Re: [gentoo-amd64] Re: Emerging package as both 64 and 32 bit

[Mike Doty <kingtaco@gentoo.org>]

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Duncan wrote:
> Simon Stelling <blubb@gentoo.org> posted 45866BE0.20905@gentoo.org,
> excerpted below, on  Mon, 18 Dec 2006 12:22:24 +0200:
> 
>> Neil Bothwick wrote:
>>> What's wrong with the GRUB source package? I remember using grub-static
>>> when I first went 64 bit, but haven't used it for ages. The only 32 bit
>>> stuff I use here is firefox-bin and vmware.
>> No problem, but it's 32bit.
> 
> Indeed...  for backward compatibility, amd64/x86_64 boots in 32-bit mode. 
> Actually, I /believe/ it boots in 16-bit real mode, just like an x86, then
> switches to 32-bit or 64-bit when the appropriate command is given, but
> AFAIK the difference between compiling 16-bit and 32-bit code is simply a
> few compile-time switches, so it uses a standard 32-bit toolchain.
You're referring to real mode(16 bit).  the BIOS will load the
bootloader in real mode, the bootloader will switch to protected mode(32
bit) and if you have the right kernel, it will switch to extended
mode(64 bit)

- --
=======================================================
Mike Doty                      kingtaco -at- gentoo.org
Gentoo/AMD64 Strategic Lead
Gentoo Council
Gentoo Developer Relations
Gentoo Recruitment Lead
Gentoo Infrastructure
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