Add NXP's i.MX8 SoCs system controller console support

NXP's i.MX8 SoCs with system controller inside support outputting
debug message to system controller's console via calling SCFW API,
since TF-A shares debug console with Linux kernel which will have
confliction if Linux kernel and TF-A's console are both enabled,
this patch adds support for switching TF-A debug console to system
controller to easy TF-A debug.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/libc/putchar.c b/lib/libc/putchar.c
index 037e28ac..1f985bc4 100644
--- a/lib/libc/putchar.c
+++ b/lib/libc/putchar.c
@@ -8,6 +8,8 @@
 
 #include <drivers/console.h>
 
+#pragma weak putchar
+
 int putchar(int c)
 {
 	int res;