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Re: [PATCH 1/1] x86: Add config option to setup early serial console
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From:
Mike Travis <travis@...>
To: Yinghai Lu <yhlu.kernel@...>
Cc: Ingo Molnar <mingo@...>, Andrew Morton <akpm@...>, Thomas Gleixner <tglx@...>, H. Peter Anvin <hpa@...>, <linux-kernel@...>
Subject:
Re: [PATCH 1/1] x86: Add config option to setup early serial console
Date: Thursday, June 12, 2008 - 7:01 pm
Yinghai Lu wrote:
quoted text
> On Thu, Jun 12, 2008 at 3:42 PM, Mike Travis <travis@sgi.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@sgi.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
I'll rework the patch to enable the serial console as early as possible. Currently, it's done quite a ways down in start_kernel(). Thanks, Mike --
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Messages in current thread:
[PATCH 1/1] x86: Add config option to setup early serial con...
, Mike Travis
, (Thu Jun 12, 6:42 pm)
Re: [PATCH 1/1] x86: Add config option to setup early serial...
, Yinghai Lu
, (Thu Jun 12, 6:48 pm)
Re: [PATCH 1/1] x86: Add config option to setup early serial...
, Mike Travis
, (Thu Jun 12, 7:01 pm)
Re: [PATCH 1/1] x86: Add config option to setup early serial...
, Ingo Molnar
, (Wed Jun 18, 8:13 am)
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