Fatal trap 9 on -BETA1 on boot "with ACPI disabled" or "Safe Mode":

[Gonzalo Nemmi]

Can reproduce it on -CURRENT-200906 and -BETA1 whenever I try to boot "with
ACPI disabled" or "Safe Mode":

Fatal trap 9: general protection fault while in kernel mode
cpuid = 0; acpic id = 00
instruction pointer        = 0x70:0xbfe4
stack pointer            = 0x28:0xfa4
frame pointer            = 0x28:0xfd4
code segment            = base 0xc00f0000, limit 0xffff, type 0x1b
                = DPL 0, pres 1, def32 0, gran 0
processor eflags        = interrupt enabled, resume, IOPL = 0
current process            = 0 (swapper)
[thread pid 0 tid 100000 ]
Stopped at      0xbfe4: *** error reading from address bfe4 ***
db> bt
Tracing pid 0 tid 100000 td 0x0da9b50
uart_z8530_class(780001,0,b0202,ffe,0,...) at 0xbfe4
db>

more info at http://forums.freebsd.org/showthread.php?t=4988

verbose boot: http://pastebin.com/f604c1399

Willing to do everything I can to solve it.

Best regards
Gonzalo