diff --git a/src/console/vsprintf.c b/src/console/vsprintf.c
index 4edb3ea6e6..7071611ef9 100644
--- a/src/console/vsprintf.c
+++ b/src/console/vsprintf.c
@@ -34,7 +34,7 @@ static void str_tx_byte(unsigned char byte, void *data)
 	}
 }
 
-static int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
+int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
 {
 	int i;
 	struct vsnprintf_context ctx;
diff --git a/src/include/string.h b/src/include/string.h
index d2d7bb8781..fc96393c48 100644
--- a/src/include/string.h
+++ b/src/include/string.h
@@ -4,6 +4,10 @@
 #include <stddef.h>
 #include <stdlib.h>
 
+#if !defined(__ROMCC__)
+#include <console/vtxprintf.h>
+#endif
+
 /* Stringify a token */
 #ifndef STRINGIFY
 #define _STRINGIFY(x)	#x
@@ -17,6 +21,7 @@ int memcmp(const void *s1, const void *s2, size_t n);
 void *memchr(const void *s, int c, size_t n);
 #if !defined(__ROMCC__)
 int snprintf(char *buf, size_t size, const char *fmt, ...);
+int vsnprintf(char *buf, size_t size, const char *fmt, va_list args);
 #endif
 
 // simple string functions
diff --git a/src/southbridge/amd/cimx/sb800/AmdSbLib.h b/src/southbridge/amd/cimx/sb800/AmdSbLib.h
index cc75353f3d..c13eda4e58 100644
--- a/src/southbridge/amd/cimx/sb800/AmdSbLib.h
+++ b/src/southbridge/amd/cimx/sb800/AmdSbLib.h
@@ -20,18 +20,7 @@
 #ifndef _AMD_SB_LIB_H_
 #define _AMD_SB_LIB_H_
 
-typedef signed char  *va_list;
-#ifndef _INTSIZEOF
-  #define _INTSIZEOF (n) ( (sizeof(n) + sizeof(UINTN) - 1) & ~(sizeof(UINTN) - 1) )
-#endif
-
-// Also support coding convention rules for var arg macros
-#ifndef va_start
-  #define va_start(ap, v)  ( ap = (va_list)&(v) + _INTSIZEOF (v) )
-#endif
-#define va_arg(ap, t)    ( *(t *) ((ap += _INTSIZEOF (t)) - _INTSIZEOF (t)) )
-#define va_end(ap)      ( ap = (va_list)0 )
-
+#include <console/vtxprintf.h>
 
 #pragma pack (push, 1)
 
diff --git a/src/southbridge/amd/cimx/sb900/AmdSbLib.h b/src/southbridge/amd/cimx/sb900/AmdSbLib.h
index cc75353f3d..c13eda4e58 100644
--- a/src/southbridge/amd/cimx/sb900/AmdSbLib.h
+++ b/src/southbridge/amd/cimx/sb900/AmdSbLib.h
@@ -20,18 +20,7 @@
 #ifndef _AMD_SB_LIB_H_
 #define _AMD_SB_LIB_H_
 
-typedef signed char  *va_list;
-#ifndef _INTSIZEOF
-  #define _INTSIZEOF (n) ( (sizeof(n) + sizeof(UINTN) - 1) & ~(sizeof(UINTN) - 1) )
-#endif
-
-// Also support coding convention rules for var arg macros
-#ifndef va_start
-  #define va_start(ap, v)  ( ap = (va_list)&(v) + _INTSIZEOF (v) )
-#endif
-#define va_arg(ap, t)    ( *(t *) ((ap += _INTSIZEOF (t)) - _INTSIZEOF (t)) )
-#define va_end(ap)      ( ap = (va_list)0 )
-
+#include <console/vtxprintf.h>
 
 #pragma pack (push, 1)