Questions tagged [uefi]

Unified Extensible Firmware Interface (UEFI) is a specification that defines a software interface between an operating system and platform firmware (BIOS)

Filter by
Sorted by
Tagged with
0 votes
0 answers
162 views

Can MAAS be used to deploy Ubuntu in UEFI boot mode?

Supermicro is telling me that with the latest BIOS update on my blade server, that I can only boot from NVMe drives if I set the BIOS to “UEFI” boot mode and then install Ubuntu in EFI in boot mode. I ...
Curtis's user avatar
  • 503
0 votes
0 answers
423 views

How to get Debian RAID 1 preseed to populate EFI partitions on both disks?

Most similar question I found: Ubuntu software raid on efi, how to boot off second drive? My situation is, I have a working preseed file for Debian installation that will configure my NVMe drives to ...
Wildcard's user avatar
  • 172
0 votes
0 answers
61 views

Secure Boot driver signature fails after disk conversion to UEFI - Windows Server 2019

I have a number of servers I need to get converted to UEFI from MBR disk. I have the process for this working well in a lab environment but when I try to do it on production servers after the ...
yesitsmedoug's user avatar
0 votes
0 answers
355 views

How does Windows 11 bootrec /scanos find Windows installations?

How does Windows 11, "bootrec /scanos" identify the Windows 11 OS? and How can the: "Total Identified Windows installations: 0" be fixed? Problem: When running bootrec /scanos from ...
Steve's user avatar
  • 101
0 votes
0 answers
66 views

Generate uefi signature keys for xcp-ng

I am trying to install xcp-ng on a new server, with uefi mode enabled (I am upgrading from a previous install, so uefi is mandatory) unfortunately, my new server does not recognize xcp-ng 8.x ...
cerien's user avatar
  • 21
-1 votes
1 answer
111 views

"Factory Reset"-Strategy with an UEFI-x86-GPIO-Board

What would be the "right" strategy for this use-case? x86_64-platform with UEFI 40-Pin GPIO available Ubuntu/Debian and Yocto-Custom-Build available (by manufacturer) for that platform/...
Maas's user avatar
  • 99
0 votes
2 answers
290 views

A Dell R710 server in UEFI boot mode is not displaying the grub menu

I have a Dell R170 server with Ubuntu installed on it. It is in UEFI boot mode. The system boots properly. I have configured /etc/default/grub with options that should make it display the grub menu ...
elyograg's user avatar
  • 249
0 votes
0 answers
237 views

What is the best practice for servers - EFI or legacy mode?

I'm currently installing a new Linux server and am trying to decide whether to use legacy mode (BIOS) or EFI. So far, I'm leaning towards legacy because it's less complex (less partitions) and has ...
Ondra Simek's user avatar
0 votes
1 answer
339 views

freeze on "Loading initial ramdisk" debian 9

I have a functional debian 9 (kernel 4.9.0-19-amd64) on an old pc, I made an image of this debian with clonezilla and I put it on a newer pc... I know it's bad ^^ My concern is that when I boot ...
ArnOCP's user avatar
  • 11
1 vote
0 answers
186 views

NVMe drive disappears after kernel panic

I'm working on imaging a Dell OptiPlex Micro 3000 device with Linux (custom Yocto-based OS). Grub version 2.04. I'm using an A/B partitioning scheme and trying to get the fallback to function properly ...
mitchellJ's user avatar
  • 143
1 vote
1 answer
576 views

netbooting CentOS via PXE and UEFI : unable to mount root over nfs -- failed to switch root path /sysroot

Last weekend, I went down the rabbit hole of trying to netboot rockylinux on raspberry pi 4. I was able make it work as far as being able to boot the kernel. But I fail to properly nfs mount root. I ...
Kabira  K's user avatar
  • 133
1 vote
0 answers
295 views

How tofind the kernel driver name for the pcie controller in a running linux system booted from uefi/acpi?

I have an Ampere ARMv8 server running Ubuntu 20.04. I want to find out the kernel driver used for the PCIe controllers. How should I do? My purpose is to prove a hypothesis that for a server (which ...
bruin's user avatar
  • 111
1 vote
0 answers
132 views

Can grub2 chainloader a efi application on a filesystem other than FAT32?

