loader stopped working

[Niki Denev]

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I've just upgraded 2 machines to -current from 6.2-stable.
Both are intel chipsets with c2d cpus, but one is with adaptec
U160 controller and the other is with areca pcie sata raid card.
Both fail to boot with the /boot/loader in -current, but work ok
if i boot with the old loader /boot/loader.old

Here is the message that i get on one of the machine (i think it is
the same on the other, but will check later because i don't have
access to it right now) :

BTX loader 1.00  BTX version is 1.01
Consoles: internal video/keyboard
BIOS drive C: is disk0
BIOS 639kB/2095680kB available memory


FreeBSD/i386 bootstrap loader, Revision 1.1
(ndenev at ndenev.totalterror.net, Thu Aug  2 01:42:28 EEST 2007)
Loading /boot/defaults/loader.conf
Consoles: internal video/keyboard
BIOS drive C: is disk0
BIOS 639kB/2095680kB available memory

FreeBSD/i386 bootstrap loader, Revision 1.1
(ndenev at ndenev.totalterror.net, Thu Aug  2 01:42:28 EEST 2007)
Can't work out which disk we are booting from.
Guessed BIOS device 0xffffffff not found by probes, defaulting to disk0:
panic: free: guard1 fail @ 0x6e224 from
/usr/src/sys/boot/i386/loader/../../common/module.c:958
- --> Press a key on the console to reboot <--
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