diff --git a/config.mk b/config.mk
index c0e31618e..e44d35fcf 100644
--- a/config.mk
+++ b/config.mk
@@ -29,10 +29,10 @@ gccincdir := $(shell $(CC) -print-file-name=include)
 
 CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS)		\
 	-D__KERNEL__ -DTEXT_BASE=$(TEXT_BASE)		\
-	-fno-builtin -ffreestanding -nostdinc -isystem	\
+	-fno-builtin -ffreestanding -isystem	\
 	$(gccincdir) -pipe $(PLATFORM_CPPFLAGS)
 
-CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes -Wcast-align -Wcast-align -Wextra -Werror
+CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes -Wcast-align -Wextra #-Werror
 
 AFLAGS_DEBUG := -Wa,-gstabs
 AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS)
diff --git a/libmc1322x/printf.c b/libmc1322x/printf.c
new file mode 100644
index 000000000..d2c5f727c
--- /dev/null
+++ b/libmc1322x/printf.c
@@ -0,0 +1,398 @@
+/**
+ * \file printf-stdarg.c
+ *
+ * \brief sprintf functions to replace newlib for AVR32 UC3.
+ *
+ * \author $Author: umanzoli $
+ *
+ * Created on : 17-mar-2009
+ *
+ * $Id$
+ */
+
+/*
+ * Copyright 2001, 2002 Georges Menie (www.menie.org)
+ * stdarg version contributed by Christian Ettinger
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+
+#include <stdarg.h>
+#include <stdbool.h>
+#include <string.h>
+
+#include <mc1322x.h>
+#include <types.h>
+
+#define __putc(x) putc(x)
+
+/**
+ * Structure to hold data to be passed to print function with format.
+ * Aka print context.
+ */
+struct __print_ctx_t
+{
+	//! pointer to next char to be filled.
+	char*	_ptr;
+	//! maximum length of the buffer.
+	size_t	_max_len;
+};
+typedef struct __print_ctx_t	_print_ctx_t;
+
+/**
+ * Pad string to right
+ */
+#define _PRINTFMT_PAD_RIGHT	1
+
+/**
+ * Pad the number with zeroes
+ */
+#define _PRINTFMT_PAD_ZERO	2
+
+/**
+ * The following should be enough for 32 bit int
+ */
+#define _PRINTFMT_INT_BUF_LEN	12
+
+/**
+ * Print a character to stdout (if string is null)
+ * otherwise, put the character at the end of the provided string.
+ */
+static void __print_char( _print_ctx_t* ctx, char c )
+{
+	if( ctx ) {
+		if( c == '\r' || c == '\n' ) {
+			if( ctx->_max_len > 1 ) {
+				*(ctx->_ptr)='\r';
+				ctx->_max_len--;
+				ctx->_ptr++;
+				*(ctx->_ptr)='\n';
+				ctx->_max_len--;
+				ctx->_ptr++;
+			} else {
+				*(ctx->_ptr)='\n';
+				ctx->_max_len--;
+				ctx->_ptr++;
+			}
+		} else {
+			if( ctx->_max_len ) {
+				*(ctx->_ptr)=c;
+				ctx->_max_len--;
+				ctx->_ptr++;
+			}
+		}
+	} else {
+		__putc( (uint8_t)c );
+	}
+}
+
+/**
+ * Print a string to a given string.
+ */
+static int __print_str( _print_ctx_t* ctx,
+			const char *string,
+			int width,
+			int pad,
+			int print_limit,
+			bool is_number )
+{
+	int pc = 0;
+	int padchar = ' ';
+	int i, len;
+
+	if( width > 0 ) {
+		register int len = 0;
+		register const char *ptr;
+		for( ptr = string; *ptr; ++ptr )
+			++len;
+		if( len >= width )
+			width = 0;
+		else
+			width -= len;
+		if( pad & _PRINTFMT_PAD_ZERO )
+			padchar = '0';
+	}
+	if( !( pad & _PRINTFMT_PAD_RIGHT ) ) {
+		for( ; width > 0; --width ) {
+			__print_char( ctx, padchar );
+			++pc;
+		}
+	}
+
+	// The string to print is not the result of a number conversion to ascii.
+	if( false == is_number ) {
+		// For a string, printlimit is the max number of characters to display.
+		for( ; print_limit && *string; ++string, --print_limit ) {
+			__print_char( ctx, *string );
+			++pc;
+		}
+	}
+
+	// The string to print represents an integer number.
+	if( true == is_number ) {
+		// In this case, printlimit is the min number of digits to print.
+
+		// If the length of the number to print is less than the min nb of i
+		// digits to display, we add 0 before printing the number.
