feat(ble): support for putting ble code into flash on ESP32-C6

(cherry picked from commit 02d6d6fd7347525db15f1558023d5e336b96fe85)

Co-authored-by: zwl <zhaoweiliang@espressif.com>

components/bt/CMakeLists.txt

@@ -890,7 +890,7 @@ if(CONFIG_BT_ENABLED)
             add_prebuilt_library(libble_app
                 "${CMAKE_CURRENT_LIST_DIR}/controller/lib_esp32c6/esp32c6-bt-lib/esp32c61/libble_app.a")
         else()
-            if(CONFIG_BT_CTRL_RUN_IN_FLASH_ONLY)
+            if(CONFIG_BT_CTRL_RUN_IN_FLASH_ONLY AND CONFIG_IDF_TARGET_ESP32C2)
                 add_prebuilt_library(libble_app
                     "controller/lib_${target_name}/${target_name}-bt-lib/libble_app_flash.a")
             else()

components/bt/controller/esp32c6/Kconfig.in

@@ -697,3 +697,11 @@ config BT_LE_CTRL_CHECK_CONNECT_IND_ACCESS_ADDRESS
         Enabling this option will add stricter verification of the Access Address in the CONNECT_IND PDU.
         This improves security by ensuring that only connection requests with valid Access Addresses are accepted.
         If disabled, only basic checks are applied, improving compatibility.
+
+config BT_CTRL_RUN_IN_FLASH_ONLY
+    bool "Reduce BLE IRAM usage (READ DOCS FIRST) (EXPERIMENTAL)"
+    default n
+    help
+        Move most IRAM into flash. This will increase the usage of flash and reduce ble performance.
+        Because the code is moved to the flash, the execution speed of the code is reduced.
+        To have a small impact on performance, you need to enable flash suspend (SPI_FLASH_AUTO_SUSPEND).

components/bt/controller/esp32c6/bt.c

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2015-2024 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2015-2025 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -130,6 +130,10 @@ extern void r_ble_lll_rfmgmt_set_sleep_cb(void *s_cb, void *w_cb, void *s_arg,
 extern void r_ble_rtc_wake_up_state_clr(void);
 extern int os_msys_init(void);
 extern void os_msys_deinit(void);
+#if CONFIG_BT_CTRL_RUN_IN_FLASH_ONLY
+extern void r_ble_ll_scan_start_time_init_compensation(uint32_t init_compensation);
+extern void r_priv_sdk_config_insert_proc_time_set(uint16_t insert_proc_time);
+#endif // CONFIG_BT_CTRL_RUN_IN_FLASH_ONLY
 #if CONFIG_FREERTOS_USE_TICKLESS_IDLE
 extern sleep_retention_entries_config_t *r_esp_ble_mac_retention_link_get(uint8_t *size, uint8_t extra);
 extern void r_esp_ble_set_wakeup_overhead(uint32_t overhead);
@@ -494,11 +498,13 @@ static int esp_ecc_gen_dh_key(const uint8_t *peer_pub_key_x, const uint8_t *peer
     return rc;
 }
 
-static int esp_intr_alloc_wrapper(int source, int flags, intr_handler_t handler,
+static int esp_intr_alloc_wrapper(int source, int flags, intr_handler_t handler, void *arg, void **ret_handle_in)
-                                  void *arg, void **ret_handle_in)
 {
-    int rc = esp_intr_alloc(source, flags | ESP_INTR_FLAG_IRAM, handler,
+#if CONFIG_BT_CTRL_RUN_IN_FLASH_ONLY
-                            arg, (intr_handle_t *)ret_handle_in);
+    int rc = esp_intr_alloc(source, flags, handler, arg, (intr_handle_t *)ret_handle_in);
+#else
+    int rc = esp_intr_alloc(source, flags | ESP_INTR_FLAG_IRAM, handler, arg, (intr_handle_t *)ret_handle_in);
+#endif
     return rc;
 }
 
@@ -1046,6 +1052,10 @@ esp_err_t esp_bt_controller_enable(esp_bt_mode_t mode)
     coex_enable();
 #endif // CONFIG_SW_COEXIST_ENABLE
 
+#if CONFIG_BT_CTRL_RUN_IN_FLASH_ONLY
+    r_ble_ll_scan_start_time_init_compensation(500);
+    r_priv_sdk_config_insert_proc_time_set(500);
+#endif // CONFIG_BT_CTRL_RUN_IN_FLASH_ONLY
     if (r_ble_controller_enable(mode) != 0) {
         ret = ESP_FAIL;
         goto error;

components/bt/linker_esp_ble_controller.lf

@@ -1,8 +1,21 @@
+[sections:bt_iram_text]
+entries:
+    .iram1+
+
+[sections:high_perf_iram_text]
+entries:
+    .high_perf_code_iram1+
+
 [scheme:bt_default]
 entries:
     bt_bss -> dram0_bss
     bt_common -> dram0_bss
     data -> dram0_data
+    high_perf_iram_text -> iram0_text
+    if BT_CTRL_RUN_IN_FLASH_ONLY = y:
+        bt_iram_text -> flash_text
+    else:
+        bt_iram_text -> iram0_text
 
 # For the following fragments, order matters for
 # 'ALIGN(4) ALIGN(4, post) SURROUND(sym)', which generates:
@@ -27,7 +40,6 @@ entries:
             bt_common -> dram0_bss ALIGN(4) ALIGN(4, post) SURROUND(bt_common),
             data -> dram0_data  ALIGN(4) ALIGN(4, post) SURROUND(bt_data)
 
-
 [mapping:ble_app]
 archive: libble_app.a
 entries: