does anyone have Xen running on an AMD system?

[Sergey G Nasonov]

I am sorry for intrusion. I have the same problem (pmap_init) running FreeBSD 8.2 r217259 i386 PV mode on Citrix XenServer 5.6. The server is IBM x3650 with intel Xeon 5405 

cpu_count                : 4
                   vendor: GenuineIntel
                    speed: 1995.001
                modelname: Intel(R) Xeon(R) CPU           E5405  @ 2.00GHz
                   family: 6
                    model: 23
                 stepping: 6
                    flags: fpu de tsc msr pae mce cx8 apic sep mtrr mca cmov pat clflush acpi mmx fxsr sse sse2 ss ht constant_tsc pni vmx ssse3 sse4_1
                 features: 000ce33d-bfebfbff-00000001-20000800
    features_after_reboot: 000ce33d-bfebfbff-00000001-20000800
        physical_features: 000ce33d-bfebfbff-00000001-20000800
                 maskable: base

WARNING: loader(8) metadata is missing!
GDB: no debug ports present
KDB: debugger backends: ddb
KDB: current backend: ddb
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FreeBSD 8.2-PRERELEASE #4: Wed Jan 12 13:30:44 MSK 2011
    root at fbsd8x32.bcc.:/usr/obj/usr/src/sys/XEN i386
WARNING: WITNESS option enabled, expect reduced performance.
panic: pmap_init: page table page is out of range
cpuid = 0
KDB: enter: panic
[thread pid 0 tid 0 ]
Stopped at      0xc010ab0a:     movl    $0,0xc03e6f74
db> 
db> 
db> 


FreeBSD VM has 1GB memory. And this problem does not appear when I reduce amount of RAM to 512 MB. 
Unfortunately, currently I dont have any servers with AMD Opteron CPU to test.

-- 
Best Regards,
Nasonov Sergey