Download Oracle VM VirtualBox User Manual

3 Configuring virtual machines
To switch back to using the BIOS, use:
VBoxManage modifyvm "VM name" --firmware bios
One notable user of EFI is Apple’s Mac OS X, but recent Linuxes (such as Fedora 11)
and Windows (starting with Vista) can be booted using EFI as well.
Another possible use of EFI in VirtualBox is development and testing of EFI applications, without booting any OS.
Note that the VirtualBox EFI support is experimental and will be enhanced as EFI
matures and becomes more widespread. While Mac OS X and Linux guests are known
to work fine, Windows guests are currently unable to boot using EFI.
3.12.1 Video modes in EFI
EFI provides two distinct video interfaces: GOP (Graphics Output Protocol) and UGA
(Universal Graphics Adapter). Mac OS X uses GOP, while Linux tends to use UGA.
VirtualBox provides a configuration option to control the framebuffer size for both
interfaces.
To control GOP, use the following VBoxManage command:
VBoxManage setextradata vmname VBoxInternal2/EfiGopMode N
Where N can be one of 0,1,2,3,4 referring to the 640x480, 800x600, 1024x768,
1280x1024, 1440x900 screen resolution respectively.
To change the UGA resolution:
VBoxManage setextradata vmname VBoxInternal2/UgaHorizontalResolution 1440
VBoxManage setextradata vmname VBoxInternal2/UgaVerticalResolution
900
The video mode for both GOP and UGA can only be changed when the VM is powered off and remains persistent until changed.
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