diff --git a/include/bas_string.h b/include/bas_string.h
index da02ffa..1359ff8 100644
--- a/include/bas_string.h
+++ b/include/bas_string.h
@@ -18,6 +18,7 @@ extern char *strcat(char *dst, const char *src);
 extern char *strncat(char *dst, const char *src, int max);
 extern int atoi(const char *c);
 extern void *memcpy(void *dst, const void *src, size_t n);
+extern void bzero(void *s, size_t n);
 
 #define isdigit(c)	(((c) >= '0') && ((c) <= '9'))
 #define isupper(c)	((c) >= 'A' && ((c) <= 'Z'))
diff --git a/sources/bas_string.c b/sources/bas_string.c
index b520dc9..3b02381 100644
--- a/sources/bas_string.c
+++ b/sources/bas_string.c
@@ -19,6 +19,15 @@ void *memcpy(void *dst, const void *src, size_t n)
 	return dst;
 }
 
+void bzero(void *s, size_t n)
+{
+	size_t i;
+
+	for (i = 0; i < n; i++)
+		((unsigned char *) s)[i] = '\0';
+}
+
+
 int strncmp(const char *s1, const char *s2, int max)
 {
 	int i;
diff --git a/sources/dma.c b/sources/dma.c
index f597696..4dcbb02 100644
--- a/sources/dma.c
+++ b/sources/dma.c
@@ -40,38 +40,22 @@ void *dma_memcpy(void *dst, void *src, size_t n)
 	start = MCF_SLT0_SCNT;
 	/* first check if we can do a "traditional" memcpy() to the destination and measure speed */
 
-	// memcpy(d, s, n);
+	memcpy(d, s, n);
 
-	{
-		uint32_t *dl = (uint32_t *) dst;
-		uint32_t *sl = (uint32_t *) src;
-		do
-		{
-			*dl++ = *sl++;
-		} while (dl < (uint32_t *) (dst + n));
-	}
 	end = MCF_SLT0_SCNT;
 
 	time = (start - end) / 132;
 	xprintf("memcpy() took %d ms (%d.%d Mbytes/second)\r\n",
 			time, n / time / 1000, n / time % 1000);
 	flush_and_invalidate_caches();
-	//#endif
+//#endif
 
+	xprintf("clear target area after memcpy():");
+	bzero(dst, n);
 	flush_and_invalidate_caches();
-
-	{
-		uint32_t *dl = (uint32_t *) dst;
-
-		xprintf("clear target area after memcpy():");
-		do
-		{
-			*dl++ = 0;
-		} while (dl < (uint32_t *) (dst + n));
-		xprintf(" finished, flush caches: ");
-		flush_and_invalidate_caches();
-		xprintf("finished\r\n");
-	}
+	xprintf(" finished, flush caches: ");
+	flush_and_invalidate_caches();
+	xprintf("finished\r\n");
 
 	start = MCF_SLT0_SCNT;
 	ret = MCD_startDma(0, src, 4, dst, 4, n, 4, DMA_ALWAYS, 7, MCD_SINGLE_DMA|MCD_TT_FLAGS_CW|MCD_TT_FLAGS_RL|MCD_TT_FLAGS_SP, 0);
diff --git a/sources/fault_vectors.c b/sources/fault_vectors.c
index 06891c6..7b199f1 100644
--- a/sources/fault_vectors.c
+++ b/sources/fault_vectors.c
@@ -24,6 +24,9 @@ void fault_handler(uint32_t pc, uint32_t format_status)
 	xprintf("format_status: %lx\r\n", format_status);
 	xprintf("pc: %lx\r\n", pc);
 
+	/*
+	 * extract info from format-/status word
+	 */
 	format = 	    (format_status & 0b11110000000000000000000000000000) >> 28;
 	fault_status = ((format_status & 0b00001100000000000000000000000000) >> 26) |
 			       ((format_status & 0b00000000000000110000000000000000) >> 16);