Unix and Linux Stack Exchange
Unix and Linux Stack Exchange

Questions tagged [uefi]

Questions about the Unified Extensible Firmware Interface (UEFI), the software interface aiming to replace typical BIOSes. This tag may also be used for questions related to UEFI partitions and systems.

1048 questions
54
votes
8 answers

"EFI variables are not supported on this system"

I am attempting to install Arch linux to a new (and very crappy) HP Pavillion 15 Notebook. This is a UEFI-based machine. After several swings at it, I have managed to get pretty far. Legacy mode is disabled in the system setup, and I have…
John Dibling
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18
votes
3 answers

Is there a free (libre) open source alternative to memtest86+ that works with UEFI?

In light of memtest86+ not working with UEFI, is there an open source alternative or something I can use from grub to test memory?
Evan Carroll
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8
votes
2 answers

efi variable entries in /sys/firmware/efi/efivars/

What are entries in /sys/firmware/efi/efivars/? I see that they are small binary files. Are these addresses and the contents of the address? For example /sys/firmware/efi/efivars/BootFromUSB-ec87d643-eba4-4bb5-a1e5-3f3e36b20da9 in hexadecimal…
infoclogged
  • 979
6
votes
6 answers

Restore EFI boot partition

I am triple booting Ubuntu, Debian, and Fedora. When I installed Fedora from a liveCD I got excited and kept hitting next, not realizing I was not installing GPT, but rather LVM. After doing this I cannot boot from a hard disk. The EFI menu doesn't…
No Time
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4
votes
0 answers

uefi bootloaders for distributions

I have stared reading about uefi recently and got to know that SYSLINUX and GRUB2 have their own uefi bootloader. i have few confusions specially in terms of pxe boot. 1) Are distributions use their own uefi bootloader for n/w boot or is it like…
Rajnish Kumar Soni
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3
votes
2 answers

Copying a non-EFI/GPT installation to a EFI/GPT installation

I recently purchased 2 SSDs (my first), and will be moving my system there. I'm using MD RAID 1 + LVM. I haven't yet decided whether I will be setting up a new stretch installation, or copying my jessie installation to the new disks, if that is…
Faheem Mitha
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1
vote
1 answer

Is EFI partition different from UEFI firmware?

I wonder whether deleting EFI partition also erase the UEFI firmware that initialize hardware rendering boot mode impossible.
Irigasumi
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1
vote
0 answers

efibootmgr: what if I remove all the non-manual entries?

$ efibootmgr -v BootCurrent: 0001 Timeout: 0 seconds BootOrder: 0001,0002,2001,2002,2003 Boot0001* Arch Linux …
fedoraman
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1
vote
0 answers

how to make efi script that launches linux kernel?

I'm trying to set up a simple efistub on my fresh arch linux system with simple editing of kernel parameters. Current process: there is an EFI boot option created by efistub that launches /EFI/arch/script.nsh on EFI partition, which contains…
tsmx
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0
votes
1 answer

Can bootloaders be placed outside the EFI directory on an ESP partition?

Is the EFI directory a mandatory part of the EFI standard or can bootloaders be placed in other directories. I'm contemplating moving my whole /boot over to the ESP partition (ensuring I have a large enough ESP partition). Now Debian based…
Philip Couling
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0
votes
1 answer

When and why does UEFI need to access the partition table?

I have a workstation with an UEFI firmware and a disk with a GPT type partition table. According to EFI Boot Manager, the the system is instructed to boot from UUID 7e169454-1df0-40bf-9c63-0f6b094c1e15: # efibootmgr -v BootCurrent: 0000 Timeout: 1…
Martin
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0
votes
2 answers

swaping HDD with various os under uefi

This is a preemptive question to avoid problems. I currently use a desktop PC with one hard drive in a caddy and one internal HDD (they both are SATA drives); the internal 1 TB drive is just for data with no OS on it (formated as NTFS so that both…
chameau
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0
votes
0 answers

Trouble booting Linux USB

I bought a Lenovo Ideapad 320 a few months ago. I’ve tried installing Linux via USB flashdrive( no cd rom included with the machine). I’ve been successfully able to burn the ISo(Mint) to the flash drive but NO usb shows up in any boot option, wether…
Fiach Oneill
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0
votes
1 answer

Is grub.conf read by GRUBX64.EFI from SYSTEMD-BOOTX64.EFI?

Does the following mean that SYSTEMD-BOOTX64.EFI executes first, then GRUBX64.EFI, which then reads grub.conf? #> efibootmgr -v BootCurrent: 0001 Timeout: 1 seconds BootOrder: 0003,0001,000B,0005,000D,000C,0002 Boot0001* Linux Boot Manager …
dgo.a
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