Questions tagged [uefi]
Unified Extensible Firmware Interface (UEFI) is a specification that defines a software interface between an operating system and platform firmware (BIOS)
150
questions
37
votes
5
answers
6k
views
Could `rm -rf / --no-preserve-root` mess up the bios?
In order to see approximate speeds for tarballing an entire system, and then restoring that system when if it was foobar'd, I partially cloned one of our primary systems onto a workstation that, while ...
- 469
30
votes
3
answers
95k
views
How do I convert my linux disk from MBR to GPT with UEFI?
I have a linux box (Ubuntu 16.04) whose boot disk is partitioned using MBR. How can I convert it to GPT+UEFI?
- 1,338
17
votes
3
answers
169k
views
USB drive not detected in Intel EFI shell
I must update an Intel S3420GPLC board. BIOS, BMC, FRU / SDR, the whole thing.
Everything is pretty much automated in the Intel download. You're supposed to boot to the integrated EFI shell, mount ...
- 513
13
votes
3
answers
30k
views
Force Windows Server 2008 to use legacy BIOS bootloader instead of EFI
We have UEFI servers and have come across a situation where we need to force Windows Server 2008 to boot via the legacy BIOS method instead of through UEFI.
Is there a way to tell Windows Server 2008 ...
- 39.5k
11
votes
2
answers
58k
views
IBM Server takes a long time to boot past UEFI to OS
I have a pair of IBM System x3620 servers. These servers do fine once they finally reach the point where the operating system takes over, but it takes them forever to get past the new-fangled UEFI ...
- 13k
11
votes
2
answers
7k
views
What is the PXE Client System Architecture Type "BC EFI (7)" from RFC 4578?
RFC 4578 defines various machine architectures for PXE as follows:
Type Architecture Name
---- -----------------
0 Intel x86PC
1 NEC/PC98
2 EFI Itanium
3 DEC Alpha
4 Arc ...
- 39.5k
11
votes
5
answers
4k
views
UEFI netboot menu
I have an existing PXE syslinux environment and I'd like to set up a similar EFI-based netboot environment.
I'm a big fan of the various menus as seen in the screenshot below and I'd like to find ...
- 39.5k
8
votes
3
answers
23k
views
CentOS 7 and Hyper-V
I'm trying to install CentOS 7 using Hyper-V and it's failing with the following error message:
tsc: Fast TSC calibration failed
PCI: Fatal: No config space access function found
i8042: No controller ...
- 5,766
8
votes
4
answers
23k
views
How to perform a P2V conversion of a Windows Server 2008 R2 EFI system?
As discussed elsewhere, Windows Server 2008/R2 will automatically use the EFI boot loader when installed on EFI systems, and will also automatically use the GPT partitioning scheme on such systems. ...
- 70.7k
7
votes
2
answers
6k
views
How to install Ubuntu Server 12.04 in a Virtualbox VM with UEFI boot enabled [closed]
I have a server which I'd like to install Ubuntu 12.04 on, but I've had some problems and thought it would be nice to get things working in a Virtualbox VM with the same features as the server.
I ...
- 1,832
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 (...
- 163
5
votes
1
answer
12k
views
Syslinux: How to correctly configure for UEFI PXE boot?
A variety of machines will happily boot a custom bzImage via PXE in legacy mode using syslinux.
In UEFI mode, one of these machines and a newer UEFI only board get assigned an IP address, TFTP ...
- 185
5
votes
3
answers
3k
views
How to retrieve Serial Number from Windows on new U/EFI box?
I need to retrieve the hardware serial numbers from a set of new HP mini desktops that need provisioning.
This worked in the past using a WSH script to query it via WMI. Unfortunately, the newer ...
- 503
5
votes
2
answers
6k
views
Reimage a Hyper V Gen 2 / UEFI VM
So we finally bit the bullet and started using UEFI for our desktops. It works perfectly for our Hyper V images - we can create gen 2 VMs all day long. This is true until we need to reimage. How do I ...
- 15.6k
5
votes
1
answer
17k
views
Building uEFI bootable ISO and USB for Windows 7 deployment
I have been trying to build up a window's 7 and 2k8 EFI deployment ISO or USB.
But struggling to to even get an ISO to boot from even VMware Workstation EFI implementation. The problem is there is no ...
- 384
5
votes
1
answer
4k
views
HyperV Linux EFI VHDX migration is missing EFI in the boot options
I have a HyperV 2016 cluster of n machine running on W2k16.
