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Questions tagged [efi]

Extensible Firmware Interface is a specification that defines a software interface between an operating system and platform firmware

4
votes
1answer
3k views

Understanding firmware.scap

So, I recently acquired an old MacbookPro (v.5,4 mid 2009). I decided to create an Arch linux partition, and thus began my adventure... While installing rEFInd (the maintained fork of rEFIt), I ended ...
4
votes
0answers
45 views

Old Mac Pro: Windows? GPUs?

I recently got an old Mac Pro 1,1 for free, and was wondering what's necessary to get it running Windows. I know that you needed Boot Camp before Windows 7, because it didn't support the EFI, but ...
3
votes
0answers
110 views

Firmware Password isn't the one I entered

So the firmware password isn't the one I entered. To avoid the usual onslaught of insinuations that it 'might not be my computer' that usually accompany questions of this nature, I want to state ...
2
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0answers
43 views

Multi-boot boot loaders missing after MacOS update

My MacBook Air (2017) currently has 3 OSes: MacOS, Windows, and Ubuntu (making it work was a nightmare). Yesterday when I opened up rEFInd, only MacOS and the Ubuntu stub loader (which, fortunately, ...
2
votes
0answers
325 views

What happens if you delete the contents of the EFI partition?

So, I was playing around with the diskutil command. Then I thought of mounting the EFI partition. It mounted successfully and I viewed its contents. When I right-clicked on a file I saw an option to ...
2
votes
0answers
79 views

What process powers the progress bar during initial boot?

I recently learned that launchd was written and used starting with Mac OS X Tiger. Before it's inception the progress bar would actually give useful information about what process was currently being ...
2
votes
0answers
901 views

Mac Pro, Boot into OSX without EFI after Bootcamp

I have a Mac Pro, early 2008. I installed Windows 10 using bootcamp. The mac came with an 8800gt, but I had a GTX680 from my other PC which I put in the mac, it is not the mac version so I don't get ...
1
vote
0answers
19 views

Bootable USB stick trying to install on USB instead of hard drive

So I‘m trying to install Ubuntu for Dual Boot on my MacBook Pro. I‘m running macOS 10.14 with APFS, created a new partition formatted as FAT32. Created bootable USB stick with Etcher and so forth. So ...
1
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0answers
44 views

Adding functionality to macOS pre-boot process

Is anyone familiar with adding functionality to the macOS pre-boot process? I'm trying to supplement FileVault's functionality so that it can integrate with a user directory service, which isn't ...
1
vote
0answers
70 views

Windows Bootcamp will not boot with rEFInd disc inserted

I'm new here and I couldn't find anything related to my problem, so if this question is already answered, then I apologize. I have two partitions running on my late-2011 17-inch MacBook Pro. One ...
1
vote
0answers
777 views

Linux on Mac, dual-boot without rEFind EFI issues

So I followed the instructions here This actually worked great. I was able to install ubuntu and the dual boot is working, however, in my startup window I have a dummy Windows option that boots to ...
1
vote
0answers
289 views

Ubuntu: Can't boot Mac, only shows a Folder with a Question Mark?

Bodhi Linux and Ubuntu 18.04 install fine -- but whenever I try to install Ubuntu Server onto this older Macbook it doesn't boot. Instead I get a question mark: Wouldn't even know where to begin to ...
1
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0answers
98 views

Mystery: Filevault not prompting for password after hard drive removed and reinserted

I hooked up my 8,1 Macbook Pro's (A) fully Filevault 2-encrypted internal disk (El Capitan) to another Mac B (also El Capitan) externally to back it up. I had to input my Filevault password (every ...
1
vote
0answers
551 views

Does Apple's EFI patch Thunderbolt devices to Windows 10?

So, I've been rattling with myself about this for a bit. I've followed 5SH-2a's guide of EFI Bootcamp to no avail. I decided to try it on my own, by mapping an NTFS Partition on my hard drive to a ...
1
vote
0answers
6k views

rEFIt boot changed after update to Yosemite

I was using rEFIt to work with Ubuntu with my Mac. After the upgrade to Yosemite I had a problem with rEFIt. I found the following solution on ubuntuforums.org but rEFIt still didn't work: cd /efi/...
1
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0answers
1k views

Accidentally Removed EFI Partition

I removed the EFI partition accidentally but I have it on a Time machine backup. Is there a way to simply move it from my external drive to my boot drive. I've tried restoring the format of the boot ...
1
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0answers
376 views

Impossible install Mac OSX, probably firmware damaged

Yesterday evening I install update on my MacBook Unibody (Version 6,1; Late 2009). The update run on Mac OS X 10.8.5 consist in security update and new version of Safari and iTunes. The update is run ...
1
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0answers
475 views

Replacing OS X with Linux or Unix, and making the switch to Tiling Window Managers

I have a Macbook Pro 8,2 and really want to make the switch to something a little less stubborn and a little more flexible than the proprietary Mac OS X. I am a bit frustrated with MacPorts lately and ...
0
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0answers
11 views

MacBookPro12,1 BootCamp Windows 7 repair “GUID CODE: FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF (Unknown)”

I am trying to fix my windows 7 MSR partition. Everything was working since I decided to install ubuntu. I was able to fix the boot partitions before but now I'm stuck. The image shows GUID of MSR is ...
0
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0answers
12 views

what are the EFI vars that need to be set for the screen to boot up to black instead of gray?

you know how some macs boot gray with grayer apple logo and newer ones boot up black with apple logo? that's what I'm talking about I don't have access to a macOS partition and I don't even remember ...
0
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0answers
19 views

rEFInd text tool tips for boot menu

How can I customize the rEFInd boot menu so that there's text next to the various penguin icons? This is done through the label option? (I'm not at the MacBook presently, but planning ahead.)
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0answers
167 views

rEFInd menu not showing

How do I bring up the rEFInd GUI? It was showing before, but now just directly boots into Mac OS. I've not installed Linux yet, but am preparing to do so. After using disk-utility now rEFInd seems ...
0
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0answers
288 views

partition failed with the error: couldn't unmount disk

After having resized the Mac partition through the CLI from: /dev/disk0 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme ...
0
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0answers
32 views

Simplest possible partition scheme for dual boot Linux?

I want to dual or triple boot an older MacBook. To partition, I can do that from the Mac OS itself? What partition scheme would I want, generally speaking. There are two GB of RAM. I want at least ...
0
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0answers
234 views

How to install Linux on a 64bit-processor iMac (2006) with 32bit-EFI?

I have an iMac from 2006 with an Intel Core2Duo, which is 64-bit. I have also found I am using a 32 bit EFI: $ ioreg -l -p IODeviceTree | grep firmware-abi | | "firmware-abi" = <"EFI32"> I ...
0
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0answers
314 views

Corrupt EFI Partition or Error b/c of Encryption? & Ghost Partition

I have a 2012 Mac Mini Server with two internal SSDs. Until recently, I had Mt. Lion installed on one of the SSDs, as my only boot drive, and used the other, rarely, for file storage. I created a ...
0
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0answers
1k views

How do I install Linux on a late 2012 mac mini?

I installed a 2nd hard drive in my late 2012 mac mini. This hard disk had Mint Linux - 12 on it (Installed when it was in a different computer). Pressing the Option showed me two additional hard disks ...