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Questions tagged [uefi]

The Unified Extensible Firmware Interface (UEFI) is a specification that defines a software interface between an operating system and platform firmware. UEFI is meant to replace the Basic Input/Output System (BIOS) firmware interface.

The Unified Extensible Firmware Interface (UEFI) is a specification that defines a software interface between an operating system and platform firmware. UEFI is meant to replace the Basic Input/Output System (BIOS) firmware interface.

For more information see:

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Building EFI applications with UDK14/15 targeted to AARCH64 using Visual Studio 2012/2015//WinDDK 8.1 ARM Compiler

Is it possible to build EFI applications with UDK14/UDK15 targeted to AARCH64 using Visual 2012/2015/WinDDK8.1 ARM Compiler in windows platform? I have tried building the UDK 14/15 code using VS2012 ARM Compiler and I am receiving…
ravikanth
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After boot does Linux reclaims Tianocore boot loader memory

I am using Tianocore for booting Linux, I understand that Linux can avail Tianocore Runtime services (reboot, update_capsule etc.), it means that some part of Tianocore code remains untouched by linux. Linux will never touch that memory. My…
user28264
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Convert string to unsigned short int C++ in uEFI

I want to convert a string to unsigned short int. Below is the code: unsigned short int file2[3072]={0}; string file1; file1="hello"; Not sure how to proceed further.Please help. Thanks.
user3815585
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uefi cannot create file on my machine's volume

I'm writing an application that works from efi environment (f.e. can be run from EFI shell). My problem is that I cannot create any file on my machine's volume. I tested it on WMVare and on real machines with ntfs and even on mac with hfs+ (got…
LeTigre
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Why a UEFI protocol header file defines both a macro and an external global variable for a single protocol GUID?

I am new to UEFI (Unified Extensible Firmware Interface) development. And I am using the EDK (EFI Development Kit). To create a new protocol, we need to give the protocol a GUID. For example, in the header file for BlockIO protocol, we can see…
smwikipedia
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Black Console after automated Debian UEFI install

I try to build a reproducible automated build environment based on Debian 8.1 Jessie. I created a boot iso image based on a netinstall image and put a preseed.cfg file in int for automatic installation. I managed to get it bootable with BIOS and…
H. Villinger
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how to use block i/o protocol in my uefi bootloader

I am reading FreeBSD uefi bootloader. But there is a part I can't understand about Block I/O Protocol.I quote source code. status = systab->BootServices->LocateHandle(ByProtocol, &BlockIoProtocolGUID, NULL, &nparts, handles); nparts /=…
The coffee 17th cup
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UDK/EDK2 Built UEFI Applications hang real system

I have setup the UDK2014 and EDK2 source and am successfully building an EFI application that runs fine in the SecMain emulator. However when I transfer the application to a real UEFI system and run it the system hangs. I've tried just a simple…
Without Me It Just Aweso
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UEFI LoadImage hangs

I am looking at using Bootservices function LoadImage to load a UEFI application image from memory. Function parameters are: typedef EFI_STATUS LoadImage ( IN BOOLEAN BootPolicy, IN EFI_HANDLE ParentImageHandle, IN EFI_DEVICE_PATH_PROTOCOL…
Without Me It Just Aweso
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How to remove Ubuntu entries from UEFI

I 've got an issue with my UEFI boot values. In the past I installed Ubuntu 14.10 LTS as a dual-boot system. It was working ok, until I decited to remove it. I deleted the Ubuntu partitions and merged them with my Windows partition. Everything is…
geortzan1
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How to static link EDK II library into application in Visual Studio 2008 tool chain

I have EDK II application and library in package and it works fine when I compile it with library source codes. Now I want to remove the library source codes and link that library with application through .lib file. I remove library source codes…
Dilshan Jayakody
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Beagleboard Qemu baremetal with UEFI

I am trying to boot a freertos app from UEFI on Qemu When i run the app from uboot, using the below commands it runs without any errors fatload mmc 0 80300000 rtosdemo.bin go 0x80300000 An uefi application loads the elf file at 0x80300000 and…
Lonewolf
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qemu beagle sd card error

I am trying to run uefi code in qemu for beagle board using the following command qemu-system-arm -M beagle -sd beagle_sd.img -serial stdio -clock unix The sdcard holds uefi, which starts the shell, when this runs I am getting sd card error saying…
Lonewolf
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Is there any way of emulating an I/O device in UEFI?

Is there any way of emulating an I/O device (eg. super IO controller) in an UEFI runtime driver running behind the OS?
mateass
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scrolling in a command line interface

If you have a large amount of output to a command line interface, how do you navigate upward to see the information that has already scrolled off the screen? Is there common commands for this across various command line interfaces?
sammond
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