linux-kernel - Re: [PATCH 1/1] x86: Add config option to setup early serial console

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Message-Id: <20080612154600.fac8cc6b.akpm@linux-foundation.org>
Date:	Thu, 12 Jun 2008 15:46:00 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mike Travis <travis@....com>
Cc:	mingo@...e.hu, tglx@...utronix.de, hpa@...or.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] x86: Add config option to setup early serial
 console

On Thu, 12 Jun 2008 15:38:03 -0700
Mike Travis <travis@....com> wrote:

>  * Add config option EARLY_SERIAL_CONSOLE to enable early
>    printk's to be directed to the serial console.
> 
> Based on linux-next
> 
> Signed-off-by: Mike Travis <travis@....com>
> ---
> 
> ---
>  arch/x86/Kconfig.debug         |    9 +++++++++
>  arch/x86/kernel/early_printk.c |    4 ++++
>  2 files changed, 13 insertions(+)
> 
> --- linux-2.6-next.orig/arch/x86/Kconfig.debug
> +++ linux-2.6-next/arch/x86/Kconfig.debug
> @@ -29,6 +29,15 @@ config EARLY_PRINTK
>  	  with klogd/syslogd or the X server. You should normally N here,
>  	  unless you want to debug such a crash.
>  
> +config EARLY_SERIAL_CONSOLE
> +	bool "Early Serial Console"
> +	default m
> +	help
> +	  Initializes the early console to be the serial port.  The default
> +	  is to use the VGA console.
> +
> +	  This is useful for server systems that do not have a VGA console.
> +
>  config DEBUG_STACKOVERFLOW
>  	bool "Check for stack overflows"
>  	depends on DEBUG_KERNEL
> --- linux-2.6-next.orig/arch/x86/kernel/early_printk.c
> +++ linux-2.6-next/arch/x86/kernel/early_printk.c
> @@ -193,7 +193,11 @@ static struct console simnow_console = {
>  };
>  
>  /* Direct interface for emergencies */
> +#ifdef CONFIG_EARLY_SERIAL_CONSOLE
> +static struct console *early_console = &early_serial_console;
> +#else
>  static struct console *early_console = &early_vga_console;
> +#endif
>  static int early_console_initialized;
>  
>  void early_printk(const char *fmt, ...)
> 

Confused.  What's wrong with console=uart,...?


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