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

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Message-ID: <20080821041721.GE17528@spacedout.fries.net>
Date:	Wed, 20 Aug 2008 23:17:21 -0500
From:	David Fries <david@...es.net>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Ingo Molnar <mingo@...e.hu>, 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

On Tue, Aug 19, 2008 at 09:07:26AM -0700, H. Peter Anvin wrote:
> 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.

I have grub, the kernel, and a getty all set to 115200, for suspend,
resume, or reboot it's always 115200.  With grub there's no BIOS
guessing, it sets it to a configured state.

-- 
David Fries <david@...es.net>
http://fries.net/~david/ (PGP encryption key available)
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