I've duplicated the VHDX of a RHEL 7.5 (Gen2) VM that runs with this boot order (and secure boot disabled):
After creating a new VM with ...
5
votes
1
answer
4k
views
GCP: Invalid resource usage: 'UEFI feature is not available for this project.'
I created an image using the --guest-os-features="UEFI_COMPATIBLE" option as described in the documentation but when trying to instantiate an VM Instance (using the Console and gcloud) I get the ...
google-cloud-platform
5
votes
1
answer
539
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 ...
- 171
4
votes
1
answer
25k
views
Server 2012 R2 FSRM Event ID 8197 Error: GetVolumeNameForVolumeMountPoint, 0x800700001, incorrect function
I found next to no information about this error with respect to Server 2012. There is a good deal of information out about this error with Server 2003 with a update package fix from Microsoft as well ...
- 151
4
votes
5
answers
3k
views
Xen only sees 512MB of System RAM. Should be 8GB. (UEFI boot)
I am booting Xen 4.0 from Debian Squeeze, kernel 2.6.32-5-xen-amd64. "xm dmesg" on dom0 shows:
Xen-e801 RAM map:
0000000000000000 - 0000000000091400 (usable)
0000000000100000 - 0000000020000000 (...
- 379
4
votes
2
answers
10k
views
Is it possible to access network resources through an EFI shell?
I keep seeing allusions to the idea that EFI / UEFI shells support network resources with an extension, but I don't seem to be able to find anything concrete.
I'm trying to get sas3flash.efi on to a ...
- 429
4
votes
5
answers
15k
views
Changing UEFI boot order from Windows
I can't get Windows to change the UEFI boot order to PXE boot first from within Windows. I'm trying to automate the system so that it PXE boots every time, so I can control the boot option. I've tried ...
4
votes
1
answer
8k
views
Esxi hypervisor install: uefi or bios?
I recently bought Dell PowerEdge T430 server and I want to install on it ESXi 6.0. Since VMware now supports UEFI (from version 5.0) I want to ask how to install hypervisor?
BIOS
UEFI
After install, ...
- 133
4
votes
1
answer
3k
views
BTRFS-RAID and booting from EFI system partition
UEFI requires booting from a ESP which is most of the time formatted as vFAT. If I recall correctly BTRFS could have sub-volumes formatted as ext3/ext4 like the Logical Volume Manager (LVM). However, ...
- 41
4
votes
1
answer
3k
views
Images (e.g. with Clonezilla) of Windows and Linux on a UEFI computer
I use Clonezilla with success for many years to make images from partitions that host Windows 7 or smaller and Ubuntu and other operating systems. Making images and restore them was easy for me.
But ...
- 149
4
votes
1
answer
874
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 ...
- 141
4
votes
4
answers
2k
views
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 ...
- 39.5k
3
votes
2
answers
6k
views
Convert From UEFI to Legacy BIOS in Windows Server 2012
We are looking into Azure Site Recovery as a possible BCDR solution, and have encountered a bit of an issue in that Azure doesn't support UEFI firmware when synchronizing VMWare VMs.
Is there any way ...
- 193
3
votes
2
answers
2k
views
How do UEFI and virtual machines relate to each other?
I am trying to get my head around UEFI (Unified Extensible Firmware Interface) and it's not entirely clear to me how this affects virtual machines.
Thus, there are three parts to this question:
Is ...
- 135
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 ...
- 378
3
votes
1
answer
6k
views
How do I mount the OS (system) disk from the UEFI shell?
I have to run a firmware update script that lives on the first hard drive of an Intel server board. I must use the UEFI shell to run this script, according to the Intel docs.
(Our servers have no ...
- 931
3
votes
1
answer
3k
views
dnsmasq proxyDHCP PXE and EFI "start_image() returned Invalid Parameter"
I'm tying to install a PXE install server with dnsmasq in proyxDHCP mode.
So far legacy BIOS install is working.
When I try to use EFI it fails.
With dhcpd the EFI boot is working. Therefore the ...
- 41
3
votes
1
answer
4k
views
Ubuntu software raid on efi, how to boot off second drive?
I'm up and running on Ubuntu server with software raid 1 with 2 500GB drives and I'm just trying to test things out.
If I unplug the second drive I'm able to boot in degraded mode but if I unplug the ...
