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x86_64 UEFI + x86 32-bit Kernel and vice-versa config will not work. Note:В The below steps will not work if the system has been booted in BIOS mode and will not work if the UEFI processor architecture does not match the kernel one, i.e. This option is important as this is required to manipulate UEFI Runtime Variables using tools like efibootmgr.

UEFI Runtime Variables/Services Support - вЂefivarsвЂ™ kernel module. The required Linux Kernel configuration options for UEFI systems areВ : CONFIG_EFI=y UEFI Support in Linux Kernel Linux Kernel config options for UEFI x firmware as AppleвЂ™s EFI implementation is not fully compliant with UEFI Specification. If it returns EFI64 then it is x86_64 EFI 1. If the command returns EFI32 then it is i386 EFI 1.

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To find out the arch of the efi firmware in a Mac, boot into Mac OS X and type the following command ioreg -l -p IODeviceTree | grep firmware-abi

All macs capable of running Mac OS X Snow Leopard 64-bit Kernel have x86_64 EFI 1. Pre-2008 Macs mostly have i386-efi firmware while >=2008 Macs have mostly x86_64-efi. Some of the known systems using these firmwares are Asus EZ Mode BIOS (in Sandy Bridge P67 and H67 motherboards), MSI ClickBIOS, HP EliteBooks, Sony Vaio Z series, many Intel Server and Desktop motherboards Some of the known x86_64 UEFI 2.x firmwares are Phoenix SecureCore Tiano, AMI Aptio, Insyde H2O. If you have a non-mac UEFI system, then you have a x86_64 (aka 64-bit) UEFI 2.

UEFI application may launch another application (in case of UEFI Shell or a boot manager like rEFInd) or the kernel and initramfs (in case of a bootloader like GRUB) depending on how the UEFI application was configured.

Firmware launches the UEFI application from the FAT32 formatted UEFISYS partition as defined in the boot entry in the firmwareвЂ™s boot manager.

Firmware reads its Boot Manager to determine which UEFI application to be launched and from where (ie.

System switched on - Power On Self Test, or POST process.

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For the sake of Windows UEFI booting, the Linux bootloader used should also be installed in UEFI-GPT mode if booting from the same disk. This limitation does not exist in Linux Kernel but rather depends on the bootloader used. See ?scid=kb EN-US 2581408В for more info.

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Follow the instructions provided in the forum link given in the references sections as to how to do this. Windows 32-bit versions support only BIOS-MBR booting. Windows x86_64 versions support either UEFI-GPT booting or BIOS-MBR booting. But for this they need GPTВ partitioning of the disk used for UEFI booting. Windows Vista (SP1+) and 7 pr 8 x86_64 versions support booting natively using UEFI firmware. This removes the need for relying on chainloading mechanisms of one bootloader to load another to switch OSes. Since each OS or vendor can maintain its own files within the EFI SYSTEM PARTITION without affecting the other, multi-booting using UEFI is just a matter of launching a different UEFI application corresponding to the particular OSвЂ™s bootloader. Therefore the bootloader must be compiled for that architecture correctly. 10 firmware, and require i386 EFI applications.ДЄ x86_64 EFI firmware does not include support for launching 32-bit EFI apps unlike the 64-bit Linux and Windows which include such support. Note:В Some older Intel Server boards are known to operate on Intel EFI 1. Only some older macs use i386 EFI firmware while no non-Apple UEFI system is known to use i386 EFI firmware. Most of the UEFI firmware in the market, including recent Apple Macs use x86_64 EFI firmware. Under UEFI, every program whether they are OS loaders or some utilities (like memory testing apps) or recovery tools outside the OS, should be a UEFI Application corresponding to the EFI firmware architecture. An EFI System Partition is usually formatted as FAT32. Each vendor can store its files under /EFI// folder and can use the firmware or its shell (UEFI shell) to launch the boot program. Instead it uses a special partition in the partition table called В«EFI SYSTEM PARTITIONВ» in which files required to be launched by the firmware are stored.

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UEFI does not launch any boot code in the MBR whether it exists or not. EFI in Apple-Intel Macs can access HFS/HFS+ filesystems also apart from the mentioned ones. Most of the UEFI firmwares have support for accessing FAT12 (floppy disks), FAT16 and FAT32 filesystems in HDD and ISO9660 (and UDF) in CD/DVDs. EFI in Apple-Intel Macs are known to support Apple Partition Map also apart from MBR and GPT. The commonly used UEFI firmwares support both MBR and GPT partition table. UEFI has support for reading both the partition table as well as understanding filesystems. UEFI firmware does not support booting through the above mentioned method which is the only way supported by BIOS.