1The support for multiple serial interfaces as implemented is mainly 2intended to allow for modem dial-in / dial-out while still being able 3to use a serial console on a (different) serial port. 4 5MPC8XX Specific 6=============== 7At the moment, the ports must be split on a SMC and a SCC port on a 88xx processor; other configurations are not (yet) supported. 9 10Support for hardware handshake has not been implemented yet (but is 11in 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 30will 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 33just after switching the console: 34 35 setenv sout serial_scc; setenv baudrate 38400 36 37After that press 'enter' at the SCC console. Note that baudrates <38400 38are not allowed on LWMON with watchdog enabled (see CONFIG_SYS_BAUDRATE_TABLE in 39include/configs/lwmon.h). 40 41 42PPC4XX 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 56MPC5xxx Specific 57================ 58 59Up to two PSCs can be used as console. 60 61Support for hardware handshake has not been implemented yet. 62 63*) The first (default) console port is defined by: 64 #define CONFIG_PSC_CONSOLE <PSC number> 65 66*) The second (alternative) console port is defined by: 67 #define CONFIG_PSC_CONSOLE2 <PSC number> 68 69*) Commands to switch to the second console: 70 setenv stdout serial1 71 setenv stderr serial1 72 setenv stdin serial1 73 74*) Commands to switch to the first console: 75 setenv stdout serial0 76 setenv stderr serial0 77 setenv stdin serial0 78 79*) If a file descriptor is set to "serial" then the 80 current serial device will be used. 81