Instant crash with FreeBSD 6.1-RC and 4GB RAM

[Francois Tigeot]

Hello,

I just tried booting a FreeBSD-6.1-RC1/amd64 CD in a machine with an
Athlon-64 X2 4400+ and 4GB of memory.

The mainboard is an Asus A8V-E-SE.

The kernel displays its copyright and then crashes almost instantly. The
screen is filled with the letter 'k' and the machine reboots soon after
that.

Here is a copy of the verbose boot messages (transcripted by hand):

SMAP type=01 base=0000000000000000 len=000000000009f400
SMAP type=02 base=00000000000f0000 len=0000000000010000
SMAP type=02 base=00000000fec00000 len=0000000001400000
SMAP type=02 base=00000000e0000000 len=0000000010000000
SMAP type=03 base=00000000afee3000 len=000000000000d000
SMAP type=04 base=00000000afee0000 len=0000000000003000
SMAP type=02 base=000000000009f400 len=0000000000000c00
SMAP type=02 base=00000000afef0000 len=0000000000010000
SMAP type=01 base=0000000000100000 len=00000000afde0000
SMAP type=01 base=0000000100000000 len=0000000050000000
Copyright (c) 1992-2006 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD 6.1-RC1 #0: Mon Apr 10 20:16:14 UTC 2006
    root at bloom.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC

(crash here)

If the memory is limited to 3GB in the BIOS, FreeBSD boots as expected.

I would appreciate if someone could share some insight about this problem.

TIA,

-- 
Francois Tigeot