From: Simon Glass <sjg@chromium.org>
Date: Wed, 23 Jul 2014 12:55:07 +0000 (-0600)
Subject: Add a flag indicating when the serial console is ready
X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=093f79ab88d57b800283b0a172c17167699f4243;p=u-boot.git

Add a flag indicating when the serial console is ready

For sandbox we have a fallback console which is used very early in
U-Boot, before serial drivers are available. Rather than try to guess
when to switch to the real console, add a flag so we can be sure. This
makes sure that sandbox can always output a panic() message, for example,
and avoids silent failure (which is very annoying in sandbox).

Signed-off-by: Simon Glass <sjg@chromium.org>
---

diff --git a/common/console.c b/common/console.c
index 5576dfd94a..898da3935e 100644
--- a/common/console.c
+++ b/common/console.c
@@ -417,7 +417,7 @@ static inline void print_pre_console_buffer(void) {}
 void putc(const char c)
 {
 #ifdef CONFIG_SANDBOX
-	if (!gd) {
+	if (!gd || !(gd->flags & GD_FLG_SERIAL_READY)) {
 		os_putc(c);
 		return;
 	}
@@ -447,7 +447,7 @@ void putc(const char c)
 void puts(const char *s)
 {
 #ifdef CONFIG_SANDBOX
-	if (!gd) {
+	if (!gd || !(gd->flags & GD_FLG_SERIAL_READY)) {
 		os_puts(s);
 		return;
 	}
diff --git a/drivers/serial/serial.c b/drivers/serial/serial.c
index 803d8506d9..d2eb7520d0 100644
--- a/drivers/serial/serial.c
+++ b/drivers/serial/serial.c
@@ -418,6 +418,7 @@ static struct serial_device *get_current(void)
  */
 int serial_init(void)
 {
+	gd->flags |= GD_FLG_SERIAL_READY;
 	return get_current()->start();
 }
 
diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h
index edde9d7dd0..74df210033 100644
--- a/include/asm-generic/global_data.h
+++ b/include/asm-generic/global_data.h
@@ -106,5 +106,6 @@ typedef struct global_data {
 #define GD_FLG_LOGINIT		0x00020	/* Log Buffer has been initialized */
 #define GD_FLG_DISABLE_CONSOLE	0x00040	/* Disable console (in & out)	   */
 #define GD_FLG_ENV_READY	0x00080	/* Env. imported into hash table   */
+#define GD_FLG_SERIAL_READY	0x00100	/* Pre-reloc serial console ready  */
 
 #endif /* __ASM_GENERIC_GBL_DATA_H */