000 - 00000000fef00000 (reserved)
(XEN)  00000000ff780000 - 0000000100000000 (reserved)
(XEN)  0000000100000000 - 0000000520000000 (usable)
(XEN) ACPI: RSDP 000F9710, 0024 (r2 ACPIAM)
(XEN) ACPI: XSDT DFFF0100, 004C (r1 A M I  OEMXSDT  11000715 MSFT       97)
(XEN) ACPI: FACP DFFF0290, 00F4 (r3 A M I  OEMFACP  11000715 MSFT       97)
(XEN) ACPI: DSDT DFFF04A0, 4AEF (r1  S39_3 S39_3B25      B25 INTL 20051117)
(XEN) ACPI: APIC DFFF0390, 0076 (r1 A M I  OEMAPIC  11000715 MSFT       97)
(XEN) ACPI: SPCR DFFF0410, 0050 (r1 A M I  OEMSPCR  11000715 MSFT       97)
(XEN) ACPI: OEMB DFFFE040, 0060 (r1 A M I  AMI_OEM  11000715 MSFT       97)
(XEN) ACPI: SRAT DFFF4F90, 00C8 (r1 AMD    HAMMER          1 AMD         1)
(XEN) System RAM: 20479MB (20971068kB)
(XEN) Domain heap initialised
(XEN) IOAPIC[0]: apic_id 2, version 17, address 0xfec00000, GSI 0-23
(XEN) Enabling APIC mode:  Flat.  Using 1 I/O APICs
(XEN) Using scheduler: SMP Credit Scheduler (credit)
(XEN) Platform timer is 3.579MHz ACPI PM Timer
(XEN) Detected 1809.289 MHz processor.
(XEN) Initing memory sharing.
(XEN) AMD-Vi: IOMMU not found!
(XEN) I/O virtualisation disabled
(XEN)  -> Using new ACK method
(XEN) spurious 8259A interrupt: IRQ7.
(XEN) CPU0: No irq handler for vector e7 (IRQ -8)
(XEN) IRQ7 a=0001[0001,0000] v=50[ffffffff] t=IO-APIC-edge s=00000002
(XEN) Allocated console ring of 16 KiB.
(XEN) HVM: ASIDs disabled.
(XEN) SVM: Supported advanced features:
(XEN)  - none
(XEN) HVM: SVM enabled
(XEN) HVM: Hardware Assisted Paging (HAP) not detected
(XEN) AMD: Disabling C1 Clock Ramping Node #0
(XEN) microcode: CPU1 not a capable AMD processor
(XEN) Brought up 2 CPUs
(XEN) CPUIDLE: disabled due to no HPET. Force enable with 'cpuidle'.
(XEN) Dom0 has maximum 400 PIRQs
(XEN)  Xen  kernel: 64-bit, lsb, compat32
(XEN)  Dom0 kernel: 64-bit, lsb, paddr 0xffffffff80000000 -> 0xffffffff80e61000
(XEN)  Dom0 symbol map 0xffffffff80e61000 -> 0xffffffff80f98d20
(XEN)  Dom0 alloc.:   000000050e000000->0000000510000000 (253952 pages to be allocated)
(XEN)  Loaded kernel: ffffffff80000000->ffffffff80f98d20
(XEN)  Init. ramdisk: ffffffff80f99000->ffffffff80f99000
(XEN)  Phys-Mach map: ffffffff80f99000->ffffffff81199000
(XEN)  Start info:    ffffffff81199000->ffffffff811994b4
(XEN)  Page tables:   ffffffff8119a000->ffffffff811a7000
(XEN)  Boot stack:    ffffffff811a7000->ffffffff811a8000
(XEN)  TOTAL:         ffffffff80000000->ffffffff81400000
(XEN)  ENTRY ADDRESS: ffffffff80100000
(XEN) Dom0 has maximum 2 VCPUs
(XEN) Scrubbing Free RAM on 1 nodes using 2 CPUs
(XEN) ..................................................................................done.
(XEN) Initial low memory virq threshold set at 0x4000 pages.
(XEN) Std. Loglevel: Errors and warnings
(XEN) Guest Loglevel: Nothing (Rate-limited: Errors and warnings)
(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch input to Xen)
(XEN) Freed 300kB init memory
Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
    2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017
    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 7.1_STABLE (XEN3_DOM0) #18: Wed Jul 19 18:06:20 CDT 2017
total memory = 1024 MB
avail memory = 976 MB
mainbus0 (root)
ACPI: RSDP 0xf9710 000024 (v02 ACPIAM)
ACPI: XSDT 0xdfff0100 00004C (v01 A M I  OEMXSDT  11000715 MSFT 00000097)
ACPI: FACP 0xdfff0290 0000F4 (v03 A M I  OEMFACP  11000715 MSFT 00000097)
ACPI: DSDT 0xdfff04a0 004AEF (v01  S39_3 S39_3B25 00000B25 INTL 20051117)
ACPI: FACS 0xdfffe000 000040
ACPI: APIC 0xdfff0390 000076 (v01 A M I  OEMAPIC  11000715 MSFT 00000097)
ACPI: SPCR 0xdfff0410 000050 (v01 A M I  OEMSPCR  11000715 MSFT 00000097)
ACPI: OEMB 0xdfffe040 000060 (v01 A M I  AMI_OEM  11000715 MSFT 00000097)
ACPI: SRAT 0xdfff4f90 0000C8 (v01 AMD    HAMMER   00000001 AMD  00000001)
ACPI: All ACPI Tables successfully acquired
ioapic0 at mainbus0 apid 2
cpu0 at mainbus0 apid 0
cpu1 at mainbus0 apid 1
ipmi0 at mainbus0
hypervisor0 at mainbus0: Xen version 4.8.0
vcpu0 at hypervisor0: Dual-Core AMD Opteron(tm) Processor 2210, id 0x40f12
xenbus0 at hypervisor0: Xen Virtual Bus Interface
xencons0 at hypervisor0: Xen Virtual Console Driver
acpi0 at hypervisor0: Intel ACPICA 20131218
(XEN) Platform timer appears to have unexpectedly wrapped 10 or more times

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