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On Sat, Jan 28, 2017 at 2:31 PM, Mick <michaelkintzios@×××××.com> wrote: |
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> |
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> rEFInd is definitely a slick and useful boot manager for multibooting. |
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> On this occasion I did not install it, but decided to remain |
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> minimalist, because I do not want to interfere much with the AppleMac |
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> installation. |
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> |
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> So, I created /boot/EFI/LINUX/ on /dev/sda1, leaving the original |
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> /boot/EFI/APPLE as was and copied in the LINUX/ directory just the |
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> gentoo kernel image, .config and System files. I named the kernel |
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> image 'bootx64-4.4.39-gentoo.efi' to differentiate from other images I |
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> will install over time. |
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> |
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> Then using the efibootmgr I set up bootx64-4.4.39-gentoo.efi as the |
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> default boot kernel and when the MackBook is started it boots straight |
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> into Gentoo, in what it feels like milliseconds. :-) |
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> |
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> When I need to boot into MacOS I have to press the alt key (aka Option |
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> ⌥ key) as I power it on and the Apple firmware boot loader takes over. |
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> What I don't know yet is if a MacOS upgrade will wipe the |
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> /boot/EFI/LINUX/ in /dev/sda1 as it upgrades the APPLE files, but it |
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> is easy to boot with a LiveUSB and copy over the Linux kernel once |
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> more. |
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|
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Apple doesn't boot from the ESP [1] so it most likely won't touch |
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"/boot/EFI/LINUX/". |
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For example, on my MacBook, the ESP only has what looks like hardware updaters. |
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|
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# diskutil list disk0 |
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/dev/disk0 (internal): |
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#: TYPE NAME SIZE IDENTIFIER |
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0: GUID_partition_scheme 500.3 GB disk0 |
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1: EFI EFI 314.6 MB disk0s1 |
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2: Apple_CoreStorage Macintosh HD 499.3 GB disk0s2 |
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3: Apple_Boot Recovery HD 650.0 MB disk0s3 |
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|
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|
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# diskutil mount readOnly -mountpoint ESP disk0s1 |
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Volume EFI on disk0s1 mounted |
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|
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|
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# ls -R ESP/EFI |
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APPLE |
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|
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ESP/EFI/APPLE: |
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EXTENSIONS FIRMWARE UPDATERS |
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|
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ESP/EFI/APPLE/EXTENSIONS: |
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Firmware.scap |
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|
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ESP/EFI/APPLE/FIRMWARE: |
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MB91_0154_B09_LOCKED.fd |
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|
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ESP/EFI/APPLE/UPDATERS: |
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MULTIUPDATER USBCH USBCVA |
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|
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ESP/EFI/APPLE/UPDATERS/MULTIUPDATER: |
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HPMUtil.efi Mac-9AE82516C7C6B903.epm MultiUpdater.efi flasher_base.smc |
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Mac-9AE82516C7C6B903-B0_3.72.bin Mac-9AE82516C7C6B903.smc |
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SmcFlasher.efi flasher_update.smc |
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|
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ESP/EFI/APPLE/UPDATERS/USBCH: |
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HPMUtil_v39.efi J93-USBC-NVM-2.72.0-P_B0-S.bin |
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|
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ESP/EFI/APPLE/UPDATERS/USBCVA: |
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HPMUtil.efi fw-p1-USBCVideoAdapter-S.bin |
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# |
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[1] Apple's EFI firmware can read hfsplus and it boots (IIRC since OS |
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X 10.10) from a kernel on the Apple_Boot partition (disk0s3). |
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