freebsd raid problem

[Sein_Schatten at gmx.net]

hi.
i have installed freebsd on a partition on my hd. but i have a it8212 chip and 
4 devices plugged onto it and cant afford to have the hd with freebsd on ide0 
(ide1&2 are via it8212). i have to unplug all hds before freebsd is able to 
boot. if i have one hd on an ide with it8212 it has problems finding the 
kernel. and when i switch the hd back and use grub to point to the kernel the 
freebsd loader wont recognize the hd and wont boot.
i found this link 
http://www.xl0.org/FreeBSD/13-12-04.html#ite-it8212f-gigabyte-raid-controller-supported
is it possible with that to successfully boot freebsd? how to optain that 
source and use it? wont i have to patch the kernel?