linux-kernel - Re: [PATCH] i486 CR4 oops, no_console

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Message-ID: <48AAEFBE.5060406@zytor.com>
Date:	Tue, 19 Aug 2008 09:07:26 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	David Fries <david@...es.net>, linux-kernel@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...k.pl>, Pavel Machek <pavel@....cz>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] i486 CR4 oops, no_console_suspend

Ingo Molnar wrote:
> 
> i've had trouble no end with getting even kernel messages out to the 
> serial console during critical phases of suspend/resume. (especially in 
> combination with earlyprintk=ttyS0 - not surprisingly)
> 
> Especially during resume the UART is initialized back to something 
> really slow - 300 bauds or 9600 bauds. (depends on the chipset i guess) 
> So even though it works, it will only worked reliably when i 
> standardized all my baud settings to that very low setting.
> 

Probably depends on the BIOS, actually; I suspect you end up with the 
standard BIOS setting, which is *usually* 9600 bps.

	-hpa
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