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https://github.com/AsahiLinux/u-boot
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80 lines
2.3 KiB
Text
80 lines
2.3 KiB
Text
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 CONFIG_SYS_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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