linux-kernel - Re: [PATCH] x86,setup: add serial_console_port_base in boot

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Message-ID: <20100731213138.GC29357@lenovo>
Date:	Sun, 1 Aug 2010 01:31:38 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Yinghai Lu <yinghai@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Pekka Enberg <penberg@...helsinki.fi>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86,setup: add serial_console_port_base in boot_params

On Sat, Jul 31, 2010 at 02:02:53PM -0700, H. Peter Anvin wrote:
> On 07/31/2010 11:32 AM, Cyrill Gorcunov wrote:
> >>
> >> No, this is the internal part of the boot protocol, so it's not an issue.
> >>
> > 
> > Peter, I didn't mean any issue here, I meant that bootloaders don't know about
> > this field yet and they will have to update own sources to pass port value
> > at proper place of boot params. Or I miss something?
> > 
> 
> Boot loaders that use the 16-bit entry point are unaffected.
> 
> Boot loaders which use the 32-bit entry point but properly clears the
> zero page simply will not have the feature.
> 
> Boot loaders which use the 32-bit entry point but doesn't clear the zero
> page are broken.
> 
> 	-hpa
>

Well, Peter, seems I messed boot params with setup header. So I don't see
any user of this field then, hmm...

	-- Cyrill
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