serial: add an option that selects uart rpmsg as console

Author: raiden00pl

arch/arm/src/common/arm_internal.h

@@ -57,6 +57,9 @@
 #  elif defined(CONFIG_SERIAL_RTT_CONSOLE)
 #    undef  USE_SERIALDRIVER
 #    undef  USE_EARLYSERIALINIT
+#  elif defined(CONFIG_RPMSG_UART_CONSOLE)
+#    undef  USE_SERIALDRIVER
+#    undef  USE_EARLYSERIALINIT
 #  else
 #    define USE_SERIALDRIVER 1
 #    define USE_EARLYSERIALINIT 1

arch/arm64/src/common/arm64_internal.h

@@ -58,6 +58,9 @@
 #  elif defined(CONFIG_SERIAL_RTT_CONSOLE)
 #    undef  USE_SERIALDRIVER
 #    undef  USE_EARLYSERIALINIT
+#  elif defined(CONFIG_RPMSG_UART_CONSOLE)
+#    undef  USE_SERIALDRIVER
+#    undef  USE_EARLYSERIALINIT
 #  else
 #    define USE_SERIALDRIVER 1
 #    define USE_EARLYSERIALINIT 1

drivers/serial/Kconfig

@@ -81,6 +81,16 @@ config RPMSG_UART
 	select SERIAL_REMOVABLE
 	select SERIAL_IFLOWCONTROL
 
+config RPMSG_UART_CONSOLE
+	bool "UART rpmsg console support"
+	default n
+	depends on RPMSG_UART
+	---help---
+		Register the UART rpmsg device as /dev/console so that is will be used
+		as the console device.
+		NOTE: support for this option must be implemented in the board logic by
+		setting the \"isconsole\" argument in the uart_rpmsg_init() function to true.
+
 #
 # Standard serial driver configuration
 #