diff --git a/cpu/saml21/include/periph_cpu.h b/cpu/saml21/include/periph_cpu.h
index 9071ea4099..e383212ac3 100644
--- a/cpu/saml21/include/periph_cpu.h
+++ b/cpu/saml21/include/periph_cpu.h
@@ -85,6 +85,32 @@ typedef enum {
 #define RTT_MIN_OFFSET      (8U)
 /** @} */
 
+/**
+ * @brief   NVM User Row Mapping - Dedicated Entries
+ *          Config values will be applied at power-on.
+ * @{
+ */
+struct sam0_aux_cfg_mapping {
+    uint64_t bootloader_size            :  3; /**< BOOTPROT: Bootloader Size            */
+    uint64_t reserved_0                 :  1; /**< Factory settings - do not change.    */
+    uint64_t eeprom_size                :  3; /**< one of eight different EEPROM sizes  */
+    uint64_t reserved_1                 :  1; /**< Factory settings - do not change.    */
+    uint64_t bod33_level                :  6; /**< BOD33 threshold level at power-on.   */
+    uint64_t bod33_enable               :  1; /**< BOD33 Enable at power-on.            */
+    uint64_t bod33_action               :  2; /**< BOD33 Action at power-on.            */
+    uint64_t reserved_2                 :  9; /**< Factory settings - do not change.    */
+    uint64_t wdt_enable                 :  1; /**< WDT Enable at power-on.              */
+    uint64_t wdt_always_on              :  1; /**< WDT Always-On at power-on.           */
+    uint64_t wdt_period                 :  4; /**< WDT Period at power-on.              */
+    uint64_t wdt_window                 :  4; /**< WDT Window at power-on.              */
+    uint64_t wdt_ewoffset               :  4; /**< WDT Early Warning Interrupt Offset   */
+    uint64_t wdt_window_enable          :  1; /**< WDT Window mode enabled on power-on  */
+    uint64_t bod33_hysteresis           :  1; /**< BOD33 Hysteresis configuration       */
+    uint64_t reserved_3                 :  6; /**< Factory settings - do not change.    */
+    uint64_t nvm_locks                  : 16; /**< NVM Region Lock Bits.                */
+};
+/** @} */
+
 #ifdef __cplusplus
 }
 #endif