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Arcom Embedded Linux Technical Manual Configuring AEL

Configuring serial ports using setserial

You can configure serial ports using the setserial tool. This section provides a brief

overview of the setserial tool. For more detailed information, refer to the setserial(8)

man page on your host system, or see setserial.sourceforge.net/setserial-man.html

You can view the current configuration of a serial port by passing the device to

setserial. For example, use the following command to view the configuration of COM1,

which is /dev/ttyS0:

# setserial /dev/ttyS0

You can obtain more detailed information by passing the –a flag, as follows:

# setserial –a /dev/ttyS0

Passing additional options to setserial configures the serial port. The following table

outlines the common options:

Option Description

port port_number

Sets the I/O port used by this serial port.

irq irq_number

Sets the IRQ used by this serial port.

uart uart_type

Sets the UART type. Permitted types are none, 8250, 16450,

16550, 16550A, 16650, 16650V2, 16654, 16750, 16850, 16950

and 16954.

autoconfig

Causes the kernel to attempt to automatically detect the UART

type. If the auto_irq option has been given, it also attempts to

determine the IRQ.

This option must be given after the port and irq (or auto_irq)

options.

auto_irq

Causes the kernel to attempt to automatically determine the IRQ

to use when performing automatic configuration.

It is much safer, however, to explicitly configure the IRQ using the

irq option. You can disable this option by prefixing it with a

carat (^).

baud_base

Sets the base baud rate. This is the clock frequency divided by

16.

The default base baud rate is normally either 115200 or the

maximum baud base the port is capable of. In some cases,

however, the default is 0. If so, you cannot set any other options

until you have set a suitable baud_base. You can do this by

passing baud_base as the first option.

Further options are described in the setserial (8) man page.

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Eurotech ZEUS Manual de usuario Pagina 14