Questions tagged [uefi]
Unified Extensible Firmware Interface (UEFI) is a specification that defines a software interface between an operating system and platform firmware (BIOS)
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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 ...
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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 ...
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What do I need to send an Extended DHCPOFFER with multiple boot options?
According to Wikipedia and a bazillion other pages, you can have:
Proxy DHCP
If a PXE redirection service (Proxy DHCP) receives an extended DHCPDISCOVER, it replies with an extended DHCPOFFER ...
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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 ...
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Debian - software RAID 1 in UEFI mode
I am a beginner in UEFI, so excuse me if this question is vey simple. I have two 3 TB disks and want to install Debian 9.4 with RAID1 in UEFI mode.After reading all the information I am thinking about ...
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Copy EFI partition and BCD store to a second drive
I'm attempting to set up dynamic boot partition mirroring on GUID partition table (GPT) disks as part of making a bootable mirror of a Windows system drive.
I am following Microsoft's KB951985 but I ...
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Windows software RAID 1 with EFI bootloader on both disks
I have a Windows Server 2008r2 with two HDDs installed. The main partition, which has Windows installation on it, is mirrored between the two disks.
The problem is, this is a UEFI machine, and EFI ...
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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 ...
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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 ...
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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 ...
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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, ...
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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-...
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1
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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 ...
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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 ...
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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. ...
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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 ...
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Chainloading syslinux using grub2
I created a syslinux/isolinux hybrid CD iso to boot either legacy bios or eufi depending on what is needed. The legacy bios part works well and has worked for many years. I am using the newest (6.0.3) ...
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BHyVe: Is there any way to boot to UEFI shell?
I'm starting BHyVe virtual machine with UEFI firmware from ports using chyves and I have a problem with a boot loader misconfiguration on this particular VM.
I don't want to boot to OS in order to ...
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Install oVirt Node 4.1.6 on IBM x3650 M3
I have here a IBM x3650 M3 Server, with ServerRaid m5015 controller and two disk as raid1 configured. Bios firmware is the newest Version, settings a default except VT-D is enabled and I add legacy ...
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Fedora 26 UEFI/EFI Rescue Boot
I need to rescue an unbootable UEFI Fedora 26 system.
I have booted from the DVD, and used the rescue choot environment. I have a GPT disk with a small FAT32 ESP partition of type EF00.
I've run:
...
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WDS + GRUB2 UEFI: most menu items not working
We are using WDS to deploy operating systems to several types of machines.
As per this small guide, I got the UEFI clients to boot grub, but most of the menu items aren't working.
When highlighting a ...
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create bootable ISO from USB flash drive recovery media with imgburn or other tool
I need clean my HDD and partitions but first did a recovery usb drive with the recovery tool, the recovery is one of Thinkpad E431 and was done right.
I cant rely only on a fragile usb drive to keep ...
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EFI Error after Windows Server Volume Restore
We had an epic failure of our Windows Server 2012 R2 Essentials Server. We are running a Western Digital Sentinel 5100, and the RAID controller somehow wiped every disk (yay!). We are trying to ...
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Remotely troubleshoot why EFi failed to boot a Linux kernel
I have recently inherited a Linux (Gentoo, 3.14 kernel) server. The server is physically located in another country, 3 hours of flight away.
The server is set up to use EFI to boot. Its hard drive ...
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CentOS 6 installation crashes when trying to boot media from BIOS set to UEFI mode
I'm trying to install CentOS 6 on Dell R410 server. As I need a GPT large disk support, I set the BIOS to UEFI configuration. The problem is that I'm getting crashes once the server tries to boot from ...
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What are the implications of GPT when attempting image-based deployment for workstations?
I've got 13 machines with identical hardware that I need to deploy. The machines all have the new UEFI standard, which apparently forces GPT regardless of disk size. I've thus far been unsuccessful in ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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1
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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 ...
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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 ...
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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 ...
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IP helper addresses for regular DHCP plus PXE booting
We use WDS to install new workstations, and the newest batch we've gotten are set to use UEFI, so I'm trying to adjust my setup accordingly.
Previously, we had the 66 and 67 options set on our DHCP ...
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Troubleshoot libvirt-managed qemu x86-64 UEFI guest
I have a libvirt/qemu/x64 UEFI guest running Windows 10. The problem is that it starts successfully every other time.
When I issue a guest start commmand (any libvirt method) 1st time, the guest ...
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Prepare Dell PowerEdge R430 for Software Raid Linux
I am wondering which settings are recommended for a R430 to run in Software Raid mode. The server is equipped with 4 disks which should run in Raid 1 for the boot/system and Raid 10 for data. However ...
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Forcing legacy boot
I have a new PC with a reference Intel motherboard and AMI BIOS (5.010 on a LynxPoint-LP chipset motherboard). There is no OEM support, so I'm on my own with this.
I have a PXE network and WDS ...
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How to find wwn through EFI Shell?
I have not installed any OS in the server. HBA card is attached to the server and after power ON it enters into EFI shell. I entered below command and it show FC driver
drivers
Output like
17F ...