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Setup UEFI Bios Legacy / UEFI mode to boot

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How to setup a UEFI bios to boot in legacy mode boot (Chameleon)




It's best just to reset all of your UEFI settings to their factory defaults. Once your UEFI is running on its defaults, you will have to change the following settings:

Boot Option Priorities - Change "Boot Option #1" to your USB drive. You need to do this for the pen to boot.

Mac OS X cannot boot if you set the boot option to anything that starts with "UEFI". Instead, you must select the boot option that starts with "P0", "SATA", or "Legacy" (depending on your motherboard).




xHCI Mode - Change this to "Auto". This setting is usually set to "Smart Auto", which doesn't work.




xHCI Hand-off / EHCI Hand-off - Make sure both of these settings are enabled.




Asus Setup










How to setup a UEFI bios to boot in UEFI mode boot (Clover)




1 - "UEFI Hitachi" line allows to boot the HDD in UEFI mode,

2 - "P1: Hitachi" line allows to boot the HDD in Legacy (not-EFI) mode,

3 - "P3: DVD" line allows to boot from DVD drive in Legacy mode

4 - "UEFI: USB" line allows to boot the USB in UEFI mode.

Here is a 2nd example of BIOS, simpler, where the "Boot Mode" parameter allows one to choose the boot mode ("UEFI" or "Legacy") for all media (hard disk, CD, USB...) at the same time.





"Secure Boot" is a new UEFI feature that appeared in 2012, with Windows8 preinstalled computers. So it's possible that you may encounter problems booting under Secure Boot.

Disabling SecureBoot in the BIOS

Here is an example of BIOS showing that "Secure Boot" is enabled:



PB Easy Note TM 86 - i5 430 M - H55M - Ram - 6 GB - Alc272 - Radeon HD 5470 512 QE/CI

Lenovo G500 - i5 3230m - HM77 - Ram - 8 GB - Conexant audio - HD 4000

My OS X Files 

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