boards/derfmega256: define EUI-64 provider

boards/derfmega256/Makefile.dep

@@ -1 +1,5 @@
 USEMODULE += boards_common_atmega
+
+ifneq (,$(filter eui_provider,$(USEMODULE)))
+  FEATURES_REQUIRED += periph_eeprom
+endif

boards/derfmega256/include/board.h

@@ -21,10 +21,44 @@
 
 #include "cpu.h"
 
+#include "periph/eeprom.h"
+#include "net/eui_provider.h"
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+/**
+ * @name    MAC configuration
+ *          Offset of the MAC address in the EEPROM
+ */
+#define EEPROM_MAC_ADDR (0x1fe4)
+
+/**
+ * @brief    Constant in EEPROM provides a EUI-64, this is also printed on the board
+ */
+static inline int _eeprom_mac_get_eui64(const void *arg, eui64_t *addr)
+{
+    (void) arg;
+
+    if (eeprom_read(EEPROM_MAC_ADDR, addr, sizeof(eui64_t)) != sizeof(eui64_t)) {
+        return -1;
+    }
+
+    addr->uint64.u64 = byteorder_htonll(addr->uint64.u64).u64;
+
+    return 0;
+}
+
+/**
+ * @name    EUI-64 sources on the board
+ * @{
+ */
+#define EUI64_PROVIDER_FUNC   _eeprom_mac_get_eui64
+#define EUI64_PROVIDER_TYPE   NETDEV_AT86RF2XX
+#define EUI64_PROVIDER_INDEX  0
+/** @} */
+
 /**
  * @name xtimer configuration values
  * @{