arch/arm/src/lpc17xx_40xx/Kconfig: Add missing LPC17_40_PHY_CEMENT_DISABLE config to the lpc17xx Kconfig file. For some reason this config wasn't referenced anywhere else except in arch/arm/src/lpc17xx_40xx/lpc17_40_ethernet.c.

arch/arm/src/lpc17xx_40xx/Kconfig

@@ -734,6 +734,11 @@ config LPC17_40_PHY_AUTONEG
 	---help---
 		Enable auto-negotiation
 
+config LPC17_40_PHY_CEMENT_DISABLE
+	bool "Don't re-write the PHY mode"
+	---help---
+		Re-writing the PHY mode might cause problems with some PHYs.
+
 config LPC17_40_PHY_SPEED100
 	bool "100Mbit/Sec"
 	depends on !LPC17_40_PHY_AUTONEG

arch/arm/src/lpc17xx_40xx/lpc17_40_ethernet.c

@@ -2869,13 +2869,13 @@ static inline int lpc17_40_phyinit(struct lpc17_40_driver_s *priv)
   /* Disable auto-configuration.  Set the fixed speed/duplex mode.
    * (probably more than little redundant).
    *
-   * REVISIT: Revisit the following CONFIG_PHY_CEMENT_DISABLE work-around.
+   * REVISIT: Revisit the following CONFIG_LPC17_40_PHY_CEMENT_DISABLE work-around.
    * It is should not needed if CONFIG_LPC17_40_PHY_AUTONEG is defined and is known
    * cause a problem for at least one PHY (DP83848I PHY).  It might be
    * safe just to remove this elided coded for all PHYs.
    */
 
-#ifndef CONFIG_PHY_CEMENT_DISABLE
+#ifndef CONFIG_LPC17_40_PHY_CEMENT_DISABLE
   ret = lpc17_40_phymode(phyaddr, priv->lp_mode);
 #endif
   lpc17_40_showmii(phyaddr, "After final configuration");