I have a efi application in XFS partition. (hd0,gpt2)/test/EFI/BOOT/BOOTX64.EFI I try to chainloader it by: set root="(hd0,gpt2)/test" chainloader /EFI/BOOT/BOOTX64.EFI But chainloader ...
Wang's user avatar
  • 322
0 votes
1 answer
304 views

32-bit Linux UEFI network booting

I am trying to boot temporary Linux via UEFI network boot, and I need it 32-bit x86. Only 32-bit live distribution I know is RescueCD which seem to have no EFI stub in kernel to boot. I was trying to ...
kab00m's user avatar
  • 508
2 votes
0 answers
162 views

Does UEFI info on the hard drive's boot partition gets written to the system's BIOS?

I was transferring a set of existing raid drives into a second-hand server, an HP Gen9 server. I observed 2 interesting details: When I was configuring UEFI boot Order shown in the picture below, I ...
eliu's user avatar
  • 121
0 votes
1 answer
49 views

Do nvidia drivers need reinstalling after changing memory slots on Linux (UEFI)?

I've changed the memory slots (took out a set of 3x32Gb and put a fresh set of 3x32Gb of ECC type) on a Linux computer with Ubuntu 22.04 and upon reboot, the nvidia-smi command complained that the ...
719016's user avatar
  • 103
0 votes
1 answer
1k views

PXE boot failing on RHEL install; PXE-E79

i'm trying to install RHEL 9.0 on a gigabyte motherboard, Product Name: H170M-D3H-CF. My dhcp setup has worked in the past, so I don't think the dhcp is the issue. I know that something is going ...
user3303210's user avatar
5 votes
3 answers
2k views

How should the EFI System partition be made redundant without using hardware RAID?

What is BCP for making the EFI System partition redundant without using hardware RAID? If I create 3x EFI System partitions on different devices and then backup any changes made to the primary (...
Neil Stockbridge's user avatar
0 votes
1 answer
226 views

OpenSUSE transactional server boot partition and efi

I have following problem with OpenSUSE transactional server. By mistake it was configured with /boot being ext4 partition on a dedicated drive, which also contains /boot/efi. I have noticed that /boot ...
mip's user avatar
  • 101
0 votes
1 answer
2k views

How to make grub for fully portable linux on usb thumbdrive without writing entry to systems EFI?

I've installed Debian Bullseye on a usb thumbdrive. When I plug the thumbdrive notebook bootet from it, because there was an entry in UEFI "debian". After removing it with sudo efibootmgr -b ...
Hannes's user avatar
  • 327
0 votes
1 answer
1k views

How to partition disks in Debian 10 installer for RAID5 on UEFI machine?

Installing Debian 10. I have 3 disks I want to use as RAID5 on a UEFI machine. I have tried several configurations that either led to failure to install grub or failure to boot (stuck in grub-rescue ...
Laurent CAPRANI's user avatar
1 vote
0 answers
216 views

How to use EFI Shell to recover from SELinux Lockout?

I enabled SELinux on my Centos 8 box and now I can't get back into the server. It's hosted with a company, so I don't have physical access to it. But I do have access to advanced boot options, ...
rockstardev's user avatar
2 votes
2 answers
2k views

After installing any OS (bios is set to UEFI), the boot order constantly changes (windows and linux installs). How can I disable this "feature"

Have numerous different servers (primarily Dell) that we are installing through pxeboot. After the OS is installed the first time, the UEFI boot sequence is automatically changed to allow the OS to ...
IT_User's user avatar
  • 210
0 votes
1 answer
349 views

Why does this EFI-based Linux host keep booting to the second drive?

I have several servers with the same basic setup: primary drive with VFAT /boot/efi, XFS /boot, and XFS / on LVM; and secondary drive with exactly the same thing, each partition rsynced nightly. I ...
rlpowell's user avatar
  • 203
0 votes
0 answers
237 views

How to run xen hypervisor on a computer that only supports UEFI?

