Asus P8P67 Pro - UEFI or BIOS ??

Hi, not a real pro with Hacks but have successfully been running Yosemite on my Asus motherboard for quite some time. However upon trying to migrate to El Capitan using Clover (as per Tonymac guide) I am unable to boot from a USB if I have chosen UEFI boot mode when buiulding my unibeast drive, which I presumed was correct as the P8P67 is UEFI ? However using a legacy USB I am able to boot from this. Does anyone know why I cant boot from a UEFI usb drive ?? Thanks

Silly question, but....did you enable UEFI boot in your BIOS?

Hi thanks for reply. Yes uefi is set in bios ?

lavertyg, sorry I don't know the answer, but I have had the same experience with my Asus P8H61-M Pro. I think that the 67 board has the more advanced chipset, so obviously that's not the answer. I also found that building the USB with legacy mode was the only way to boot into the installer. Can't boot to anything using the UEFI partition.

I did manage to install El Capitan into a spare partition though and I have spent probably some 12 hours over the last two days experimenting with the EFI on my OSX HDD using various flags and also that latest version of Clover. I managed to get to a point where I could boot Yosemite, but not El Capitan nor my Windows 7 or Windows 10 partition.

One of the errors I get is the system hanging at Error allocating...pages messages. In the Clover FAQ on their WiKi is states that this is because 'Your EFI variant does not work natively with Clover.' It then advises to 'Use one of the available drivers to fix your EFI memory map. I have tried using both OsxAptioFix2.efi and OsxAptioFix.efi. I think the latter worked better but I had problems with both.

I am beginning to think that Asus motherboards are not yet compatible?

lavertyg, I have spent the most part of the last 3 days experimenting and have finally got El Capitan to boot from my P8H61-M Pro board using UEFI boot. It took a combination of things to get there, but I think the key thing was to replace the OsxAptioFix2Drv-64.efi driver with OsxAptioFixDrv-64.efi.

With my setup I also needed to add dart=0 to the boot flags. I also had the AppleRTC, AsusAICPUPM and KernelPm patches set. The autodetection for my Nvidia Graphics card reported 2 ports whereas my card has 3 so I changed this to 3. Since I had also created a clean EFI on my OSX HDD using the latest Clover installer, I found that it was important to have NullCPUPowerManagement.kext and FakeSMC.kext in EFI/CLOVER/kexts. It wouldn't boot without them. I also needed RealtekRTL8111.kext to get the network adapter working.

Of course, the USB drive installer already has these kexts, so once I had finished experimenting, I just copied OsxAptioFixDrv-64.efi into Drivers64UEFI and renamed OsxAptioFix2Drv-64.efi. UEFI booting now works from the USB stick.

At this point I still haven't got it booting my Windows partitions though but at least I can now boot both Yosemite and El Capitan via UEFI with Clover.