[CentOS] anaconda kernel parameter to load module

hi, how can i add kernel parameters to anaconda to load a module? in a normal booting initrd contains an init script so i can modify it load a given module (after i put it into the initrd). but in case of installer the initrd contains a binary init so i can't modify it. in this case how can i define kernel param (eg: through isolinux.cfg) to load additional modules? suppose i've got an xfs partition on which the installer reside and i use lilo to load the kernel and initrd, but after that the kernel can't read anything from the partition since it's not load xfs. is there any way to load kernel modules in this case trough kernel params (ie. append)? thanks.