Hot answers tagged uefi
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First of all, the simple answer to your question:
If you have an ARM tablet running Windows RT (like the Surface RT or the Asus Vivo RT), then you will not be able to disable Secure Boot or install other OSes. Like many other ARM tablets, these devices will only run the OS they come with.
If you have a non-ARM computer running Windows 8 (like the Surface ...
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I've spent a lot of time trying to get my Windows 8 PC to boot again after cloning to a new SSD and try to summarise how I finally got it all working -
Firstly, boot from a UEFI Windows 8 recovery disk (CD/DVD/USB) - I found that the automated recovery process didn't find the correct Windows partition, nor when I managed to add it to BCD settings would it ...
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OK, it was a very involving process, but I solved my problem and everything works together just as it should.
I'm documenting the solution for everyone:
One must begin with GParted Live and create a fresh GPT partition table. This will wipe everything on the HDD resp. SSD. Then one must create a small 8 MB 'unpartitioned' partition and flag it with ...
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Boot your computer with a live-usb/CD in UEFI mode. I had two boot options <flash_drive> and UEFI: <flash_drive>, the second is needed to expose the efi variables in /sys/firmware/efi/ so that efibootmgr don't fail later on. Booting with the first option gives me the following error:
Fatal: Couldn't open either sysfs or procfs directories for ...
9
Yes. Windows 8 will support BIOS without UEFI.
We will continue to support the legacy BIOS interface, but machines using the UEFI interface will have significantly richer capabilities.
The quote is from Microsoft's Building Windows 8 Developers Blog title: Reengineering the Windows boot experience. It was just posted yesterday.
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Do you suggest to enable UEFI boot?
Yes, for one very simple reason: It will make you used to the way that things are more than likely going to be done as standard on your next personal computer, and are already done as standard on other lines of personal computers such as Intel Macintoshes.
The advantages and disadvantages of firmwares are not ...
7
Now, I'll cut to the chase and show you how to find this log file.
I have done this with a retail Windows Vista DVD disc, just for the purpose of demonstrating this. But this should be the same even if you boot from a USB flash drive, or if you use Windows 7.
When you boot from a Windows DVD or USB you will first see a dialog where you choose language and ...
6
There will be an extra UEFI partition on the hard drive, It may be hidden, if you can get a look at the files in the partition there will be some with an .efi file extension.
Different manufactures label the partitions differently, mine is labeled "HP_TOOLS"
I agree with William, all the new laptops I have seen in the last 2 years have UEFI
EDIT:
Another ...
6
I have asked this question so that people can have fun with the discussion that follows.
As I post this text as an answer, here are three possible ways to achieve this:
Having UEFI Secure Boot deleting the Microsoft key and adding keys used by GNU/Linux bootloaders (As of Frank Thomas' comment)
Using another processor architecture than x86 or windows 8 ...
5
Your computer has UEFI firmware, a replacement for the old BIOS (although it still has support for BIOS-only operating systems).
In BIOS systems, the bootloader (or the "stage1" of a large bootloader) is stored inside the MBR, in the zeroth sector of the disk. (The 512-byte MBR reserves 446 bytes for bootstrap code, the rest is used for partition ...
5
I am having problems confirming this information, but, I have personally not seen a laptop released within the last few years (non atom and latest technology) that was not EFI.
The best bit of advice I can give is to write down the BIOS version/serial/manufacturer and try to Google it and see what you can find out.
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DDR3 is a memory standard that is twice as fast as DDR2.
Dual and triple channel memory is not a feature of memory per se, but it is a feature that requires a compatible motherboard and processor.
Dual/Triple channel in its simplest form is breaking up the data the memory needs to use in to two or three chunks instead of one so that each part can be done ...
5
It will make it possible for Microsoft, in cooperation with specific motherboard vendors, to lock specific motherboard models to only boot to operating systems signed with a Microsoft-supplied key. You will still be able to run any application you want once the operating system is installed. The only thing that is locked is the boot loader.
At present, no ...
5
Anti- Virus
Windows 8 already has anti-malware built in by default, just open Windows Defender and voila! It is there for a reason. UEFI does indeed secure system files by checking them on boot but in no way interferes with software security or the files you run on your PC. Malicious software can still be installed and run without a problem.
Malware will ...
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@Ramhound: Mac OS X only requires a GPT partitioning scheme to INSTALL, it will boot from MBR if your copy the OS to such a disk.
@John: The simple answer is no, you can't. Here's why.
You should not convert a Windows installation in place, you should instead install from scratch. This is one of those problems where you would spend more time making copies ...
