diff --git a/src/nimble/esp_port/port/include/esp_nimble_cfg.h b/src/nimble/esp_port/port/include/esp_nimble_cfg.h
index a81162ee..4f9d1a15 100644
--- a/src/nimble/esp_port/port/include/esp_nimble_cfg.h
+++ b/src/nimble/esp_port/port/include/esp_nimble_cfg.h
@@ -18,11 +18,6 @@
 #define MYNEWT_VAL(x)                           MYNEWT_VAL_ ## x
 #define MYNEWT_VAL_CHOICE(_name, _val)          MYNEWT_VAL_ ## _name ## __ ## _val
 
-#ifndef IRAM_ATTR_64MCPU
-#define IRAM_ATTR_64MCPU IRAM_ATTR
-#endif
-
-
 #if CONFIG_IDF_TARGET_ESP32 || CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32S3
 #define NIMBLE_CFG_CONTROLLER    0
 #else
diff --git a/src/nimble/esp_port/port/src/exp_nimble_mem.c b/src/nimble/esp_port/port/src/exp_nimble_mem.c
index 384f8aca..633a4209 100644
--- a/src/nimble/esp_port/port/src/exp_nimble_mem.c
+++ b/src/nimble/esp_port/port/src/exp_nimble_mem.c
@@ -11,7 +11,7 @@
  #include "nimconfig.h"
  #include "../include/esp_nimble_mem.h"
 
- IRAM_ATTR void *nimble_platform_mem_malloc(size_t size)
+ void *nimble_platform_mem_malloc(size_t size)
  {
  #ifdef CONFIG_BT_NIMBLE_MEM_ALLOC_MODE_INTERNAL
      return heap_caps_malloc(size, MALLOC_CAP_INTERNAL|MALLOC_CAP_8BIT);
@@ -24,7 +24,7 @@
  #endif
  }
 
- IRAM_ATTR void *nimble_platform_mem_calloc(size_t n, size_t size)
+ void *nimble_platform_mem_calloc(size_t n, size_t size)
  {
  #ifdef CONFIG_BT_NIMBLE_MEM_ALLOC_MODE_INTERNAL
      return heap_caps_calloc(n, size, MALLOC_CAP_INTERNAL|MALLOC_CAP_8BIT);
@@ -37,7 +37,7 @@
  #endif
  }
 
- IRAM_ATTR void nimble_platform_mem_free(void *ptr)
+ void nimble_platform_mem_free(void *ptr)
  {
      heap_caps_free(ptr);
  }
diff --git a/src/nimble/porting/nimble/src/nimble_port.c b/src/nimble/porting/nimble/src/nimble_port.c
index f8454eba..3c3f4820 100644
--- a/src/nimble/porting/nimble/src/nimble_port.c
+++ b/src/nimble/porting/nimble/src/nimble_port.c
@@ -312,7 +312,7 @@ nimble_port_stop(void)
 }
 
 void
-IRAM_ATTR nimble_port_run(void)
+nimble_port_run(void)
 {
     struct ble_npl_event *ev;
 
@@ -328,7 +328,7 @@ IRAM_ATTR nimble_port_run(void)
 }
 
 struct ble_npl_eventq *
-IRAM_ATTR nimble_port_get_dflt_eventq(void)
+nimble_port_get_dflt_eventq(void)
 {
     return &g_eventq_dflt;
 }
diff --git a/src/nimble/porting/nimble/src/os_msys_init.c b/src/nimble/porting/nimble/src/os_msys_init.c
index e39f6803..b824f793 100644
--- a/src/nimble/porting/nimble/src/os_msys_init.c
+++ b/src/nimble/porting/nimble/src/os_msys_init.c
@@ -98,7 +98,7 @@ static struct os_sanity_check os_msys_sc;
  * @return                      The msys pool's minimum safe buffer count.
  */
 static int
-IRAM_ATTR os_msys_sanity_min_count(int idx)
+os_msys_sanity_min_count(int idx)
 {
     switch (idx) {
     case 0:
@@ -114,7 +114,7 @@ IRAM_ATTR os_msys_sanity_min_count(int idx)
 }
 
 static int
-IRAM_ATTR os_msys_sanity(struct os_sanity_check *sc, void *arg)
+os_msys_sanity(struct os_sanity_check *sc, void *arg)
 {
     const struct os_mbuf_pool *omp;
     int min_count;