| 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. |