linux-kernel - Re: [PATCH v2 03/13] x86: Add macro for 64bit entry startup

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Date:	Tue, 20 Nov 2012 12:55:41 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org, Matt Fleming <matt.fleming@...el.com>
Subject: Re: [PATCH v2 03/13] x86: Add macro for 64bit entry startup_64

On Tue, Nov 20, 2012 at 12:44 PM, H. Peter Anvin <hpa@...or.com> wrote:
> I don't see any point in three flags here.  Let's stick to one flag; then it fits in the existing boot_flags field.

the magic AA55

boot/header.S:boot_flag:        .word 0xAA55

if change that to other value, would it break existing boot loader?
aka old boot loader could boot the new bzImage anymore.

Thanks

Yinghai
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