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authorwdenk <wdenk>2004-08-01 22:48:16 +0000
committerwdenk <wdenk>2004-08-01 22:48:16 +0000
commit281e00a3be453a169d854f824a460359d10f92bb (patch)
tree43dab398f1d6f601bb44df108427f7e0c611d68d /doc/README.serial_multi
parentcfca5e604d5692f081cc1a9185ca5dc6dc77599d (diff)
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* Code cleanup
* Patch by Sascha Hauer, 28 Jun: - add generic support for Motorola i.MX architecture - add support for mx1ads, mx1fs2 and scb9328 boards * Patches by Marc Leeman, 23 Jul 2004: - Add define for the PCI/Memory Buffer Configuration Register - corrected comments in cpu/mpc824x/cpu_init.c * Add support for multiple serial interfaces (for example to allow modem dial-in / dial-out)
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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.
+
+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).