diff --git a/sys/arm/allwinner/clkng/aw_clk_nm.c b/sys/arm/allwinner/clkng/aw_clk_nm.c
index 27caf3374266..f530acf65a7a 100644
--- a/sys/arm/allwinner/clkng/aw_clk_nm.c
+++ b/sys/arm/allwinner/clkng/aw_clk_nm.c
@@ -221,11 +221,15 @@ aw_clk_nm_set_freq(struct clknode *clk, uint64_t fparent, uint64_t *fout,
 	if ((best < *fout) &&
 	  ((flags & CLK_SET_ROUND_DOWN) == 0)) {
 		*stop = 1;
+		printf("best freq (%llu) < requested freq(%llu)\n",
+		    best, *fout);
 		return (ERANGE);
 	}
 	if ((best > *fout) &&
 	  ((flags & CLK_SET_ROUND_UP) == 0)) {
 		*stop = 1;
+		printf("best freq (%llu) > requested freq(%llu)\n",
+		    best, *fout);
 		return (ERANGE);
 	}