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

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Hide “disk password” login option at EFI (Filevault) login screen

I encrypted my volume before installation and have added my user as FileVault user afterwards. Now I can login with either the disk password or my user login password at the EFI (Filevault) login ...
2
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2answers
470 views

How can I repair EFI?

The computer is a MacBook Air. I have OSX Yosemite and Linux Ubuntu 14.04 dual boot. I messed up and damaged my Mac EFI and hence OSX ceased to work. Recovery disk was destoyed too. FileVault is on ...
3
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1answer
309 views

FreeBSD Install DVD corrupted my Mac OS X harddisk

Recently, I have tried a FreeBSD 7.4 i386 Install DVD, just to see some screens of FreeBSD on my Mac mini Intel 2006. I was going to see (to remember) just several dialog screen of and perhaps I would ...
2
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1answer
2k 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 ...
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1answer
563 views

Efibootmgr command for OS X

I have successfully been able to install Linux Mint on my Mac. The only issue is I cannot select the boot partition holding option. To fix it I booted into linux and ran sudo efibootmgr -o 1,80. This ...
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1answer
416 views

Boot menu not working

So basically I can't boot from my ssd anymore. It just shows a grey screen with an error symbol. I can't get into target disk mode and none of the other boot shortcuts seem to be working either. When ...
0
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1answer
36 views

Grub on Mac via EFI (Linux: /dev/sda1 Darwin: /dev/disk0s1) (MacBook Pro Early 2011 if it matters)

I installed Debian Jessie 8.5 on my MacBook Pro over my old Bootcamp partition (Windows 8.1). I deleted the bootcamp partition with the partition manager in the Debian Installer and created two new ...
0
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1answer
129 views

Installing El Capitan from a bootable DVD

I have El Capitan on a bootable DVD. I restart my Mac and hold the option key until the disks come up and I choose EFI Boot (name of the disk is different than what it shows at the time of booting). ...
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1answer
27 views

File types in EFI partition

In El Capitan, I mounted the EFI partition using sudo diskutil mount /dev/disk0s1 and instead of finding apps that I can run, I found .scap, .smc, .epm, and .efi files. What are these? The reason I ...
0
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1answer
99 views

EFI automounts on startup

After upgrading to the newest El Capitan from 10.10. to 10.11.1 - I guess - the normally invisible EFI partition appears on the desktop as a regular volume on different machines, if I choose to show ...
0
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1answer
515 views

GRUB 2 - “fb: swiutching to radeondrmfb from EFI VGA”

Whenever I try to boot Arch, Mint or Debian from a USB stick using GRUB 2 on my mac with compatibility mode, it freezes on this error (given in the question title). I've tried every available, up to ...
0
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1answer
138 views

Boot from external USB3

I've recently bought an usb3 flash drive where I've put a live kali linux distribution. When I try to boot my early 2015 mac book pro (with Yosemite) from this usb3 drive I have two options: windows ...
0
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1answer
107 views

Resizing system partition

When I installed OSX Mavericks, I left free space after my system partition in case I wanted to install a second OS there. This has proved unnecessary — I've never modified the partition table — and ...
0
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1answer
491 views

MacBook Pro Mid 2012 Windows 8 install on SSD

I am trying to install Windows 8, efi, on my SSD. I am getting the error code: 0xC0000005 "Windows installation encountered an unexpected error. Verify that the installation sources are accesible, ...
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0answers
11 views

Macbook Pro EFI Edit

I have Linux installed on a Macbook Pro 5.1 (2009). The Linux kernel starts up with the Performance CPU Governor, which causes the CPU to get hot. Linux will drive the CPU at 3.06 GHz, but Apple ...
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0answers
63 views

Boot Windows from USB with EFI password

I've created an USB with Windows 10 from where I can boot: Restart pressing option. Select USB EFI partition. Windows starts. When EFI password is active it will be asked when booting pressing the ...
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0answers
287 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 ...
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0answers
553 views

What is /Volumes/firmwaresyncd?

I keep seeing this in my logs: > 10/5/15 3:45:16.532 AM deleted[366]: normalizeUserMountpoint:738 > volRoot failed for /Volumes/firmwaresyncd.G3PNKw What is it? Is it related to the firmware ...
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0answers
419 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 ...
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0answers
5k 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/...
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0answers
679 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 ...
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0answers
55 views

How do I get my dual boot to behave correctly?

