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The Linux kernel configuration item CONFIG_EARLY_PRINTK has multiple definitions:
The configuration item CONFIG_EARLY_PRINTK:
(none)The configuration item CONFIG_EARLY_PRINTK:
CONFIG_MACH_DECSTATIONThe configuration item CONFIG_EARLY_PRINTK:
( CONFIG_EMBEDDED && CONFIG_DEBUG_KERNEL ) && ( CONFIG_SYS_HAS_EARLY_PRINTK )This option enables special console drivers which allow the kernel to print messages very early in the bootup process.
This is useful for kernel debugging when your machine crashes very early before the console code is initialized. For normal operation, it is not recommended because it looks ugly on some machines and doesn't cooperate with an X server. You should normally say N here, unless you want to debug such a crash.
The configuration item CONFIG_EARLY_PRINTK:
CONFIG_EMBEDDED && CONFIG_DEBUG_KERNELWrite kernel log output directly into the VGA buffer or to a serial port.
This is useful for kernel debugging when your machine crashes very early before the console code is initialized. For normal operation it is not recommended because it looks ugly and doesn't cooperate with klogd/syslogd or the X server. You should normally N here, unless you want to debug such a crash.
The configuration item CONFIG_EARLY_PRINTK:
(none)This option enables special console drivers which allow the kernel to print messages very early in the bootup process.
This is useful for kernel debugging when your machine crashes very early before the console code is initialized. After enabling this feature, you must add "earlyprintk=serial,uart0,57600" to the command line (bootargs). It is safe to say Y here in all cases, as all of this lives in the init section and is thrown away after the kernel boots completely.
The configuration item CONFIG_EARLY_PRINTK:
CONFIG_SH_STANDARD_BIOS || CONFIG_EARLY_SCIF_CONSOLESay Y here to redirect kernel printk messages to the serial port used by the SH-IPL bootloader, starting very early in the boot process and ending when the kernel's serial console is initialised. This option is only useful porting the kernel to a new machine, when the kernel may crash or hang before the serial console is initialised. If unsure, say N.
On devices that are running SH-IPL and want to keep the port initialization consistent while not using the BIOS callbacks, select both the EARLY_SCIF_CONSOLE and SH_STANDARD_BIOS, using the kernel command line option to toggle back and forth.
The configuration item CONFIG_EARLY_PRINTK:
CONFIG_EMBEDDEDWrite kernel log output directly into the VGA buffer or to a serial port.
This is useful for kernel debugging when your machine crashes very early before the console code is initialized. For normal operation it is not recommended because it looks ugly and doesn't cooperate with klogd/syslogd or the X server. You should normally N here, unless you want to debug such a crash.
The configuration item CONFIG_EARLY_PRINTK:
CONFIG_ALPHA_GENERIC || CONFIG_ALPHA_SRMThe configuration item CONFIG_EARLY_PRINTK:
(none)The configuration item CONFIG_EARLY_PRINTK:
(none)The configuration item CONFIG_EARLY_PRINTK:
(none)The configuration item CONFIG_EARLY_PRINTK:
CONFIG_EMBEDDED && CONFIG_DEBUG_KERNELWrite kernel log output directly into the VGA buffer or to a serial port.
This is useful for kernel debugging when your machine crashes very early before the console code is initialized. For normal operation it is not recommended because it looks ugly and doesn't cooperate with klogd/syslogd or the X server. You should normally N here, unless you want to debug such a crash.
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