hp pb4520s: appleahciqueuemanager : : setpowerstate ... Still waiting for root device

[mosi]

i'm trying install osx on HP probook 4520s, i5-460m ATI Radeon mobility 4300/4500 , no GMA and no switchable graphic. i tried lot's of boot flags but always in verbose mode ends in :
DSMOS has arrived
no interval found for . using 8000000
still waiting for root device
i tried this flags: hp debug=8 ahcidisk=1
then it went further to this stage:
appleahciqueuemanager : : setpowerstate (0xffffff80082f0800, 2 -> 1) async took 132 ms
Still waiting for root device
whats going on? any solution?