| 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 CONFIG_SYS_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 <PSC number> | |
| *) The second (alternative) console port is defined by: | |
| #define CONFIG_PSC_CONSOLE2 <PSC number> | |
| *) 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. |