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

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Message-ID: <4C548F7D.6000509@zytor.com>
Date:	Sat, 31 Jul 2010 14:02:53 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Cyrill Gorcunov <gorcunov@...il.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 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

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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