diff --git a/arch/platform/jn516x/lib/sprintf.c b/arch/platform/jn516x/lib/sprintf.c
deleted file mode 100644
index dd2408090..000000000
--- a/arch/platform/jn516x/lib/sprintf.c
+++ /dev/null
@@ -1,237 +0,0 @@
-/*
-   File: printf.c
-
-   Copyright (c) 2004,2008 Kustaa Nyholm / SpareTimeLabs
-
-   All rights reserved.
-
-   Redistribution and use in source and binary forms, with or without modification,
-   are permitted provided that the following conditions are met:
-
-   Redistributions of source code must retain the above copyright notice, this list
-   of conditions and the following disclaimer.
-
-   Redistributions in binary form must reproduce the above copyright notice, this
-   list of conditions and the following disclaimer in the documentation and/or other
-   materials provided with the distribution.
-
-   Neither the name of the Kustaa Nyholm or SpareTimeLabs nor the names of its
-   contributors may be used to endorse or promote products derived from this software
-   without specific prior written permission.
-
-   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
-   IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
-   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
-   NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
-   OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
-   OF SUCH DAMAGE.
-
- */
-
-/*
- * This is BSD code obtained from http://www.sparetimelabs.com/printfrevisited/index.html
- * From the web page:
- * "The code is GPL and BSD lincensed, download the BSD licensed version from the link
- * above or use the GPL licensed code from this page below."
- *
- * modified by Beshr Al Nahas <beshr@sics.se> and Simon Duquennoy <simonduq@sics.se>
- */
-
-#include "contiki.h"
-#include <stdarg.h>
-#include <ctype.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-#include "dev/uart0.h"
-
-static char *bf, buf[14], uc, zs;
-static unsigned int num;
-
-static void
-out(char c)
-{
-  *bf++ = c;
-}
-static void
-outDgt(char dgt)
-{
-  out(dgt + (dgt < 10 ? '0' : (uc ? 'A' : 'a') - 10));
-  zs = 1;
-}
-static void
-divOut(unsigned int div)
-{
-  unsigned char dgt = 0;
-  while(num >= div) {
-    num -= div;
-    dgt++;
-  }
-  if(zs || dgt > 0) {
-    outDgt(dgt);
-  }
-}
-int
-vsnprintf(char *str, size_t n, const char *fmt, __VALIST va)
-{
-  char ch, *p, *str_orig = str;
-  char next_ch;
-
-  while((ch = *fmt++) && str - str_orig < n) {
-    if(ch != '%') {
-      *str++ = ch;
-    } else {
-      char lz = 0;
-      char w = 0;
-      ch = *(fmt++);
-      if(ch == '0') {
-        ch = *(fmt++);
-        lz = 1;
-      }
-      if(ch == '-' || (ch >= '0' && ch <= '9')) {
-        w = 0;
-        while(ch == '-' || (ch >= '0' && ch <= '9')) {
-          if(ch != '-') {
-            w = (((w << 2) + w) << 1) + ch - '0';
-          }
-          ch = *fmt++;
-        }
-      }
-      bf = buf;
-      p = bf;
-      zs = 0;
-start_format:
-      next_ch = *fmt;
-      switch(ch) {
-      case 0:
-        goto abort;
-      case 'l':
-        if(next_ch == 'x'
-           || next_ch == 'X'
-           || next_ch == 'u'
-           || next_ch == 'd') {
-          ch = *(fmt++);
-          goto start_format;
-        }
-      case 'u':
-      case 'd':
-        num = va_arg(va, unsigned int);
-        if(ch == 'd' && (int)num < 0) {
-          num = -(int)num;
-          out('-');
-        }
-        divOut(1000000000);
-        divOut(100000000);
-        divOut(10000000);
-        divOut(1000000);
-        divOut(100000);
-        divOut(10000);
-        divOut(1000);
-        divOut(100);
-        divOut(10);
-        outDgt(num);
-        break;
-      case 'p':
-      case 'x':
-      case 'X':
-        uc = ch == 'X';
-        num = va_arg(va, unsigned int);
-        /* divOut(0x100000000UL); */
-        divOut(0x10000000);
-        divOut(0x1000000);
-        divOut(0x100000);
-        divOut(0x10000);
-        divOut(0x1000);
-        divOut(0x100);
-        divOut(0x10);
-        outDgt(num);
-        break;
-      case 'c':
-        out((char)(va_arg(va, int)));
-        break;
-      case 's':
-        p = va_arg(va, char *);
-        break;
-      case '%':
-        out('%');
-      default:
-        break;
-      }
-      *bf = 0;
-      bf = p;
-
-      while(*bf++ && w > 0) {
-        w--;
-      }
-      while(w-- > 0) {
-        if(str - str_orig < n) {
-          *str++ = lz ? '0' : ' ';
-        } else {
-          goto abort;
-        }
-      }
-      while((ch = *p++)) {
-        if(str - str_orig < n) {
-          *str++ = ch;
-        } else {
-          goto abort;
-        }
-      }
-    }
-  }
-
-abort:
-  if(str - str_orig < n) {
-    *str = '\0';
-  } else {
-    *(--str) = '\0';
-  } return str - str_orig;
-}
-int
-sprintf(char *str, const char *fmt, ...)
-{
-  int m;
-  __VALIST va;
-  va_start(va, fmt);
-  m = vsnprintf(str, 0xffffffff, fmt, va);
-  va_end(va);
-  return m;
-}
-int
-snprintf(char *str, size_t n, const char *fmt, ...)
-{
-  int m;
-  __VALIST va;
-  va_start(va, fmt);
-  m = vsnprintf(str, n, fmt, va);
-  va_end(va);
-  return m;
-}
-int
-printf(const char *fmt, ...)
-{
-  int m, i;
-  char str[256];
-  __VALIST va;
-  va_start(va, fmt);
-  m = vsnprintf(str, sizeof(str), fmt, va);
-  va_end(va);
-  for(i = 0; i < m; i++) {
-    putchar(str[i]);
-  }
-  return m;
-}
-int
-puts(const char *s)
-{
-  char c;
-  while((c = *s++) != '\0') {
-    putchar(c);
-  }
-  putchar('\n');
-  return strlen(s);
-}