diff --git a/Makefile b/Makefile
index 63cad7a27e..93fd4cbf63 100644
--- a/Makefile
+++ b/Makefile
@@ -48,7 +48,8 @@ CFLAGS     := -Os -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 	      -ffreestanding -fno-builtin
 
 HOSTCC     := gcc
-HOSTCFLAGS := -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer 
+HOSTCFLAGS := -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer \
+	      -Wno-unused -Wno-sign-compare -Wno-pointer-sign
 
 LINUXBIOSINCLUDE    :=  -I$(src) -Iinclude \
 			-I$(src)/include \
diff --git a/util/dtc/Makefile b/util/dtc/Makefile
index 34dfb3fe46..dcddf4cd47 100644
--- a/util/dtc/Makefile
+++ b/util/dtc/Makefile
@@ -28,9 +28,9 @@ $(obj)/lex.yy.c: $(src)/util/dtc/dtc-lexer.l
 $(obj)/dtc.o: $(src)/util/dtc/dtc.c
 	$(Q)$(HOSTCC) $(HOSTCFLAGS) -o $@ -c $< 
 $(obj)/livetree.o: $(src)/util/dtc/livetree.c
-	$(Q)$(HOSTCC) $(HOSTCFLAGS) -o $@ -c $< 
+	$(HOSTCC) $(HOSTCFLAGS) -o $@ -c $< 
 $(obj)/flattree.o: $(src)/util/dtc/flattree.c
-	$(Q)$(HOSTCC) $(HOSTCFLAGS) -o $@ -c $< 
+	$(HOSTCC) $(HOSTCFLAGS) -o $@ -c $< 
 $(obj)/data.o: $(src)/util/dtc/data.c
 	$(Q)$(HOSTCC) $(HOSTCFLAGS) -o $@ -c $< 
 $(obj)/treesource.o: $(src)/util/dtc/treesource.c
diff --git a/util/dtc/data.c b/util/dtc/data.c
index d3b55f9ffe..1389710aea 100644
--- a/util/dtc/data.c
+++ b/util/dtc/data.c
@@ -128,7 +128,7 @@ struct data data_copy_escape_string(char *s, int len)
 {
 	int i = 0;
 	struct data d;
-	char *q;
+	unsigned char *q;
 
 	d = data_grow_for(empty_data, strlen(s)+1);
 
diff --git a/util/dtc/dtc-lexer.l b/util/dtc/dtc-lexer.l
index 0778af0c88..239e4ccafb 100644
--- a/util/dtc/dtc-lexer.l
+++ b/util/dtc/dtc-lexer.l
@@ -84,7 +84,7 @@ char *code = 0;
 
 <MEMRESERVE>[0-9a-fA-F]+ {
 			yylloc.first_line = yylineno;
-			if (yyleng > 2*sizeof(yylval.addr)) {
+			if ((unsigned long)yyleng > 2*sizeof(yylval.addr)) {
 				fprintf(stderr, "Address value %s too large\n",
 					yytext);
 			}
@@ -103,7 +103,7 @@ char *code = 0;
 
 <CELLDATA>[0-9a-fA-F]+	{
 			yylloc.first_line = yylineno;
-			if (yyleng > 2*sizeof(yylval.cval)) {
+			if ((unsigned long)yyleng > 2*sizeof(yylval.cval)) {
 				fprintf(stderr,
 					"Cell value %s too long\n", yytext);
 			}
diff --git a/util/dtc/dtc.c b/util/dtc/dtc.c
index d11282a3c9..ec172064d4 100644
--- a/util/dtc/dtc.c
+++ b/util/dtc/dtc.c
@@ -105,12 +105,12 @@ static void usage(void)
 
 int main(int argc, char *argv[])
 {
-	struct boot_info *bi;
+	struct boot_info *bi=NULL;
 	char *inform = "dts";
 	char *outform = "dts";
 	char *outname = "-";
 	int force = 0;
-	char *arg;
+	char *arg=NULL;
 	int opt;
 	FILE *inf = NULL;
 	FILE *outf = NULL;
diff --git a/util/dtc/flattree.c b/util/dtc/flattree.c
index 2174b85223..7bcce8dbac 100644
--- a/util/dtc/flattree.c
+++ b/util/dtc/flattree.c
@@ -465,6 +465,7 @@ static void linuxbios_emit_endnode(void *e, char *label)
 	}
 }
 
+#ifdef LINUXBIOS_OUTPUT
 static void linuxbios_emit_struct_start(void *e, char *prefix, char *label)
 {
 	FILE *f = e;
@@ -482,7 +483,7 @@ static void linuxbios_emit_struct_end(void *e, char *prefix, char *label)
 		fprintf(f, "}; /*%s*/\n", label);
 	}
 }
-
+#endif
 
 
 static void linuxbios_emit_property(void *e, char *label)
@@ -1293,7 +1294,7 @@ static const char UNITCHAR[] = "0123456789abcdef,";
 static int check_node_name(char *name)
 {
 	char *atpos;
-	int basenamelen;
+	unsigned int basenamelen;
 
 	atpos = strrchr(name, '@');
 
@@ -1374,7 +1375,7 @@ static struct node *unflatten_tree(struct inbuf *dtbuf,
 
 struct boot_info *dt_from_blob(FILE *f)
 {
-	u32 magic, totalsize, version, size_str;
+	u32 magic, totalsize, version, size_str = 0;
 	u32 off_dt, off_str, off_mem_rsvmap;
 	int rc;
 	char *blob;
diff --git a/util/dtc/treesource.c b/util/dtc/treesource.c
index e9bbaa51bb..5b464c6008 100644
--- a/util/dtc/treesource.c
+++ b/util/dtc/treesource.c
@@ -57,7 +57,7 @@ enum proptype {
 static enum proptype guess_type(struct property *prop)
 {
 	int len = prop->val.len;
-	char *p = prop->val.val;
+	unsigned char *p = prop->val.val;
 	int nnoprint = 0;
 	int i;
 
@@ -92,7 +92,7 @@ static void write_tree_source_node(FILE *f, struct node *tree, int level)
 
 	for_each_property(tree, prop) {
 		cell_t *cp;
-		char *bp;
+		unsigned char *bp;
 		void *propend;
 		enum proptype type;
 
diff --git a/util/lar/Makefile b/util/lar/Makefile
index fba1c9da15..d65fc92d2c 100644
--- a/util/lar/Makefile
+++ b/util/lar/Makefile
@@ -20,10 +20,6 @@
 
 SOURCE := lar.c create.c extract.c list.c lib.c
 
-
-HOSTCC=gcc
-HOSTCFLAGS=-O2 -Wall -W
-
 $(obj)/util/lar/lar: $(patsubst %,$(src)/util/lar/%,$(SOURCE))
 	$(Q)printf "Building LAR utility..."
 	$(Q)mkdir -p $(obj)/util/lar