vbox 4.3.20 - UEFI guest OS

[krchat]

Hello everyone, try to set EFI boot, but I get error message:

the exception Breakpoint. A breakpoint has been reached.
0x80000003 occured in the application at location 0xe1c3eb10


Host - Win 7x64; Guest Win 8.1 Prox32

[loukingjr]

As far as I know VirtualBox does not support UEFI, it supports EFI. You install Windows guests with EFI disabled.

[krchat]

Are they difficult, I thought that UEFI is only Unified EFI But If I make guest Win 8x64 - I don't get any error, I get input to EFI setup and can't run install OS next.

[socratis]

I thought that UEFI is only Unified EFI

Not really, EFI has been deprecated in favor of UEFI (treat it like UEFI is EFI v.2.0). From the Wikipedia article on EFI: "Extensible Firmware Interface, a firmware interface specification, predecessor of UEFI", which points you to the UEFI article.

Now, VirtualBox offers only experimental support for UEFI, but it's improving over time. See:

• Chapter 3.12: Alternative firmware (EFI) in the User Manual.
• Ticket # 12022: Windows 8.1 installer hangs at "fish" logo with UEFI boot.
• Ticket #7702: UEFI support for Windows guests