- 165
3
votes
1
answer
3k
views
UEFI iPXE boot into debian results in grub shell
For a bit of context, I'm a sysadmin student, trying to expand my network knowledge since it's not my strongest point.
Currently, I'm experimenting with PXE. A few days ago, I set up a few ESXi ...
- 133
2
votes
1
answer
14k
views
Preseeding debian install - EFI
The EFI partition is formatted in ext4 during the setup of debian.
I am trying to preseed the install of debian jessie and I can't get it working since the UEFI partition is formatted in ext4 (got ...
- 21
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 ...
2
votes
2
answers
1k
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 ...
- 210
2
votes
3
answers
4k
views
Create iPXE UEFI bootable image for QEMU/Libvirt with custom next-server and filename
I can create a VM with libvirt/qemu to boot in UEFI mode. I know that it does iPXE by default, but I want to create/modify a iPXE image in order to override filename and next-server properties.
How ...
- 131
2
votes
1
answer
1k
views
How can I generate/or edit a grub.cfg on each EFI partition that refers to the ubuntu installation on the same physical disk?
I have an install of Ubuntu 16.04 server set up on two disks with software raid across two large partitions. The start of each disk contains an EFI partition. I would like to be able to boot from ...
- 265
2
votes
1
answer
14k
views
Trouble with DnsMasq, DHCP proxy, PXE for UEFI clients
I'm trying to setup a PXE server with dnsmasq as a dhcp-proxy.
It works well with client-arch=0 (x86 legacy clients) but UEFI client doesn't even terminate the DHCP packets exchange with the PXE ...
2
votes
3
answers
3k
views
linux - how to list partitions of specific type?
I am looking for a way to list all partitions of a specific type on linux. (Specifically: all EFI system partitions).
I know blkid can filter on filesystem type: the command blkid -t TYPE=vfat ...
- 1,774
2
votes
2
answers
2k
views
SuperMicro X9SRE only boots UEFI Debian 8.1 when "forced"
I have the following configuration:
SuperMicro X9SRE (Intel C602 chipset) updated to latest firmware v3.2 (01/2015)
LSI Spitfire 9211-4i HBA with 1 GiB NAND cache
3 x 2 TiB SATA 6Gbps HDDs in ...
- 487
2
votes
1
answer
2k
views
uEFI Remote Mangement
Is there a sane method to set uEFI settings (for machines with no OS) from a remote machine? I've just spent hours for changing the boot order of a handful of machines. The extended boot up times for ...
- 5,708
2
votes
1
answer
980
views
GPT, grub and mdadm. sda drive replaced, raid rebuilt in recovery mode, but now server won't boot
This is how partition table loooks like:
(parted) print
Model: ATA TOSHIBA DT01ACA2 (scsi)
Disk /dev/sda: 2000GB
Sector size (logical/...
- 599
2
votes
1
answer
1k
views
Installing Server 2012R2 on VM with GPT harddrive issues
So... long story short I'm working on automated installations of Windows Server 2012 R2 on systems with GPT drives both physical and virtual. I haven't brought the disk back down stairs to the ...
- 31
2
votes
4
answers
9k
views
Kickstarting Ubuntu 14.04: How do I create an "EFI boot partition" from my ks.cfg?
I am PXE booting a server that has two 4Gb drives configured in RAID-1 in order to kickstart an instance of Ubuntu Server 14.04. I am PXE booting in EFI mode, and the install runs fine until I get ...
- 145
2
votes
1
answer
4k
views
Upgrading Firmware on LSI 9211-4i to IT
I've been trying to get my LSI SAS 9211-4i moved over to IT mode. But I cannot for the life of me get it erased so I can flash the IT firmware to it.
I've tried using FreeDOS (from the website) and ...
- 51
2
votes
3
answers
9k
views
Does Windows Hyper-V Server 2012 support UEFI clients?
I've read in several places that Hyper-V 2012 supports booting clients in UEFI mode, but I can't seem to figure out how to make that work.
There are no options in the settings for UEFI boot mode. I'...
- 600
2
votes
0
answers
146
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 ...
- 121
2
votes
1
answer
258
views
Are my EFI partitions mutually bootable? How to interpret the output of efibootmgr -v
I have two GPT formatted disks both starting with EFI partitions and followed by a single physical raid partition. I installed ubuntu-server 16.04 with software raid over these two raid partitions and ...
- 265