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How to convert a Mac BIOS boot to EFI boot?

rated 0 times [ 1] [ 0] / answers: 1 / hits: 3631 / 2 Years ago, fri, september 9, 2022, 5:54:35

I am running Kubuntu 13.04 on my MacBook Pro (8,2) and I have it set up to boot through Apple's BIOS emulation. I would like to use the Intel instead of the ATI graphics card. This means that I will need to get the system to boot via EFI. I don't want to do a clean install. The furtherest I can get is into grub-efi, but I cannot actually boot the kernel from there.

My partition scheme:

/dev/sda1 = EFI

/dev/sda2 = Mac OS

/dev/sda3 = root

/dev/sda4 = boot

/dev/sda5 = home

/dev/sda6 = swap

How can I achieve EFI booting on a BIOS booting install without loosing my existing OS installations?

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termetalli

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answered 2 Years ago alliulet · Accepted Answer

Try this:

Instal rEFInd in OS X. You can use the install.sh script to do this.

Type sudo mkdir /EFI/refind/drivers_x64 in an OS X Terminal window. (If you use the --esp option to install.sh, you'll need to adjust the path to create this directory on the ESP.)

Install the rEFInd EFI driver for whatever filesystem you're using to store your Linux kernels (usually ext4fs, but sometimes not). To install the driver, you need to copy it to the drivers or drivers_x64 subdirectory of the rEFInd installation directory (/EFI/refind by default in OS X).

In Linux (even from a BIOS-mode boot), run the mkrlconf.sh script that comes with rEFInd. This will generate a /boot/refind_linux.conf file, which holds kernel options that rEFInd passes to your kernel.

Ideally, this will enable you to boot directly to Linux in EFI mode, bypassing GRUB, which can be tricky to configure if the automated scripts don't get it right. rEFInd should detect your kernels each time you boot, so you won't need to update anything when you upgrade your kernels.

If this works, and if you're not triple-booting with Windows, you may want to:

Edit /EFI/refind/refind.conf, uncomment the scanfor line, and ensure that hdbios is not present. This will keep the old BIOS-mode GRUB from showing up as a rEFInd boot options.

Remove the hybrid MBR from your hard disk. You can do this by editing the partition table with parted or GParted (just make any trivial change) or by installing the gdisk package, launching gdisk on your disk, typing x to get to the experts' menu, typing n to generate a new protective MBR, and typing w to save your changes. Removing the hybrid MBR will reduce the odds that it will cause problems in the future.