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Re: [Qemu-devel] OVMF, SeaBIOS & non-CSM based legacy boot

From: Jordan Justen
Subject: Re: [Qemu-devel] OVMF, SeaBIOS & non-CSM based legacy boot
Date: Mon, 21 Mar 2011 14:31:24 -0700

On Mon, Mar 21, 2011 at 14:17, Michael Brown <address@hidden> wrote:
> On Monday 21 Mar 2011 21:06:24 Stefan Hajnoczi wrote:
>> On Mon, Mar 21, 2011 at 6:27 PM, Anthony Liguori <address@hidden>
>> > Is there gPXE for UEFI yet?
>> I have never tried it myself, but I think it should work.  CCed
>> Michael Brown to check.
> Yes, iPXE for UEFI exists and works.  Last tested by me about a week ago, on
> various IBM UEFI systems.
> Compared to a "legacy" BIOS network boot, you can't do anything very
> interesting with UEFI.  Features such as iSCSI, FCoE, AoE, HTTP all work with
> a "legacy" BIOS but not with UEFI.  A "legacy" BIOS network boot allows you to
> boot an operating system; a UEFI network boot only allows you to boot an EFI
> executable (which could be a second-stage OS loader).

Your input on network boot is much more valuable than mine.  (I'm
certainly no expert here...)

But, for a UEFI system, loading a UEFI executable is equivalent to
starting the OS.  Whether that executable is a second stage loader, or
contains the OS kernel, it up to the OS implementation.


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