1 The support for multiple serial interfaces as implemented is mainly 2 intended to allow for modem dial-in / dial-out while still being able 3 to use a serial console on a (different) serial port. 4 5 MPC8XX Specific 6 =============== 7 At the moment, the ports must be split on a SMC and a SCC port on a 8 8xx processor; other configurations are not (yet) supported. 9 10 Support for hardware handshake has not been implemented yet (but is 11 in the works). 12 13 *) The default console depends on the keys pressed: 14 - SMC if keys not pressed (modem not enabled) 15 - SCC if keys pressed (modem enabled) 16 17 *) The console can be switched to SCC by any of the following commands: 18 19 setenv stdout serial_scc 20 setenv stdin serial_scc 21 setenv stderr serial_scc 22 23 *) The console can be switched to SMC by any of the following commands: 24 25 setenv stdout serial_smc 26 setenv stdin serial_smc 27 setenv stderr serial_smc 28 29 *) If a file descriptor is set to "serial" then the current serial device 30 will be used which, in turn, can be switched by above commands. 31 32 *) The baudrate is the same for all serial devices. But it can be switched 33 just after switching the console: 34 35 setenv sout serial_scc; setenv baudrate 38400 36 37 After that press 'enter' at the SCC console. Note that baudrates <38400 38 are not allowed on LWMON with watchdog enabled (see CONFIG_SYS_BAUDRATE_TABLE in 39 include/configs/lwmon.h). 40 41 42 PPC4XX Specific 43 =============== 44 *) The default console is UART0 45 46 *) The console can be switched to UART1 by any of the following commands: 47 setenv stdout serial1 48 setenv stderr serial1 49 setenv stdin serial1 50 51 *) The console can be switched to UART0 by any of the following commands: 52 setenv stdout serial0 53 setenv stderr serial0 54 setenv stdin serial0 55
