boot option
inst.stage2=hd:sda1:/
inst.ks=hd:sda1:/path/xxx.ks
inside kickstart file
no need to specify installation source since inst.stage2 had been added to boot option
inst.dd -- driver package. can supply multiple driver package to boot option
please note, when booting with inst.ks and inst.dd options supplied at the same time, inst.ks could behave not as expected.