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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 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 models no longer contain a BIOS but rather come with…
Gringo Suave
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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 have this output 3 x server with 128GiB RAM show…
fraleone
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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 local system from a network resource in the EFI…
Locane
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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, UEFI doesn't support booting from BTRFS. Most of…
phbi
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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, changing bios/uefi settings in um... Bios will…
termil0r
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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 bcdedit: bcdedit /set {fwbootmgr} DEFAULT
Collin Reynolds
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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 now with the advent of UEFI I‘m not sure how to…
Fango
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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 as notes about how the error has been resolved…
DigiMij
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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 to the client's port 68/UDP (DHCP client port). An…
MikeyB
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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 (usable) System RAM: 511MB (523844kB) "xm info"…
lmz
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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 my system, despite all the requirements being…
Matthias Berndt
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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 external USB ports, so please don't suggest this.) I…
mr.zog
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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 shim.efi file should be fine. Unable to fetch TFTP…
qwertbert23
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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 Virtual Machines, one being a DHCP and TFTP server, and…
kRYOoX
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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 to convert from EFI firmware to Legacy without…
Justin Jahn
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