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

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Message-ID: <86802c440806121548s71ff31eapc5f389cfa94ea237@mail.gmail.com>
Date:	Thu, 12 Jun 2008 15:48:19 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Mike Travis" <travis@....com>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] x86: Add config option to setup early serial console

On Thu, Jun 12, 2008 at 3:42 PM, 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 n
> +       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, ...)
>

can you check if it can work with
console=uart8250,io,0x3f8,115200

that is early console, and will switch to normal console automatically

YH
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