doc/README.serial_multi

   1 The support for multiple serial interfaces as implemented is mainly
   2 intended to allow for modem dial-in / dial-out while still being able
   3 to use a serial console on a (different) serial port.
   4
   5 MPC8XX Specific
   6 ===============
   7 At the moment, the ports must be split on a SMC and a SCC port  on  a
   8 8xx processor; other configurations are not (yet) supported.
   9
  10 Support for hardware handshake has not been implemented yet (but is
  11 in the works).
  12
  13 *) The default console depends on the keys pressed:
  14         - SMC if keys not pressed (modem not enabled)
  15         - SCC if keys pressed (modem enabled)
  16
  17 *) The console can be switched to SCC by any of the following commands:
  18
  19         setenv stdout serial_scc
  20         setenv stdin serial_scc
  21         setenv stderr serial_scc
  22
  23 *) The console can be switched to SMC by any of the following commands:
  24
  25         setenv stdout serial_smc
  26         setenv stdin serial_smc
  27         setenv stderr serial_smc
  28
  29 *) If a file descriptor is set to "serial" then the current serial device
  30 will be used which, in turn, can be switched by above commands.
  31
  32 *) The baudrate is the same for all serial devices. But it can be switched
  33 just after switching the console:
  34
  35         setenv sout serial_scc; setenv baudrate 38400
  36
  37 After that press 'enter' at the SCC console. Note that baudrates <38400
  38 are not allowed on LWMON with watchdog enabled (see CFG_BAUDRATE_TABLE in
  39 include/configs/lwmon.h).
  40
  41
  42 PPC4XX Specific
  43 ===============
  44 *) The default console is UART0
  45
  46 *) The console can be switched to UART1 by any of the following commands:
  47         setenv stdout serial1
  48         setenv stderr serial1
  49         setenv stdin serial1
  50
  51 *) The console can be switched to UART0 by any of the following commands:
  52         setenv stdout serial0
  53         setenv stderr serial0
  54         setenv stdin serial0
  55
  56 MPC5xxx Specific
  57 ================
  58
  59 Up to two PSCs can be used as console.
  60
  61 Support for hardware handshake has not been implemented yet.
  62
  63 *) The first (default) console port is defined by:
  64         #define CONFIG_PSC_CONSOLE <PSC number>
  65
  66 *) The second (alternative) console port is defined by:
  67         #define CONFIG_PSC_CONSOLE2 <PSC number>
  68
  69 *) Commands to switch to the second console:
  70         setenv stdout serial1
  71         setenv stderr serial1
  72         setenv stdin serial1
  73
  74 *) Commands to switch to the first console:
  75         setenv stdout serial0
  76         setenv stderr serial0
  77         setenv stdin serial0
  78
  79 *) If a file descriptor is set to "serial" then the
  80    current serial device will be used.