Once upon a time my Mac had only OS X on it, but at various points in history it contained different versions of OS X and several different Linux distributions and their boot menus. I also had rEFIt ...
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0answers
522 views

Corrupted hybrid GPT disk and possible fixes

I have a 17" Mac Book Pro (Late 2011) which have dual boot Windows 8.1 installation via Bootcamp along MacOSX. Prior to Mavericks upgrade I had this disk layout EFI Machintosh (~115 GB) Bootcamp (~...
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0answers
299 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 ...
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0answers
2k views

How to create linux USB discs that do work on Apple Macs?

It seems that there are several problems releated to incompatibilities between Apple-EFI and UEFI that do prevent Apple users from easily using USB drives to install or even run other operating ...
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0answers
621 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 ...
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0answers
440 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 ...
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0answers
24 views

Can't access External Drive (time machine), no EFI partition system. How to manually rewrite it?

tried to back up my Mac to time machine yesterday but I couldn't mount the drive. I have a Lacie 3TD hdd that is partition into msdos(for transfer between pc and mac) and hfs(time machine). I am able ...
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0answers
25 views

Mac OSX EFI problems, urgent help needed!

So, I recently did an update on OSX, booted my computer up and I discovered that I the update replaced my EFI boot rom and the SMC with the incorrect SMC, so now I can't use my battery and the ...
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0answers
47 views

Why do we need /usr/standalone/i386/Firmware.scap file?

I am sorry for bad english - this is computer translation. Continuing the theme begun in the here and the here There Giuseppe9000 wrote: The file is needed in the boot process I renamed the ...
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0answers
40 views

firmwaresyncd - ESP Firmware.scap - /usr/standalone/i386/Firmware.scap

Please explain why /Volumes/EFI/EFI/APPLE/EXTENSIONS/Firmware.scap is overwritten every time you boot (as indicated below) though the file is not used while booting? host:~ user$ man 8 firmwaresyncd ....
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38 views

Does my stuck shift key affect the proper boot of my installation mediums?

I have a late-2009 unibody Macbook Pro. My left shift is stuck for ages and I have been avoiding this problem by pressing some other keys during boot to avoid safe mode and by using Karabiner to remap ...
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0answers
43 views

Create EFI partition on external HDD for rEFInd

How can I install Ubuntu and Windows onto my external HDD which already has OS X installed on it? I want to install it using rEFInd boot manager. If I can create an EFI partition for my drive then I ...
0
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0answers
57 views

Issue with OS X Startup Disk in System Preferences when using EFI dual boot

I have Windows booting EFI on my Mac mini (Late 2012). It has two physical drives with one EFI partition (on the OS X disk). If I option boot I see OS X and EFI (Windows) choices and everything works ...
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0answers
488 views

How to use Testdisk under OS X recovery mode?

I accidentally broke the GUID, I suppose, when I was trying to solve the incorrect EFI partition problem. What I have now is: Disk1 is a 4 GB thumb drive with a recovery partition (disk1s2) I ...
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0answers
249 views

HFS+ external drive missing EFI, will not mount on Mac

First off: Fear not, I have everything from this drive backed up. I'm just trying to reformat it, but I had someone else attempt it on Windows which doesn't look like it helped. I'm a novice but ...
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159 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 ...
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0answers
61 views

Reset MacBook Pro Boot Location

I logged into my friend's MacBook Pro 13 as Guest User to install OS X Yosemite on a USB flashdrive. I downloaded the Installer from the Mac App Store and stored it somewhere within the Guest User's ...
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0answers
1k views

How to recover fully formatted EFI partition?

I have macbook 4,1. I tried to install on it ubuntu and fully formatted hard drive. So, there are any way to restore efi partition? (now all apple bootable cd display stop sign and do not work) I ...
0
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0answers
617 views

Efi Boot appears on BootCamp page

I'm new in this forum and I hope someone has an answer for my issue. Since yesterday my mac-book pro won't boot in Os X I have boot-camp on it If I turn on normally the apple logo, loading circle ...
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0answers
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Repeated Kernel Panics & Freezing on Late 2012 Mac Mini 6,1. Help please with the Log

I've had massive problems with my Mac Mini recently. It has been freezing and rebooting after around 10 to 50 minutes use. It's a Late 2012 Mac Mini 6,1 with 8gb of memory. The problems got worse ...