diff --git a/components/esp_hw_support/port/esp32c5/ocode_init.c b/components/esp_hw_support/port/esp32c5/ocode_init.c
index 2c5c5659cc..7476ce3379 100644
--- a/components/esp_hw_support/port/esp32c5/ocode_init.c
+++ b/components/esp_hw_support/port/esp32c5/ocode_init.c
@@ -27,7 +27,7 @@ static void set_ocode_by_efuse(int ocode_scheme_ver)
     REGI2C_WRITE_MASK(I2C_ULP, I2C_ULP_IR_FORCE_CODE, 1);
 }
 
-static void IRAM_ATTR calibrate_ocode(void)
+static void IRAM_ATTR NOINLINE_ATTR calibrate_ocode(void)
 {
     /*
     Bandgap output voltage is not precise when calibrate o-code by hardware sometimes, so need software o-code calibration (must turn off PLL).
diff --git a/components/esp_hw_support/port/esp32c61/ocode_init.c b/components/esp_hw_support/port/esp32c61/ocode_init.c
index 3ccc507707..84592b90df 100644
--- a/components/esp_hw_support/port/esp32c61/ocode_init.c
+++ b/components/esp_hw_support/port/esp32c61/ocode_init.c
@@ -28,7 +28,7 @@ static const char *TAG = "ocode_init";
     // REGI2C_WRITE_MASK(I2C_ULP, I2C_ULP_IR_FORCE_CODE, 1);
 // }
 
-static void calibrate_ocode(void)
+static void IRAM_ATTR NOINLINE_ATTR calibrate_ocode(void)
 {
     /*
     Bandgap output voltage is not precise when calibrate o-code by hardware sometimes, so need software o-code calibration (must turn off PLL).