26.12.2020

Mac Os Efi Boot

Mac Os Efi Boot Rating: 4,8/5 8718 votes

Clover EFI Bootloader In this tutorial we will be creating the bootloader that will allow you to run the macOS installer that will also be created in this guide onto your to-be Hackintosh. This will be created using a flash drive that needs to be 8GB or larger in size so that it has enough space ton hold the Sierra or El Capitan installer files.

  1. 1st SSD is OpenCore EFI partition and MacOS. 2nd SSD is Windows 10 EFI partition + Windows. I boot Windows by selecting then in OpenCore boot menu. Things seems to work for some time, and then usually Windows stop booting - they get stuck on a black screen after displaying and hiding a blue Windows logo. I investigated heavily, and it seems that.
  2. If your Mac is using a firmware password, you're prompted to enter the password. Option-Command-P-R: Reset NVRAM or PRAM. If your Mac is using a firmware password, it ignores this key combination or starts up from macOS Recovery. Shift (⇧): Start up in safe mode. Disabled when using a firmware password. D: Start up to the Apple Diagnostics.
  3. The result was a Mac Mini that would boot Ubuntu Trusty in pure EFI mode, with no rEFInd and no OS X, and with an Ubuntu entry in the Mac’s bootloader menu. They were excellent instructions.
  4. You can check what EFI version your system is running by clicking on the Apple menu and selecting About This Mac System Report Hardware. In the hardware overview section macOS displays the Model Identifier, the Boot ROM version and the SMC version number your Mac is running.
Please forgive my probable ignorance as I'm not a programmer, other than HTML and CSS. I hope someone can walk me through what I'm doing wrong. I've read through the manual, but it doesn't address the issue I'm experiencing. I've also read any number of threads in this forum, implementing several suggestions, but I still can't get the blasted thing to work.
SOFTWARE SPECS
VirtualBox 5.2.12r122591 (Qt5.6.3)
Host OS 10.11.6, 64-bit, preinstalled by macsales
Guest OS 10.5 Server, 32-bit (assumption), bought from eBay
10.6.3 Personal, 32- and 64-bit compatible, bought from Apple
HARDWARE SPECS
Mid-2011 iMac 12,1
2.5 GHz Intel Core i5
16 GB 1333 MHz DDR3
500 GB SATA hard drive
VM CREATION
I created an 80 GB partition and specified the VM was to be created on that partition, then created a fixed 50 GB VDI. The VM was created successfully, but I was unable to install either 10.5 Server or 10.6.3 Personal as a Guest. Regardless of settings, the VM consistently boots into the UEFI Shell. I noted that neither installation disk remained in the optical drive for more than a couple minutes, and it seems to me it generally takes much longer than that to install an OS.
SETTINGS
  • General > specified bidirectional shared clipboard and drag 'n' drop
  • System > specified 2048 MB base memory, chipset ICH9, PS/2 mouse, 1 CPU at 100%, boot order as optical then hard drive, and minimal paravirtualization, and disabled nested paging
  • Display > specified 128 MB video memory and 1 monitor at 100% scaling, enabled 3D acceleration, disabled 2D video acceleration and HiDIP output
  • Audio > enabled audio output only using CoreAudio driver and Soundblaster 16 controller
  • Network > set up all four adaptors: NAT, Bridged, Internal, Host-Only
  • Ports > enabled USB 2.0 controller (after installing the extension pack), entered every detail for my keyboard and mouse, including the serial numbers

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VBOXMANAGE
  • changed to a supported Mac, specifically iMac8,1
  • provided the serial number from the 10.5 Server installation disk
  • changed the screen resolution to 1280x1024

QUESTIONS
  • Will deleting or renaming 'AppleIntelCPUPowerManagement.kext' from the Host have any effect on its operation? Is this something that would help?
  • One forum thread suggested deleting the CpuIdTree code from the .vbox file. Would this help and, if so, how do I do it? The only option given in 'Open…' is vboxstarter.app.
  • What am I doing wrong? And how can I fix it? I'm close to tearing out my hair, and I'm pretty sure I taught my neighbors some new profanity. I'd eventually like to be able to virtualize 10.6.8 to use software that El Capitan will no longer run.

Here’s the answer to another reader request…

According to WIkipedia, “On Apple–Intel architecture Macintosh computers, the EFI partition is initially blank and not used for booting. However, the EFI partition is used as a staging area for firmware updates.” When people look to create non-standard boot environments or attempt to build a hackintosh, the first step is often mounting and modifying the EFI boot partition. Before you read any further, take note: altering your EFI boot partition is not supported by Apple and The Mac Admin takes no responsibility if you render your computer(s) unbootable by mounting and modifying this partition.

To mount an EFI boot partition, follow these steps:

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1. Discover the volume identifier for your EFI boot partition.

Run this command:

The output should look something like this:

In this case, the volume identifier of the EFI partition is disk0s1

2. Create a mount point.

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A mount point is a directory where a non-booted volume is mounted. On Mac OS X, mount points are typically created in /Volumes. We can create a directory called efi within /Volumes by running the following command:

Mac Os Efi Boot

3. Mount the EFI partition at the efi mount point.

Mac Os Catalina Efi Boot

Run the command:

Mac Os Efi Boot

That’s it. Your EFI volume will be mounted. Modify it at your own risk.