ARM: mxs: Add mx28evk_auart_console target

The target uses AUART 3 instead of the DUART for console output.
Signed-off-by: NAndreas Wass <andreas.wass@dalelven.com>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Marek Vasut <marex@denx.de>

boards.cfg

@@ -203,6 +203,7 @@ mx23evk                      arm         arm926ejs   mx23evk             freesca
 m28evk                       arm         arm926ejs   m28evk              denx           mxs		m28evk
 mx28evk                      arm         arm926ejs   mx28evk             freescale      mxs		mx28evk:ENV_IS_IN_MMC
 mx28evk_nand                 arm         arm926ejs   mx28evk             freescale      mxs		mx28evk:ENV_IS_IN_NAND
+mx28evk_auart_console        arm         arm926ejs   mx28evk             freescale      mxs		mx28evk:MXS_AUART,MXS_AUART_BASE=MXS_UARTAPP3_BASE,ENV_IS_IN_MMC
 sc_sps_1                     arm         arm926ejs   sc_sps_1            schulercontrol mxs
 nhk8815                      arm         arm926ejs   nhk8815             st             nomadik
 nhk8815_onenand              arm         arm926ejs   nhk8815             st             nomadik       nhk8815:BOOT_ONENAND

include/configs/mxs.h

@@ -119,11 +119,16 @@
 /* GPIO */
 #define CONFIG_MXS_GPIO
 
-/* DUART Serial Driver */
+/*
+ * DUART Serial Driver.
+ * Conflicts with AUART driver which can be set by board.
+ */
+#ifndef CONFIG_MXS_AUART
 #define CONFIG_PL011_SERIAL
 #define CONFIG_PL011_CLOCK		24000000
 #define CONFIG_PL01x_PORTS		{ (void *)MXS_UARTDBG_BASE }
 #define CONFIG_CONS_INDEX		0
+#endif
 /* Default baudrate can be overriden by board! */
 #ifndef CONFIG_BAUDRATE
 #define CONFIG_BAUDRATE			115200