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CONFIG_SERIAL_MUX: Serial MUX support

General informations

The Linux kernel configuration item CONFIG_SERIAL_MUX has multiple definitions:

Serial MUX support found in drivers/serial/Kconfig

The configuration item CONFIG_SERIAL_MUX:

Help text

Saying Y here will enable the hardware MUX serial driver for the Nova and K class systems. The hardware MUX is not 8250/16550 compatible therefore the /dev/ttyB0 device is shared between the Serial MUX and the PDC software console. The following steps need to be completed to use the Serial MUX:

1. create the device entry (mknod /dev/ttyB0 c 11 0) 2. Edit the /etc/inittab to start a getty listening on /dev/ttyB0 3. Add device ttyB0 to /etc/securetty (if you want to log on as root on this console.) 4. Change the kernel command console parameter to: console=ttyB0

Serial MUX support found in drivers/tty/serial/Kconfig

The configuration item CONFIG_SERIAL_MUX:

Help text

Saying Y here will enable the hardware MUX serial driver for the Nova, K class systems and D class with a 'remote control card'. The hardware MUX is not 8250/16550 compatible therefore the /dev/ttyB0 device is shared between the Serial MUX and the PDC software console. The following steps need to be completed to use the Serial MUX:

1. create the device entry (mknod /dev/ttyB0 c 11 0) 2. Edit the /etc/inittab to start a getty listening on /dev/ttyB0 3. Add device ttyB0 to /etc/securetty (if you want to log on as root on this console.) 4. Change the kernel command console parameter to: console=ttyB0

Hardware

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