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On Sunday 29 Jan 2017 14:44:45 Tom H wrote: |
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> On Sat, Jan 28, 2017 at 2:31 PM, Mick <michaelkintzios@×××××.com> wrote: |
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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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> |
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> For example, on my MacBook, the ESP only has what looks like hardware |
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> updaters. |
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|
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Yes, this is where firmware updates install images for the hardware and these |
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are flashed/loaded when the MacOS boots. |
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|
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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 |
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> IDENTIFIER 0: GUID_partition_scheme 500.3 GB |
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> disk0 1: EFI EFI 314.6 MB |
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> disk0s1 2: Apple_CoreStorage Macintosh HD 499.3 GB |
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> disk0s2 3: Apple_Boot Recovery HD 650.0 MB |
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> 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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> |
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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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|
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Yes, Apple's firmare reads the blessed hfs+ partition and fishes out its |
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bootx64.efi file kernel image, but I thought this was from the second partition |
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where the OS is installed. I'll have a look tomorrow when I boot it up. |
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-- |
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Regards, |
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Mick |
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