Couldn't unmount disk - EFI Boot Problem

[Cyon]

Hi All, just discovered this forum so i  just wanted to document my findings regarding Skylake and Asus Maximus VIII Hero.

 

I managed to boot to OSX desktop using 14,2 profile from clover configurator with NO other options. However i can only manage to install via USB, thats to say, i had to slave my SSD with a sata to usb converter, and use my bootable clover EFI on a USB stick to reach the OSX installer.

El Capitan desktop can only be reached after the initial install with the bootable USB stick still connected and with the SSD connected via sata to usb converter, and only after the automatic reboot that occurs after successful OSX install.

Now i presume this occurs because there is an EFI partition active before (and thus after) the restart so it boots off it? I have tried creating an exclusive EFI partition on the SSD by installing Clover and when that didn't work, i swapped out the Clover folder with the one from my bootable USB (this guide explains how at point 5), however the BIOS still never sees an UEFI partition on the SSD, slaved via my converter or connected as disk 1 on the internal sata channel.

Not sure what i'm doing wrong, but there must be a way that i can boot off the EFI on my SSD?
I believe this has something to do the "unable to unmount disk" error i run into whenever trying to install with my SSD connected to SATA1 and hence i was forced to install El Capitan with the sata 2 USB converter.

I have removed my GFX cards out the equation... both 980's are detached and im using the onboard Intel HD graphics via HDMI, if that helps anyone. Will continue to update for others trying to successfully build with the same setup. 

Thanks!

[Dwarfy]

Hi I suggest you get on the chat and talk to Stehor, zxv or Badeendje. They know a lot about Skylake.  You can try Stehor's config if you want. 

 

https://www.dropbox.com/s/ofsi99tpgre9erf/Stehor%27s%20Skylake%20config.zip?dl=0