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- 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 <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.
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