console: Add console for GDB

Connection of UARTs to GDB stub got lost in the console transition
process, bring it back. In theory, GDB stub should work also over
usbdebug, but that solution is not really tested at all yet.

Change-Id: I90e05e8132889e788b92e055ee191f35add43bbc
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5343
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
diff --git a/src/include/console/uart.h b/src/include/console/uart.h
index b08cd9b..d4020c3 100644
--- a/src/include/console/uart.h
+++ b/src/include/console/uart.h
@@ -69,6 +69,14 @@
 static inline void __uart_tx_flush(void)	{}
 #endif
 
+#if CONFIG_GDB_STUB && (ENV_ROMSTAGE || ENV_RAMSTAGE)
+#define CONFIG_UART_FOR_GDB 	CONFIG_UART_FOR_CONSOLE
+static inline void __gdb_hw_init(void)	{ uart_init(CONFIG_UART_FOR_GDB); }
+static inline void __gdb_tx_byte(u8 data)	{ uart_tx_byte(CONFIG_UART_FOR_GDB, data); }
+static inline void __gdb_tx_flush(void)	{ uart_tx_flush(CONFIG_UART_FOR_GDB); }
+static inline u8 __gdb_rx_byte(void)		{ return uart_rx_byte(CONFIG_UART_FOR_GDB); }
+#endif
+
 #endif /* __ROMCC__ */
 
 #endif /* CONSOLE_UART_H */