#LINUX SERIAL CONSOLE SETUP MANUAL#

Hence, they are not compatible with a 16550A UART, and the autoconfiguration process will correctly identify them as 16450's.

This is important, because they do not have a transmit FIFO. What they have is a 16450 compatible UART with a 1k receive buffer to prevent receiver overruns. They do not have really have a 16550A compatible UART instead Some internal modems are billed as having a '16550A UART with a 1k buffer'. Using UART type none will disable the port. This option is used to set the UART type. The irq option sets the hardware IRQ, as described above. The port option sets the I/O port, as described above. The following parameters can be assigned to a serial port.Īll argument values are assumed to be in decimal unless preceeded by '0x'. This is related to the automatic saving of serial flags using the -G flag. z Zero out the serial flags before starting to set flags. This option is no longer relevant in Linux kernels after version 2.1. W Do wild interrupt initialization and exit. Setserial will print additional status output. Setserial will print fewer lines of output. G Print out the configuration information of the serial port in a form which can be fed back to setserial as command-line arguments. b When reporting the configuration of a serial device, print a summary of the device's configuration, which might be suitable for printing during the bootup a When reporting the configuration of a serial device, print all available information. Options Setserial accepts the following options:

#LINUX SERIAL CONSOLE SETUP MANUAL#

Users, however, and these will be noted as exceptions in this manual page. A few serial port parameters can be set by normal Without the -g option, the first argument to setserial is interpreted as the device to be modified or characteristics to be printed, and anyĪdditional arguments are interpreted as parameters which should be assigned to that serial device.įor the most part, superuser privilege is required to set the configuration parameters of a serial port.

If the -g option is given, the arguments to setserial are interpreted as a list of devices for which the characteristics of those devices should be IRQ line, its 'baud base,' and some of its operational flags.

If no parameters are specified, setserial will print out the port type (i.e., 8250, 16450, 16550, 16550A, etc.), the hardware I/O port, the hardware The device argument or arguments specifies the serial device which should be configured or interrogated. Typically it is calledįrom an rc.serial script, which is usually run out of /etc/rc.local. In order to initializeĪny additional serial ports, or to change the COM 1-4 ports to a nonstadard configuration, the setserial program should be used. Interpreted as the Secure Attention Key, and so on.ĭuring the normal bootup process, only COM ports 1-4 are initialized, using the default I/O ports and IRQ values, as listed below. This information includes what I/O port and IRQ a particular serial port is using, and whether or not the break key should be Setserial is a program designed to set and/or report the configuration informationĪssociated with a serial port.

Linux serial console setup