diff --git a/ports/stm32/mpconfigboard_common.h b/ports/stm32/mpconfigboard_common.h
index ed30d17bdcd3..948897b21571 100644
--- a/ports/stm32/mpconfigboard_common.h
+++ b/ports/stm32/mpconfigboard_common.h
@@ -262,6 +262,26 @@
 #define MICROPY_HW_STM32WB_FLASH_SYNCRONISATION (1)
 #endif
 
+// RF core BLE configuration (a board should define
+// MICROPY_HW_RFCORE_BLE_NUM_GATT_ATTRIBUTES to override all values)
+#ifndef MICROPY_HW_RFCORE_BLE_NUM_GATT_ATTRIBUTES
+#define MICROPY_HW_RFCORE_BLE_NUM_GATT_ATTRIBUTES       (0)
+#define MICROPY_HW_RFCORE_BLE_NUM_GATT_SERVICES         (0)
+#define MICROPY_HW_RFCORE_BLE_ATT_VALUE_ARRAY_SIZE      (0)
+#define MICROPY_HW_RFCORE_BLE_NUM_LINK                  (1)
+#define MICROPY_HW_RFCORE_BLE_DATA_LENGTH_EXTENSION     (1)
+#define MICROPY_HW_RFCORE_BLE_PREPARE_WRITE_LIST_SIZE   (0)
+#define MICROPY_HW_RFCORE_BLE_MBLOCK_COUNT              (0x79)
+#define MICROPY_HW_RFCORE_BLE_MAX_ATT_MTU               (0)
+#define MICROPY_HW_RFCORE_BLE_SLAVE_SCA                 (0)
+#define MICROPY_HW_RFCORE_BLE_MASTER_SCA                (0)
+#define MICROPY_HW_RFCORE_BLE_LSE_SOURCE                (0) // use LSE to clock the rfcore (see errata 2.2.1)
+#define MICROPY_HW_RFCORE_BLE_MAX_CONN_EVENT_LENGTH     (0xffffffff)
+#define MICROPY_HW_RFCORE_BLE_HSE_STARTUP_TIME          (0x148)
+#define MICROPY_HW_RFCORE_BLE_VITERBI_MODE              (1)
+#define MICROPY_HW_RFCORE_BLE_LL_ONLY                   (1) // use LL only, we provide the rest of the BLE stack
+#endif
+
 #else
 #error Unsupported MCU series
 #endif
diff --git a/ports/stm32/rfcore.c b/ports/stm32/rfcore.c
index b11c4f202273..55fc229dd0c3 100644
--- a/ports/stm32/rfcore.c
+++ b/ports/stm32/rfcore.c
@@ -548,30 +548,30 @@ static const struct {
     uint16_t AttMtu;
     uint16_t SlaveSca;
     uint8_t MasterSca;
-    uint8_t LsSource;               // 0=LSE 1=internal RO
+    uint8_t LsSource;
     uint32_t MaxConnEventLength;
     uint16_t HsStartupTime;
     uint8_t ViterbiEnable;
-    uint8_t LlOnly;                 // 0=LL+Host, 1=LL only
+    uint8_t LlOnly;
     uint8_t HwVersion;
 } ble_init_params = {
-    0,
-    0,
-    0, // NumAttrRecord
-    0, // NumAttrServ
-    0, // AttrValueArrSize
-    1, // NumOfLinks
-    1, // ExtendedPacketLengthEnable
-    0, // PrWriteListSize
-    0x79, // MblockCount
-    0, // AttMtu
-    0, // SlaveSca
-    0, // MasterSca
-    1, // LsSource
-    0xffffffff, // MaxConnEventLength
-    0x148, // HsStartupTime
-    0, // ViterbiEnable
-    1, // LlOnly
+    0, // pBleBufferAddress
+    0, // BleBufferSize
+    MICROPY_HW_RFCORE_BLE_NUM_GATT_ATTRIBUTES,
+    MICROPY_HW_RFCORE_BLE_NUM_GATT_SERVICES,
+    MICROPY_HW_RFCORE_BLE_ATT_VALUE_ARRAY_SIZE,
+    MICROPY_HW_RFCORE_BLE_NUM_LINK,
+    MICROPY_HW_RFCORE_BLE_DATA_LENGTH_EXTENSION,
+    MICROPY_HW_RFCORE_BLE_PREPARE_WRITE_LIST_SIZE,
+    MICROPY_HW_RFCORE_BLE_MBLOCK_COUNT,
+    MICROPY_HW_RFCORE_BLE_MAX_ATT_MTU,
+    MICROPY_HW_RFCORE_BLE_SLAVE_SCA,
+    MICROPY_HW_RFCORE_BLE_MASTER_SCA,
+    MICROPY_HW_RFCORE_BLE_LSE_SOURCE,
+    MICROPY_HW_RFCORE_BLE_MAX_CONN_EVENT_LENGTH,
+    MICROPY_HW_RFCORE_BLE_HSE_STARTUP_TIME,
+    MICROPY_HW_RFCORE_BLE_VITERBI_MODE,
+    MICROPY_HW_RFCORE_BLE_LL_ONLY,
     0, // HwVersion
 };