7.0-STABLE, 7.1-BETA2 install CD kernel panic

[darthmarth37]

Hi,

When I go to boot the install CD for either 7.0-STABLE or 7.1-BETA2 I
get a kernel panic, regardless of which boot option (no ACPI, safe,
etc.) I choose.  Here's the panic message from 7.1-BETA2 (my apologies
for any typos; I'm retyping from a photograph):

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x3f80
fault code              = supervisor read, page not yet present
instruction pointer     = 0x20:0xc0a9fdb4
stack pointer           = 0x20:0xe6f52b5c
frame pointer           = 0x20:0xe6f52c58
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 2 (g_event)
trap number             = 12
panic: page fault

I don't have an existing BSD system from which to build a debug kernel,
but from a Linux system I found that this occurred in the "bcmp"
function, if that helps at all.

I'm using a P4 3.0, an Intel 915P chipset, 4 GB of RAM, an Nvidia
GeForce 6800 GT, and assorted PATA and SATA disk drives.  One thing to
note about this system is that it limits the amount of RAM it
initializes to 3200 MB.  This isn't the usual "I can only see 3.2 GB"
bit, but rather if I have more than that installed, it only bothers to
initialize exactly 3200 MB of it during POST.  Presumably this was
ASUS's way of dealing with the 32-bit barrier when they created this
mainboard (ASUS P5GD1).

Anything else I can do to help figure this out?