Your report seems kinda confusing, you said it doesnt boot but you said its reported as Unknown or Jmicron?
Also I dont know how are your BIOS' settings but there is not Legacy AHCI mode, either its in AHCI mode or IDE mode, the latter can be either Native or Legacy. If you switch on legacy mode your most likely disabling AHCI and making the ICH work as IDE.
Try removing all of the ICH drivers you have installed, any AHCI controller should work with vanilla driver (AppleAHCIport.kext), even though without proper identification in System Profiler but functionatily should be the same.