diff --git a/arch/arm/src/stm32f7/chip/stm32_ethernet.h b/arch/arm/src/stm32f7/chip/stm32_ethernet.h
index 1d648fe0087..e5fc6982d28 100644
--- a/arch/arm/src/stm32f7/chip/stm32_ethernet.h
+++ b/arch/arm/src/stm32f7/chip/stm32_ethernet.h
@@ -245,11 +245,11 @@
 #define ETH_MACMIIAR_MW              (1 << 1)  /* Bit 1: MII write */
 #define ETH_MACMIIAR_CR_SHIFT        (2)       /* Bits 2-4: Clock range */
 #define ETH_MACMIIAR_CR_MASK         (7 << ETH_MACMIIAR_CR_SHIFT)
-#  define ETH_MACMIIAR_CR_60_100     (0 << ETH_MACMIIAR_CR_SHIFT) /* 000 60-100  MHz HCLK/42 */
-#  define ETH_MACMIIAR_CR_100_150    (1 << ETH_MACMIIAR_CR_SHIFT) /* 001 100-150 MHz HCLK/62 */
-#  define ETH_MACMIIAR_CR_20_35      (2 << ETH_MACMIIAR_CR_SHIFT) /* 010 20-35   MHz HCLK/16 */
-#  define ETH_MACMIIAR_CR_35_60      (3 << ETH_MACMIIAR_CR_SHIFT) /* 011 35-60   MHz HCLK/26 */
-#  define ETH_MACMIIAR_CR_150_180    (4 << ETH_MACMIIAR_CR_SHIFT) /* 100 150-180 MHz HCLK/102 */
+#  define ETH_MACMIIAR_CR_DIV42      (0 << ETH_MACMIIAR_CR_SHIFT) /* 60-100  MHz HCLK/42 */
+#  define ETH_MACMIIAR_CR_DIV62      (1 << ETH_MACMIIAR_CR_SHIFT) /* 100-150 MHz HCLK/62 */
+#  define ETH_MACMIIAR_CR_DIV16      (2 << ETH_MACMIIAR_CR_SHIFT) /* 20-35   MHz HCLK/16 */
+#  define ETH_MACMIIAR_CR_DIV26      (3 << ETH_MACMIIAR_CR_SHIFT) /* 35-60   MHz HCLK/26 */
+#  define ETH_MACMIIAR_CR_DIV102     (4 << ETH_MACMIIAR_CR_SHIFT) /* 150-216 MHz HCLK/102 */
 #define ETH_MACMIIAR_MR_SHIFT        (6)       /* Bits 6-10: MII register */
 #define ETH_MACMIIAR_MR_MASK         (31 << ETH_MACMIIAR_MR_SHIFT)
 #  define ETH_MACMIIAR_MR(n)         ((uint32_t)(n) << ETH_MACMIIAR_MR_SHIFT)
diff --git a/arch/arm/src/stm32f7/stm32_ethernet.c b/arch/arm/src/stm32f7/stm32_ethernet.c
index e301db61e67..6871ba91f78 100644
--- a/arch/arm/src/stm32f7/stm32_ethernet.c
+++ b/arch/arm/src/stm32f7/stm32_ethernet.c
@@ -235,17 +235,15 @@
 /* Set MACMIIAR CR bits depending on HCLK setting */
 
 #if STM32_HCLK_FREQUENCY >= 20000000 && STM32_HCLK_FREQUENCY < 35000000
-#  define ETH_MACMIIAR_CR ETH_MACMIIAR_CR_20_35
+#  define ETH_MACMIIAR_CR ETH_MACMIIAR_CR_DIV16
 #elif STM32_HCLK_FREQUENCY >= 35000000 && STM32_HCLK_FREQUENCY < 60000000
-#  define ETH_MACMIIAR_CR ETH_MACMIIAR_CR_35_60
+#  define ETH_MACMIIAR_CR ETH_MACMIIAR_CR_DIV26
 #elif STM32_HCLK_FREQUENCY >= 60000000 && STM32_HCLK_FREQUENCY < 100000000
-#  define ETH_MACMIIAR_CR ETH_MACMIIAR_CR_60_100
+#  define ETH_MACMIIAR_CR ETH_MACMIIAR_CR_DIV42
 #elif STM32_HCLK_FREQUENCY >= 100000000 && STM32_HCLK_FREQUENCY < 150000000
-#  define ETH_MACMIIAR_CR ETH_MACMIIAR_CR_100_150
-#elif STM32_HCLK_FREQUENCY >= 150000000 && STM32_HCLK_FREQUENCY <= 180000000
-#  define ETH_MACMIIAR_CR ETH_MACMIIAR_CR_150_180
-#else
-#  error "STM32_HCLK_FREQUENCY not supportable"
+#  define ETH_MACMIIAR_CR ETH_MACMIIAR_CR_DIV62
+#else /* if STM32_HCLK_FREQUENCY >= 150000000 && STM32_HCLK_FREQUENCY <= 216000000 */
+#  define ETH_MACMIIAR_CR ETH_MACMIIAR_CR_DIV102
 #endif
 
 /* Timing *******************************************************************/
diff --git a/libc/netdb/lib_gethostbynamer.c b/libc/netdb/lib_gethostbynamer.c
index b23a5a95050..3b9996f7c6c 100644
--- a/libc/netdb/lib_gethostbynamer.c
+++ b/libc/netdb/lib_gethostbynamer.c
@@ -327,6 +327,7 @@ static int lib_find_answer(FAR const char *name, FAR struct hostent *host,
  *
  ****************************************************************************/
 
+#ifdef CONFIG_NETDB_DNSCLIENT
 static int lib_dns_query(FAR const char *hostname,
                          FAR struct sockaddr *addr, socklen_t *addrlen)
 {
@@ -350,6 +351,7 @@ static int lib_dns_query(FAR const char *hostname,
   close(sd);
   return ret;
 }
+#endif /* CONFIG_NETDB_DNSCLIENT */
 
 /****************************************************************************
  * Name: lib_dns_lookup