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CONFIG_SERIAL_8250_CONSOLE: Console on 8250/16550 and compatible serial port

General informations

The Linux kernel configuration item CONFIG_SERIAL_8250_CONSOLE has multiple definitions:

Console on 8250/16550 and compatible serial port found in drivers/serial/Kconfig

The configuration item CONFIG_SERIAL_8250_CONSOLE:

Help text

If you say Y here, it will be possible to use a serial port as the system console (the system console is the device which receives all kernel messages and warnings and which allows logins in single user mode). This could be useful if some terminal or printer is connected to that serial port.

Even if you say Y here, the currently visible virtual console (/dev/tty0) will still be used as the system console by default, but you can alter that using a kernel command line option such as "console=ttyS1". (Try "man bootparam" or see the documentation of your boot loader (grub or lilo or loadlin) about how to pass options to the kernel at boot time.)

If you don't have a VGA card installed and you say Y here, the kernel will automatically use the first serial line, /dev/ttyS0, as system console.

You can set that using a kernel command line option such as "console=uart8250,io,0x3f8,9600n8" "console=uart8250,mmio,0xff5e0000,115200n8". and it will switch to normal serial console when the corresponding port is ready. "earlycon=uart8250,io,0x3f8,9600n8" "earlycon=uart8250,mmio,0xff5e0000,115200n8". it will not only setup early console.

If unsure, say N.

Console on 8250/16550 and compatible serial port found in drivers/tty/serial/8250/Kconfig

The configuration item CONFIG_SERIAL_8250_CONSOLE:

Help text

If you say Y here, it will be possible to use a serial port as the system console (the system console is the device which receives all kernel messages and warnings and which allows logins in single user mode). This could be useful if some terminal or printer is connected to that serial port.

Even if you say Y here, the currently visible virtual console (/dev/tty0) will still be used as the system console by default, but you can alter that using a kernel command line option such as "console=ttyS1". (Try "man bootparam" or see the documentation of your boot loader (grub or lilo or loadlin) about how to pass options to the kernel at boot time.)

If you don't have a VGA card installed and you say Y here, the kernel will automatically use the first serial line, /dev/ttyS0, as system console.

You can set that using a kernel command line option such as "console=uart8250,io,0x3f8,9600n8" "console=uart8250,mmio,0xff5e0000,115200n8". and it will switch to normal serial console when the corresponding port is ready. "earlycon=uart8250,io,0x3f8,9600n8" "earlycon=uart8250,mmio,0xff5e0000,115200n8". it will not only setup early console.

If unsure, say N.

Console on 8250/16550 and compatible serial port found in drivers/tty/serial/Kconfig

The configuration item CONFIG_SERIAL_8250_CONSOLE:

Help text

If you say Y here, it will be possible to use a serial port as the system console (the system console is the device which receives all kernel messages and warnings and which allows logins in single user mode). This could be useful if some terminal or printer is connected to that serial port.

Even if you say Y here, the currently visible virtual console (/dev/tty0) will still be used as the system console by default, but you can alter that using a kernel command line option such as "console=ttyS1". (Try "man bootparam" or see the documentation of your boot loader (grub or lilo or loadlin) about how to pass options to the kernel at boot time.)

If you don't have a VGA card installed and you say Y here, the kernel will automatically use the first serial line, /dev/ttyS0, as system console.

You can set that using a kernel command line option such as "console=uart8250,io,0x3f8,9600n8" "console=uart8250,mmio,0xff5e0000,115200n8". and it will switch to normal serial console when the corresponding port is ready. "earlycon=uart8250,io,0x3f8,9600n8" "earlycon=uart8250,mmio,0xff5e0000,115200n8". it will not only setup early console.

If unsure, say N.

Hardware

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