Merge pull request #1680 from pbatard/rpi3-runtime-uart

rpi3: add RPI3_RUNTIME_UART build option

docs/plat/rpi3.rst

@@ -231,6 +231,10 @@ The following build options are supported:
   ``RPI3_DIRECT_LINUX_BOOT=1``. This option allows to specify the location of a
   DTB in memory.
 
+- ``RPI3_RUNTIME_UART``: Indicates whether the UART should be used at runtime
+  or disabled. ``-1`` (default) disables the runtime UART. Any other value
+  enables the default UART (currently UART1) for runtime messages.
+
 - ``BL32``: This port can load and run OP-TEE. The OP-TEE image is optional.
   Please use the code from `here <https://github.com/OP-TEE/optee_os>`__.
   Build the Trusted Firmware with option ``BL32=tee-header_v2.bin

plat/rpi3/platform.mk

@@ -109,6 +109,10 @@ RPI3_BL33_IN_AARCH32		:= 0
 # Assume that BL33 isn't the Linux kernel by default
 RPI3_DIRECT_LINUX_BOOT		:= 0
 
+# UART to use at runtime. -1 means the runtime UART is disabled.
+# Any other value means the default UART will be used.
+RPI3_RUNTIME_UART               := -1
+
 # BL32 location
 RPI3_BL32_RAM_LOCATION	:= tdram
 ifeq (${RPI3_BL32_RAM_LOCATION}, tsram)
@@ -126,6 +130,7 @@ $(eval $(call add_define,RPI3_BL32_RAM_LOCATION_ID))
 $(eval $(call add_define,RPI3_BL33_IN_AARCH32))
 $(eval $(call add_define,RPI3_DIRECT_LINUX_BOOT))
 $(eval $(call add_define,RPI3_PRELOADED_DTB_BASE))
+$(eval $(call add_define,RPI3_RUNTIME_UART))
 
 # Verify build config
 # -------------------

plat/rpi3/rpi3_common.c

@@ -96,6 +96,10 @@ static console_16550_t rpi3_console;
 
 void rpi3_console_init(void)
 {
+	int console_scope = CONSOLE_FLAG_BOOT;
+#if RPI3_RUNTIME_UART != -1
+	console_scope |= CONSOLE_FLAG_RUNTIME;
+#endif
 	int rc = console_16550_register(PLAT_RPI3_UART_BASE,
 					PLAT_RPI3_UART_CLK_IN_HZ,
 					PLAT_RPI3_UART_BAUDRATE,
@@ -109,8 +113,7 @@ void rpi3_console_init(void)
 		panic();
 	}
 
-	console_set_scope(&rpi3_console.console,
-			  CONSOLE_FLAG_BOOT | CONSOLE_FLAG_RUNTIME);
+	console_set_scope(&rpi3_console.console, console_scope);
 }
 
 /*******************************************************************************