I have tried updating the bios, disabling hyperthreading, adding xen.efi to its proper location within Ubuntu, building xen from source, etc. Yet I cannot get past the following error a Xen panic ...
sololuvr's user avatar
0 votes
0 answers
473 views

Why does grub's os-prober add entries with `linux` instead of `linuxefi`

On my system, I have two copies of CentOS 7 installed, and one copy of Windows 10 Pro. Every system is bootable and works correctly, and is fully up to date (kernels, packages, the works). When I run ...
Grismar's user avatar
  • 127
0 votes
1 answer
2k views

Issues with Ubuntu not booting on HPE Proliant ML30 Gen9

One of the server machines we use for database backup procedures is having issues and I ran out of ideas. At some point, it froze completely, and so it was forcefully rebooted. After that, the machine ...
Maximiliano Segovia's user avatar
0 votes
2 answers
2k views

Ubuntu install with pxe boot (UEFI)

Do I need to create a special configuration to install an ubuntu server with uefi over network pxe boot? I have on my boot server the default pxelinux.0 file. After installation of a new hardware i ...
live2's user avatar
  • 113
1 vote
1 answer
4k views

how to load grub with menu in ipxe setup

I am trying to setup an ipxe environment on a vmware. I would like to configure the setup with UEFI. I have setup a ubuntu-server and configured it as pxe-server. via downloading ipxe, isc-dhcpd, tftp-...
Ruchir Bharadwaj's user avatar
0 votes
1 answer
3k views

HPE Proliant Gen10 Stack Fault Exception during PXE boot with UEFI

I am trying to pxe boot a HPE Proliant Gen10 using UEFI BIOS with RHEL (have tried both 7 and 8) and am getting a stack fault exception after the server receives the first boot file (shimx64.efi): HPE ...
Mike's user avatar
  • 1
0 votes
1 answer
3k views

My physical server boot freezes at UEFI: MEM INIT after installing OS

Model: LENOVO ThinkSystem SR250 Was able to boot into Provisioning Manager, set up RAID. After installing Windows Server 2019, it reboots, then stuck at Power On Self Test - UEFI: MEM INIT\ Planned to ...
Kantstandyourbitz's user avatar
1 vote
1 answer
5k views

Is it possible to update AMI bios from Linux?

I have a motherboard on Supermicro server (model X9SCM(+)/X9SCM). And it is not possible to update it via Supermicro Update Manager - looks like bmc just cannot communicate with bios at all on this ...
Ashark's user avatar
  • 346
0 votes
1 answer
2k views

How to use HTTP Boot for VMWare VM UEFI client

I have a VMWare VM (ESXi 6.5, VM version 13) that I want to image over the network. For the past several years we have been using (with much success) a TFTP server containing a PXE image. Now I want ...
user35042's user avatar
  • 2,711
0 votes
1 answer
3k views

Alpine setup on virtual machine UEFI does not boot

I am trying to setup Alpine linux on a VM (Proxmox) to replicate the layout of physical hardware (raspberry pi). The real layout is a raspberry pi 3, installed as "data" mode (based on wiki) ...
Dede's user avatar
  • 101
0 votes
0 answers
742 views

Booting from CD-ROM image with HP server in UEFI mode

I have a ProLiant BL460c Gen9 server, on which I want to install my OS with UEFI mode. After I changed the boot mode to UEFI and disabled secure-boot and tried to boot my Centos7 Image from CD-ROM ...
Dvir Saidof's user avatar
5 votes
1 answer
588 views

How much physical RAM is "lost" to BIOS/UEFI?

Browsing the linux kernel output dmesg on 6 different systems (4 server, and for the sake of comparison also 2 laptops) I am shocked by the large amount of BIOS/UEFI reserved RAM Three servers systems ...
fraleone's user avatar
  • 171
1 vote
1 answer
5k views

PCIe - Training error on device - Link degraded, macLinkWidth = x16, negotiatedLinkWidth = x8

i've placed a pcie raid adapter card with onboard ssd's (AORUS RAID ADAPTOR built in with 4 x PCIe 3.0 512GB NVMe SSD) in a new (2020) Dell (Optiplex 7080). the system boots fine most times, but it ...
vulgarbulgar's user avatar
0 votes
1 answer
253 views

