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Patch by Martin Krause, 8 Jun 2006 This patch supports two serial consoles on boards with a MPC5xxx CPU. The console can be switched at runtime by setting stdin, stdout and stderr to the desired serial interface (serial0 or serial1). The PSCs to be used as console port are definded by CONFIG_PSC_CONSOLE and CONFIG_PSC_CONSOLE2. See README.serial_multi for details.
81 lines
2.3 KiB
Plaintext
81 lines
2.3 KiB
Plaintext
The support for multiple serial interfaces as implemented is mainly
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intended to allow for modem dial-in / dial-out while still being able
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to use a serial console on a (different) serial port.
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MPC8XX Specific
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===============
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At the moment, the ports must be split on a SMC and a SCC port on a
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8xx processor; other configurations are not (yet) supported.
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Support for hardware handshake has not been implemented yet (but is
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in the works).
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*) The default console depends on the keys pressed:
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- SMC if keys not pressed (modem not enabled)
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- SCC if keys pressed (modem enabled)
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*) The console can be switched to SCC by any of the following commands:
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setenv stdout serial_scc
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setenv stdin serial_scc
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setenv stderr serial_scc
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*) The console can be switched to SMC by any of the following commands:
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setenv stdout serial_smc
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setenv stdin serial_smc
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setenv stderr serial_smc
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*) If a file descriptor is set to "serial" then the current serial device
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will be used which, in turn, can be switched by above commands.
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*) The baudrate is the same for all serial devices. But it can be switched
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just after switching the console:
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setenv sout serial_scc; setenv baudrate 38400
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After that press 'enter' at the SCC console. Note that baudrates <38400
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are not allowed on LWMON with watchdog enabled (see CFG_BAUDRATE_TABLE in
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include/configs/lwmon.h).
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PPC4XX Specific
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===============
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*) The default console is UART0
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*) The console can be switched to UART1 by any of the following commands:
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setenv stdout serial1
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setenv stderr serial1
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setenv stdin serial1
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*) The console can be switched to UART0 by any of the following commands:
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setenv stdout serial0
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setenv stderr serial0
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setenv stdin serial0
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MPC5xxx Specific
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================
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Up to two PSCs can be used as console.
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Support for hardware handshake has not been implemented yet.
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*) The first (default) console port is defined by:
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#define CONFIG_PSC_CONSOLE <PSC number>
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*) The second (alternative) console port is defined by:
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#define CONFIG_PSC_CONSOLE2 <PSC number>
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*) Commands to switch to the second console:
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setenv stdout serial1
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setenv stderr serial1
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setenv stdin serial1
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*) Commands to switch to the first console:
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setenv stdout serial0
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setenv stderr serial0
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setenv stdin serial0
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*) If a file descriptor is set to "serial" then the
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current serial device will be used.
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