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I had exactly the same problem and figured out it is was the cable not the motherboard! The spec for Displayport cables directs that pin 20 (power) should not be connected. However, many (cheaper) cables don't adhere to this. Some devices (esp Dell monitors and Gigabyte motherboards) fail completely in this situation - I assume other devices are somehow ...
4
No, a partition is not one and the same as a file; and Wikipedia is misleading you.
That second paragraph is wrong on pretty much all points. EFI does not require any such things, and never relies upon a boot sector. If you want the gen on this, I suggest reading the actual EFI specification. It's fairly clear on what the \EFI\BOOT\BOOTxxx.EFI files are ...
4
You cannot do that.
It should be glaringly obvious that any pre-boot application, such as the boot loader program for an operating system, is tightly coupled to the machine firmware; just as an ordinary applications program is tied to the operating system whose services it employs. An EFI boot loader program cannot be run on a machine unless that machine ...
4
I'm going to say the battery is most likely the culprit with BIOS settings not being remembered.
You'll need to push the metal panels sideways and then the battery should just pop out (seen at 12 and 6'0 Clock position in the circle below.). Take necessary measures to protect against electrostatic discharge and avoid killing the motherboard.
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Firstly: note that while UEFI can provide faster boot times, it doesn't automatically do so; it depends on the firmware in question.
Secondly: yes, you need to reinstall Windows if you want to switch to UEFI. Windows is installed in UEFI mode only if you boot the install DVD in UEFI mode. You may also need to reformat the disk, because in UEFI mode ...
4
It's tricky to switch between BIOS-mode and EFI-mode OSes on a single computer; for best results, you should keep both OSes in one boot mode. Your best bet is to install an EFI-mode boot loader for Mint. Several are available, but installation can be tricky. Specific options you might want to try include the following:
Use Ubuntu's "Boot Repair" tool (I ...
4
Whatever you do, proceed with caution. You could make matters worse if you apply the wrong fix. Ideally, you should do a full low-level backup of the disk to a spare disk; but I realize this may not be practical with such a big source disk.
My first suggestion is to study my GPT fdisk documentation, and particularly the page on repairing GPT disks. The ...
4
(U)EFI-based systems, by specification, can only boot from GPT-style disks. The traditional BIOS can boot from MBR-style disks, and in some cases (depends on the manufacturer), they can also boot from GPT. However, as per the UEFI specification, the disk should have a GPT partition table.
This MSDN article describes it well:
Systems that support UEFI ...
4
AFAIK RHEL 6 has basic support for UEFI (grub-efi, efibootmgr) with no support for Secure Boot. This means you have to turn off Secure Boot on Windows 8 logo machines if you want to install CentOS 6. I'm not aware of multiboot support for RHEL UEFI installation.
Disclaimer: I did UEFI QA at Red Hat. This does not represent the official stance of Red Hat.
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To get the DVD drive to show up in the boot menu, you might need to go into the BIOS (actually (U)EFI Settings) and enable Legacy (BIOS) Mode or the UEFI Compatibility Support Module (CSM) or similarly worded option:
(Screenshot of Asus Zenbook Prime UX31A-DH51 BIOS with CSM disabled.)
(Screenshot of Asus K55A BIOS with CSM enabled.)
Note: You might ...
3
Well Norton Ghost in rather old and doesn't clone successfully all the data from newer operating systems such as Vista, 7, and 8.
I use Acronis True Image Home 2010 instead and does a far better job. Most likely the Windows clone will load successfully, or in worst case I can fix startup issues using the installation DVD once and that's it! So download ...
3
To elaborate on option #1 by FSMaxB, I've written a page with (mostly) step-by-step instructions for replacing your Secure Boot keys here. Note, however, that some of the details of what to select in the firmware's own user interface will be system-specific. There are also other ways to accomplish this goal. Adding new keys (as described shortly) will ...
3
It might be worth doing a cold shutdown (hit the power button) in Windows to see if you can boot afterwards, just as a test. Obviously you wouldn't want to do this on a regular basis, but it might be helpful to confirm that Windows is overwriting your revised ESP data. If it's actually damaging the filesystem on Windows shutdown, then this sounds like a ...
3
The issue you are having is due to the low system power (current draw) of the Llano CPU and chipset. ATX PSU's check the current draw on startup and if there is not sufficient current draw by the system from the PSU it will not start. You can check this for yourself, if you place a PCI express graphics card in the PC your issues will magically disappear. The ...
3
I would up-vote this, but apparently I don't have enough rep on SuperUser. I'm glad I finally found an answer to this after days of fighting clones that worked but wouldn't boot. I think it all relates to UEFI and some kind of "secure booting" mechanism or something.
I'm working off-line, so apt-get wasn't an option. What I did was put Ubuntu Desktop on a ...
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