I just got a Dell Inspiron 7352 i7-5500u Broadwell HD5500 1920×1080 2-1 laptop for my daughter. Turned it into a MacBook Air and it worked perfectly with El Capitan, Yosemite and macOS Sierra. It has Realtek ALC255 sound card. This is how to patch AppleHDA. 1. Use original AppleHDA.kext and AppleALC released version installed to /System/Library/Extensions
To get the Yosemite to work perfectly is to get the speed steps and turbo working by generate SSDT for our system. The only program that works is ssdtPRGen.sh written by Piker-Alpha. The newest version at the moment is V15.2. There is a problem that the SSDT got stuck at 800 MHz. I tried different scenarios and
Before installing OSX onto Windows PC or Laptops, check the device ids for compatibility and extract dsdt and ssdt(s). Download RWeverything.