Access POS UEFI (Aptio) from linux

I have a POS machine that uses the Aptio BIOS/UEFI. In there, there is an option called OS SELECTION which is set to linux/win7 as I use linux for that machine. Is there a way to check this remotely ...
Panagiotis's user avatar
4 votes
1 answer
1k views

systemd-gpt-auto-generator doesn't mount EFI system partition

according to the documentation, the systemd-gpt-auto-generator should automatically find the EFI system partition and generate a mount unit to mount it on /efi. However this does not appear to work on ...
Matthias Berndt's user avatar
1 vote
0 answers
8k views

INACCESSIBLE BOOT DEVICE on Windows Server 2019 after Windows update installation

Was doing routine updates and one of our Windows Server 2019 hypervisors didn't come back up afterwards. Instead it gives the error "INACCESSIBLE BOOT DEVICE". I've followed various guides ...
ryansin's user avatar
  • 193
1 vote
0 answers
285 views

Chain loading grub2 via PXELINUX for UEFI CentOS 8 installation

We support multiple linux distributions and we install them via the UEFI version of pxelinux. Before CentOS 8 you could just directly load the kernel and the initrd via the UEFI version of PXElinux. ...
ZCT's user avatar
  • 13
1 vote
0 answers
469 views

Ubuntu 18.04 "Advanced Installation" official guide for RAID 1 installation appears broken for UEFI installation

I had no issues earlier with RAID 1 setup on Ubuntu 16.04. However, on 18.04 it has been a struggle. I finally located this guide. I followed the guideline to the dot. However, I am unable to set the ...
Sunny's user avatar
  • 381
3 votes
2 answers
2k views

UEFI boot sequence initially set to PXE first but always reset to local disk first after ESXi installation

I have some Dell PowerEdge R720 servers for testing. To make life easier, the UEFI boot is set to PXE first and in the PXE boot menu it'll default to boot from local disk if there's no input from the ...
SF.express's user avatar
2 votes
2 answers
4k views

How to modify a VM instance setting to boot from BIOS to UEFI?

I shrank my boot hard disk size on my Google Cloud Compute VM. Something which switched the boot method of the OS installed on it from legacy to UEFI along with the disk boot settings (which triggers ...
user2284570's user avatar
1 vote
1 answer
2k views

Convert MBR linux disk to GPT to run Windows 10

I'm in a situation where I want to reformat my main SSD hard drive (500GB) to run Windows 10. Currently it is running linux (ubuntu). I have a bootable Windows 10 install USB, however when I try to ...
AndyPerlitch's user avatar
0 votes
1 answer
866 views

How to add a certificate in UEFI SHIM for signing a kernel module on GCP?

I followed this tutorial in order to add my own signed kernel module in my Ubuntu VM (18.04 LTS). It is hosted on Google Cloud Platform. I would like to add a certificate in the UEFI shim/Mokmanager, ...
Antonin M.'s user avatar
0 votes
0 answers
517 views

Fedora Boot UEFI SLOW

After a fresh install of Fedora 31, the boot time is incredibily slow. I suspect something went wrong with the boot partitions. Here is the layout [root@linux Scaricati]# efibootmgr EFI variables ...
gdm's user avatar
  • 459
0 votes
2 answers
16k views

(WDS) UEFI PXE Boot Fails While Downloading NBP File

Hello guys i'm currently running into an issue where the laptop that i'm trying to network boot with would go download the NBP file over the network but then it would go back to the BIOS menu. I was ...
Hexalogy's user avatar
0 votes
0 answers
428 views

No boot in Devuan after installation - EFI Shell

I installed Devuan ASCII on a virtual machine on VirtualBox. Installation went smooth, but after installation I get the following EFI shell See the image But any attempt to enter a BLK* device ended ...
JaKaiser's user avatar
0 votes
1 answer
198 views

Can a UEFI driver/service reserve a PCI device, preventing the OS from knowing about it and then use it after the OS boots [closed]

Theoretically, if i was to have a extra network card in my computer would it be possible to create a UEFI driver/service which would prevent the about-to-boot operating system from knowing about the ...
user555237's user avatar