diff --git a/BaS_gcc/Makefile b/BaS_gcc/Makefile
index a8518e7..6702a56 100644
--- a/BaS_gcc/Makefile
+++ b/BaS_gcc/Makefile
@@ -35,9 +35,8 @@ CFLAGS=-mcpu=5474\
 	   -g\
 	   -Wno-multichar\
 	   -Winline\
-	   -O \
+	   -Os \
 	   -fomit-frame-pointer\
-	   -fno-strict-aliasing\
 	   -ffreestanding\
 	   -fleading-underscore\
 	   -Wa,--register-prefix-optional
diff --git a/BaS_gcc/sources/BaS.c b/BaS_gcc/sources/BaS.c
index bf153c7..b75e3eb 100644
--- a/BaS_gcc/sources/BaS.c
+++ b/BaS_gcc/sources/BaS.c
@@ -250,6 +250,9 @@ void BaS(void)
 		*adr++ = 0x0L;
 	}
 
+	/* set Falcon bus control register */
+	/* sets bit 3 and 6. Both are undefined on an original Falcon? */
+
 	* (volatile uint8_t *) 0xffff8007 = 0x48;	/* FIXME: what's that ? */
 
 	/* ST RAM */