NMI ISA 2c, EISA ff

[Alex Keda]

I try install FreBSD; boot from USB hard drive on HP 2133 (laptop)
Boot not success:

agp0: <VIA 3364 (P4M900) host to PCI bridge> on host0
agp0: aperture size is 128M
NMI ISA 2c, EISA ff
NMI ... going to debugger
[thread pid0 tid 100000 ]
Stopped at pmap_remove+0x158: testl %eax,%eax
db>

If I do not unplug hard drive - reboot with 2-3 seconds
If unplug - not reboot, but, 'db>' go to down - kind of press enter
(~10-20 seconds period)
System - i386, GENERIC, from yesterday sources