Fatal trap 12 when installing with floppies

[Giotto Pozza]

Hi, guys!

The situation is: I'm getting the infamous message of "Fatal Trap 12 -
Page fault while in kernel mode" while I am trying to install FreeBSD
5.4 (and that also happened then I was trying to install 5.3 to the
same machine before, I don't remember how I solved it) to an IBM
Pentium 100 machine, 32 RAM. This box has no support for CDROM boot,
then I have made the three boot floppies from the 5.4 floppies on
FreeBSD ftp.

I downloaded the archives (I'm at a Linux Slack 10.1 now), then:

#dd if=boot.flp of=/dev/fd0

And did it with the two another files. Ok, then I booted the machine
with the boot floppy, then kern1.flp, kern2.flp, and then boot.flp
again. No matter what option I choose on FreeBSD boot menu (the one
with the ASCII daemon), I get the following Trap 12:

------------------------------------
(Last line from dmesg before trap 12)

vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0

Fatal trap 12: page fault while in kernel mode
fault virtual address  = 0xe
fault code                  = supervisor read, page not present
instruction pointer     = 0x8:0xc0626d48
stack pointer             = 0x10:0xc1020bc8
frame pointer            = 0x10:0xc1020bc8
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        = 0 (swapper)
trap number              = 12
panic: page fault
Uptime 1s
Automatic reboot in 12 seconds - press a key on the console to abort

---------------------

What should I do? Thank you in advance!

Silvio