It's a common problem to many user but no one asked this in here. I'm installing High Sierra Zone on a i5+H61(Intel Original board) machine which is running Yosemite well. I can reach language selection menu smoothly with Chameleon, but either installer itself or Disk Utility can only see the USB drive not the internal HDD.
BIOS setting is AHCI
Tried with empty or pre-formatted HDD with GUID and HFS+ (journaled).
There is a rumor of using AHCIPortInjector.kext.
But no idea where to get it or how to use it.