Add support for CONFIG_SERIAL_MULTI on MPC5xxx

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.

1 files changed, 26 insertions, 0 deletions

diff --git a/doc/README.serial_multi b/doc/README.serial_multi
index a8d48fc..40f7815 100644
--- a/doc/README.serial_multi
+++ b/doc/README.serial_multi
@@ -52,3 +52,29 @@ PPC4XX Specific
 	setenv stdout serial0
 	setenv stderr serial0
 	setenv stdin serial0
+
+MPC5xxx Specific
+================
+
+Up to two PSCs can be used as console.
+
+Support for hardware handshake has not been implemented yet.
+
+*) The first (default) console port is defined by:
+	#define CONFIG_PSC_CONSOLE <PSC number>
+
+*) The second (alternative) console port is defined by:
+	#define CONFIG_PSC_CONSOLE2 <PSC number>
+
+*) Commands to switch to the second console:
+	setenv stdout serial1
+	setenv stderr serial1
+	setenv stdin serial1
+
+*) Commands to switch to the first console:
+	setenv stdout serial0
+	setenv stderr serial0
+	setenv stdin serial0
+
+*) If a file descriptor is set to "serial" then the
+   current serial device will be used.