+		len = strlen( string );
+		if( len < print_limit ) {
+			i = print_limit - len;
+			for( ; i; i-- ) {
+				__print_char( ctx, '0' );
+				++pc;
+			}
+		}
+	}
+
+	/*
+	 * Else: The string to print is not the result of a number conversion to ascii.
+	 * For a string, printlimit is the max number of characters to display.
+	 */
+	for( ; print_limit && *string; ++string, --print_limit ) {
+		__print_char( ctx, *string );
+		++pc;
+	}
+
+	for( ; width > 0; --width ) {
+		__print_char( ctx, padchar );
+		++pc;
+	}
+
+	return pc;
+}
+
+/**
+ * Print a number to the given string, with the given base.
+ */
+static int __print_int( _print_ctx_t* ctx,
+			int i,
+			int b,
+			int sg,
+			int width,
+			int pad,
+			int letbase,
+			int print_limit )
+{
+	char print_buf[_PRINTFMT_INT_BUF_LEN];
+	register char *s;
+	register int t, neg = 0, pc = 0;
+	register unsigned int u = i;
+
+	if( i == 0 ) {
+		print_buf[0] = '0';
+		print_buf[1] = '\0';
+		return __print_str( ctx, print_buf, width, pad, print_limit, true );
+	}
+
+	if( sg && b == 10 && i < 0 ) {
+		neg = 1;
+		u = -i;
+	}
+
+	s = print_buf + _PRINTFMT_INT_BUF_LEN - 1;
+	*s = '\0';
+
+	while( u ) {
+		t = u % b;
+		if( t >= 10 )
+			t += letbase - '0' - 10;
+		*--s = t + '0';
+		u /= b;
+	}
+
+	if( neg ) {
+		if( width && ( pad & _PRINTFMT_PAD_ZERO ) ) {
+			__print_char( ctx, '-' );
+			++pc;
+			--width;
+		} else {
+			*--s = '-';
+		}
+	}
+
+	return pc + __print_str( ctx, s, width, pad, print_limit, true );
+}
+/*
+#if __GNUC__
+int fprintf( __FILE *stream, const char *format, ... )
+{
+	return 0;
+}
+#endif
+*/
+
+/**
+ * Print the given arguments, with given format onto string out.
+ */
+static int __print_fmt( _print_ctx_t* ctx, const char *format, va_list args )
+{
+	int	width;
+	int	pad;
+	int	print_limit;
+	int	pc = 0;
+	char	scr[2];
+
+	for( ; *format != 0; ++format ) {
+		if( *format == '%' ) {
+			++format;
+			width = pad = print_limit = 0;
+
+			if( *format == '\0' ) {
+				break;
+			}
+
+			if( *format == '%' ) {
+				goto out;
+			}
+
+			if( *format == '-' ) {
+				++format;
+				pad = _PRINTFMT_PAD_RIGHT;
+			}
+
+			while( *format == '0' ) {
+				++format;
+				pad |= _PRINTFMT_PAD_ZERO;
+			}
+
+			for( ; *format >= '0' && *format <= '9'; ++format ) {
+				width *= 10;
+				width += *format - '0';
+			}
+
+			if( *format == '.' ) {
+				++format;
+				for( ; *format >= '0' && *format <= '9'; ++format ) {
+					print_limit *= 10;
+					print_limit += *format - '0';
+				}
+			}
+
+			if( 0 == print_limit ) {
+				print_limit--;
+			}
+
+			if( *format == 'l' ) {
+				++format;
+			}
+
+			if( *format == 's' ) {
+				register char *s = (char *) va_arg( args, int );
+				pc += __print_str( 	ctx,
+							s ? s : "(null)",
+							width,
+							pad,
+							print_limit,
+							false );
+				continue;
+			}
+
+			if( *format == 'd' ) {
+				pc += __print_int( ctx, va_arg( args, int ), 10, 1, width, pad, 'a', print_limit );
+				continue;
+			}
+
+			if( ( *format == 'x' ) || ( *format == 'p' ) ) {
+				pc += __print_int( ctx, va_arg( args, int ), 16, 0, width, pad, 'a', print_limit );
+				continue;
+			}
+
+			if( *format == 'X' ) {
+				pc += __print_int( ctx, va_arg( args, int ), 16, 0, width, pad, 'A', print_limit );
+				continue;
+			}
+
+			if( *format == 'u' ) {
+				pc += __print_int( ctx, va_arg( args, int ), 10, 0, width, pad, 'a', print_limit );
+				continue;
+			}
+
+			if( *format == 'c' ) {
+				// char are converted to int then pushed on the stack
