Changes between Version 6 and Version 7 of serial

Timestamp:

03/13/2018 10:49:25 PM (7 years ago)

Author:

Tim Harvey

Comment:

added details on setting serial console for newport

serial

@@ -646 +646 @@
 See [wiki:gpio gpio] for details on using GPIO from Linux userspace or use the U-Boot bootloader {{{gpio}}} command.
 
+The CN80XX / CN81XX has 4 TTL level UARTs with the following mapping:
+||= UART =||= device-tree alias =||= Linux device =||
+|| UART0 || serial0 || /dev/ttyAMA0 ||
+|| UART1 || serial1 || /dev/ttyAMA1 ||
+|| UART2 || serial2 || /dev/ttyAMA2 ||
+|| UART3 || serial3 || /dev/ttyAMA3 ||
+
+The Linux kernel uses the {{{console}}} parameter from the Kernel cmdline to specify the serial console. You can usually modify the 'console' U-boot env variable if you want to change the default console UART as it typically gets passed on to the kernel:
+{{{
+Newport > setenv console '/dev/ttyAMA2,115200n8'; saveenv
+}}}
+ * Specify that Linux and userspace use UART2
+
+The U-Boot Bootloader (as well as kernel if the {{{console}}} cmdline is not specified) uses the device-tree 'chosen' node 'stdout-path' property to specify serial console. For example the default is specified in the cn81xx-linux.dtsi:
+{{{
+        chosen {
+               stdout-path = "serial0:115200n8";
+        };
+}}}
+
+If you wish to change the serial console in the BDK or ATF, you will need to modify the source code which will take some digging.
 
 === Laguna: GW2382 ===