The support for multiple serial interfaces as implemented is mainly intended to allow for modem dial-in / dial-out while still being able to use a serial console on a (different) serial port. MPC8XX Specific =============== At the moment, the ports must be split on a SMC and a SCC port on a 8xx processor; other configurations are not (yet) supported. Support for hardware handshake has not been implemented yet (but is in the works). *) The default console depends on the keys pressed: - SMC if keys not pressed (modem not enabled) - SCC if keys pressed (modem enabled) *) The console can be switched to SCC by any of the following commands: setenv stdout serial_scc setenv stdin serial_scc setenv stderr serial_scc *) The console can be switched to SMC by any of the following commands: setenv stdout serial_smc setenv stdin serial_smc setenv stderr serial_smc *) If a file descriptor is set to "serial" then the current serial device will be used which, in turn, can be switched by above commands. *) The baudrate is the same for all serial devices. But it can be switched just after switching the console: setenv sout serial_scc; setenv baudrate 38400 After that press 'enter' at the SCC console. Note that baudrates <38400 are not allowed on LWMON with watchdog enabled (see CFG_BAUDRATE_TABLE in include/configs/lwmon.h). PPC4XX Specific =============== *) The default console is UART0 *) The console can be switched to UART1 by any of the following commands: setenv stdout serial1 setenv stderr serial1 setenv stdin serial1 *) The console can be switched to UART0 by any of the following commands: setenv stdout serial0 setenv stderr serial0 setenv stdin serial0 MPC5xxx Specific ================ Up to two PSCs can be used as console. Support for hardware handshake has not been implemented yet. *) The first (default) console port is defined by: #define CONFIG_PSC_CONSOLE *) The second (alternative) console port is defined by: #define CONFIG_PSC_CONSOLE2 *) Commands to switch to the second console: setenv stdout serial1 setenv stderr serial1 setenv stdin serial1 *) Commands to switch to the first console: setenv stdout serial0 setenv stderr serial0 setenv stdin serial0 *) If a file descriptor is set to "serial" then the current serial device will be used.