From 4f7c8961919bcfed90b1a9b622a31f64498a2a96 Mon Sep 17 00:00:00 2001
From: wangjianyu3 <wangjianyu3@xiaomi.com>
Date: Tue, 10 Mar 2026 12:58:24 +0800
Subject: [PATCH] system/nxinit: add CONFIG_SYSTEM_NXINIT_STDOUT for
 printf-based log output

Syslog may be output via services such as DFX. When debugging the init
component (e.g., service startup failures, including DFX-related
exceptions), syslog may not be output properly.

Add a debug Kconfig option SYSTEM_NXINIT_STDOUT that redirects all init
log macros (init_debug/info/warn/err) to printf instead of syslog.
This is useful for early boot debugging when syslog is not yet
available or serial console shows no output.

Introduce init_log_output() macro as the common log backend, selected
at compile time between printf (with appended newline) and syslog.

Signed-off-by: wangjianyu3 <wangjianyu3@xiaomi.com>
---
 system/nxinit/Kconfig |  8 ++++++++
 system/nxinit/init.h  | 15 +++++++++++----
 2 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/system/nxinit/Kconfig b/system/nxinit/Kconfig
index 251ccae9bfa..a1f97561c36 100644
--- a/system/nxinit/Kconfig
+++ b/system/nxinit/Kconfig
@@ -168,4 +168,12 @@ config SYSTEM_NXINIT_DEBUG
 	bool "Enable debug log"
 	depends on SYSTEM_NXINIT_INFO
 
+config SYSTEM_NXINIT_STDOUT
+	bool "Output log to stdout (printf)"
+	default n
+	---help---
+		Debug option: redirect all init logs to stdout via printf
+		instead of syslog. Useful when syslog is not available or
+		serial console has no output during early boot.
+
 endif
diff --git a/system/nxinit/init.h b/system/nxinit/init.h
index e6ce868fbae..755363aeaef 100644
--- a/system/nxinit/init.h
+++ b/system/nxinit/init.h
@@ -28,6 +28,7 @@
  ****************************************************************************/
 
 #include <poll.h>
+#include <stdio.h>
 #include <syslog.h>
 
 /****************************************************************************
@@ -36,8 +37,14 @@
 
 #define TIMESPEC2MS(t) (((t).tv_sec * 1000) + (t).tv_nsec / 1000000)
 
+#ifdef CONFIG_SYSTEM_NXINIT_STDOUT
+#define init_log_output(level, fmt, ...) printf(fmt "\n", ##__VA_ARGS__)
+#else
+#define init_log_output(level, ...) syslog(level, ##__VA_ARGS__)
+#endif
+
 #ifdef CONFIG_SYSTEM_NXINIT_DEBUG
-#define init_debug(...) syslog(LOG_USER, ##__VA_ARGS__)
+#define init_debug(...) init_log_output(LOG_USER, ##__VA_ARGS__)
 #define init_dump_args(argc, argv) \
           { \
             int _i; \
@@ -52,19 +59,19 @@
 #endif
 
 #ifdef CONFIG_SYSTEM_NXINIT_INFO
-#define init_info(...) syslog(LOG_INFO, ##__VA_ARGS__)
+#define init_info(...) init_log_output(LOG_INFO, ##__VA_ARGS__)
 #else
 #define init_info(...)
 #endif
 
 #ifdef CONFIG_SYSTEM_NXINIT_WARN
-#define init_warn(...) syslog(LOG_WARNING, ##__VA_ARGS__)
+#define init_warn(...) init_log_output(LOG_WARNING, ##__VA_ARGS__)
 #else
 #define init_warn(...)
 #endif
 
 #ifdef CONFIG_SYSTEM_NXINIT_ERR
-#define init_err(f, ...) syslog(LOG_ERR, "Error " f, ##__VA_ARGS__)
+#define init_err(f, ...) init_log_output(LOG_ERR, "Error " f, ##__VA_ARGS__)
 #else
 #define init_err(...)
 #endif