[PATCH 2/3] log: use debug uart to output trace before LOG init

[Patrick Delaunay]

Use the debug uart functions to output the traces before
the log initialization (when CONFIG_LOG is not activated)
as it is done in puts/putc function in console.c.

This patch allows to display the first U-Boot traces
(with macro debug) when CONFIG_DEBUG_UART is activated
and not only drop them.

For example for traces in board_f.c requested by the macro debug,
when LOG_DEBUG is defined and CONFIG_LOG is activated.

Signed-off-by: Patrick Delaunay <patrick.delaunay at st.com>
---

 common/log.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/common/log.c b/common/log.c
index aadf533fb2..aa5505943f 100644
--- a/common/log.c
+++ b/common/log.c
@@ -7,6 +7,7 @@
  */
 
 #include <common.h>
+#include <debug_uart.h>
 #include <log.h>
 #include <malloc.h>
 #include <dm/uclass.h>
@@ -245,6 +246,16 @@ int _log(enum log_category_t cat, enum log_level_t level, const char *file,
 
 	if (!(gd->flags & GD_FLG_LOG_READY)) {
 		gd->log_drop_count++;
+
+		/* manage droppped trace at default level with debug uart */
+		if (IS_ENABLED(CONFIG_DEBUG_UART) &&
+		    (rec.level <= CONFIG_LOG_DEFAULT_LEVEL || rec.force_debug)) {
+			va_start(args, fmt);
+			vsnprintf(buf, sizeof(buf), fmt, args);
+			printascii(buf);
+			va_end(args);
+		}
+
 		return -ENOSYS;
 	}
 	va_start(args, fmt);
-- 
2.17.1