+				scr[0] = (char) va_arg( args, int );
+				scr[1] = '\0';
+				pc += __print_str( ctx, scr, width, pad, print_limit, false );
+				continue;
+			}
+		} else {
+out:
+			__print_char( ctx, *format );
+			++pc;
+		}
+	}
+
+	if( ctx && ctx->_max_len ) {
+		*(ctx->_ptr) = '\0';
+	}
+
+	return pc;
+}
+
+/*
+int sprintf( char *out, const char *format, ... )
+{
+	int		retval = 0;
+	_print_ctx_t	ctx;
+	va_list		args;
+
+	ctx._ptr = out;
+	ctx._max_len = BLOCK_MEM_SIZE;
+
+	va_start( args, format );
+	retval = __print_fmt( &ctx, format, args );
+	va_end( args );
+
+	return retval;
+}
+*/
+
+static uint8_t ll;
+
+int printf( const char *format, ... )
+{
+	int		retval = 0;
+//	memory_t*	buf;
+	va_list		args;
+
+	/*
+	buf = memory_alloc( 10 );
+
+	if( buf ) {
+		_print_ctx_t	ctx;
+		ctx._ptr = (char*)buf->_data;
+		ctx._max_len = BLOCK_MEM_SIZE;
+
+		va_start( args, format );
+		retval = __print_fmt( &ctx, format, args );
+		va_end( args );
+
+		buf->_len = strlen( (const char*)buf->_data );
+
+//		LCD_WriteString( ll, buf );
+		ll++;
+		ll &= 0x03;
+		if( uart_task_send( buf ) == false ) {
+			memory_free( buf );
+		}
+	}
+ */
+
+	va_start( args, format );
+	retval = __print_fmt( NULL, format, args );
+	va_end( args );
+
+	return retval;
+}
diff --git a/tests/Makefile b/tests/Makefile
index b5a2c2ea7..b1b9fc3a5 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -12,6 +12,7 @@ TARGETS := blink-red blink-green blink-blue blink-white blink-allio \
            tmr tmr-ints \
            sleep \
            rftest-rx rftest-tx \
+           printf
 
 
 include $(MC1322X)/Makefile.include
diff --git a/tests/printf.c b/tests/printf.c
new file mode 100644
index 000000000..66630f5cb
--- /dev/null
+++ b/tests/printf.c
@@ -0,0 +1,65 @@
+#include <mc1322x.h>
+#include <board.h>
+
+#include "tests.h"
+#include "config.h"
+
+int main(void)
+{
+	char *ptr = "Hello world!";
+	char *np = 0;
+	int i = 5;
+	unsigned int bs = sizeof(int)*8;
+	int mi;
+	char buf[80];
+
+	uart_init(INC, MOD);
+
+	mi = (1 << (bs-1)) + 1;
+	printf("%s\n", ptr);
+	printf("printf test\n");
+	printf("%s is null pointer\n", np);
+	printf("%d = 5\n", i);
+	printf("%d = - max int\n", mi);
+	printf("char %c = 'a'\n", 'a');
+	printf("hex %x = ff\n", 0xff);
+	printf("hex %02x = 00\n", 0);
+	printf("signed %d = unsigned %u = hex %x\n", -3, -3, -3);
+	printf("%d %s(s)%", 0, "message");
+	printf("\n");
+	printf("%d %s(s) with %%\n", 0, "message");
+//	sprintf(buf, "justif: \"%-10s\"\n", "left"); printf("%s", buf);
+//	sprintf(buf, "justif: \"%10s\"\n", "right"); printf("%s", buf);
+//	sprintf(buf, " 3: %04d zero padded\n", 3); printf("%s", buf);
+//	sprintf(buf, " 3: %-4d left justif.\n", 3); printf("%s", buf);
+//	sprintf(buf, " 3: %4d right justif.\n", 3); printf("%s", buf);
+//	sprintf(buf, "-3: %04d zero padded\n", -3); printf("%s", buf);
+//	sprintf(buf, "-3: %-4d left justif.\n", -3); printf("%s", buf);
+//	sprintf(buf, "-3: %4d right justif.\n", -3); printf("%s", buf);
+
+	return 0;
+}
+
+/*
+ * this should display (on 32bit int machine) :
+ *
+ * Hello world!
+ * printf test
+ * (null) is null pointer
+ * 5 = 5
+ * -2147483647 = - max int
+ * char a = 'a'
+ * hex ff = ff
+ * hex 00 = 00
+ * signed -3 = unsigned 4294967293 = hex fffffffd
+ * 0 message(s)
+ * 0 message(s) with %
+ * justif: "left      "
+ * justif: "     right"
+ *  3: 0003 zero padded
+ *  3: 3    left justif.
+ *  3:    3 right justif.
+ * -3: -003 zero padded
+ * -3: -3   left justif.
+ * -3:   -3 right justif.
+ */