blob: 40f78159f59f40432cf863a5c6912d15a06a89e6 [file] [log] [blame]
wdenk281e00a2004-08-01 22:48:16 +00001The support for multiple serial interfaces as implemented is mainly
2intended to allow for modem dial-in / dial-out while still being able
3to use a serial console on a (different) serial port.
4
wdenkff36fd82005-01-09 22:28:56 +00005MPC8XX Specific
6===============
wdenk281e00a2004-08-01 22:48:16 +00007At the moment, the ports must be split on a SMC and a SCC port on a
88xx processor; other configurations are not (yet) supported.
9
10Support for hardware handshake has not been implemented yet (but is
11in 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
30will 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
33just after switching the console:
34
35 setenv sout serial_scc; setenv baudrate 38400
36
37After that press 'enter' at the SCC console. Note that baudrates <38400
38are not allowed on LWMON with watchdog enabled (see CFG_BAUDRATE_TABLE in
39include/configs/lwmon.h).
wdenkff36fd82005-01-09 22:28:56 +000040
41
42PPC4XX 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
Wolfgang Denkc12cffc2006-06-16 17:04:45 +020055
56MPC5xxx Specific
57================
58
59Up to two PSCs can be used as console.
60
61Support 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.