diff --git a/configs/sama5d4-ek/src/Makefile b/configs/sama5d4-ek/src/Makefile
index 484fab0b05..39779fea2a 100644
--- a/configs/sama5d4-ek/src/Makefile
+++ b/configs/sama5d4-ek/src/Makefile
@@ -112,10 +112,6 @@ ifeq ($(CONFIG_PWM),y)
 CSRCS += sam_pwm.c
 endif
 
-ifeq ($(CONFIG_CAN),y)
-CSRCS += sam_can.c
-endif
-
 ifeq ($(CONFIG_USBMSC),y)
 CSRCS += sam_usbmsc.c
 endif
diff --git a/configs/sama5d4-ek/src/sam_maxtouch.c b/configs/sama5d4-ek/src/sam_maxtouch.c
index e1bdaa509f..6a73fb4cec 100644
--- a/configs/sama5d4-ek/src/sam_maxtouch.c
+++ b/configs/sama5d4-ek/src/sam_maxtouch.c
@@ -120,9 +120,7 @@ static void mxt_clear(FAR const struct mxt_lower_s *lower);
  * of the maXTouch and provides some board-specific hooks.
  *
  * Memory for this structure is provided by the caller.  It is not copied
- * by the driver and is presumed to persist while the driver is active. The
- * memory must be writable because, under certain circumstances, the driver
- * may modify certain values.
+ * by the driver and is presumed to persist while the driver is active.
  */
 
 static struct sama5d4ek_tscinfo_s g_mxtinfo =
diff --git a/configs/sama5d4-ek/src/sama5d4-ek.h b/configs/sama5d4-ek/src/sama5d4-ek.h
index e0506eea46..1cddca30a5 100644
--- a/configs/sama5d4-ek/src/sama5d4-ek.h
+++ b/configs/sama5d4-ek/src/sama5d4-ek.h
@@ -394,6 +394,11 @@
                       PIO_INT_BOTHEDGES | PIO_PORT_PIOE | PIO_PIN25)
 #define IRQ_CHG_QT    SAM_IRQ_PE25
 
+/* The touchscreen communicates on TWI0, I2C address 0x4c */
+
+#define MXT_TWI_BUS      0
+#define MXT_I2C_ADDRESS  0x4c
+
 /* HSMCI Card Slots *****************************************************************/
 /* The SAMA4D4-EK provides a two SD memory card slots:  (1) a full size SD
  * card slot (J10), and (2) a microSD memory card slot (J11).
@@ -633,6 +638,12 @@
                         PIO_PORT_PIOC | PIO_PIN3)
 #define AT25_PORT      SPI0_CS0
 
+/* ACT8865 power management chip ****************************************************/
+/* The PMIC communicates on TWI0, I2C address 0x5b */
+
+#define PMIC_TWI_BUS     0
+#define PMIC_I2C_ADDRESS 0x5b
+
 /************************************************************************************
  * Public Types
  ************************************************************************************/