esp32s2: add config option to place RTC data in fast RAM

components/esp32s2/Kconfig

@@ -498,6 +498,13 @@ menu "ESP32S2-specific"
             If enabled, this disables the linking of binary libraries in the application build. Note
             that after enabling this Wi-Fi/Bluetooth will not work.
 
+    config ESP32S2_RTCDATA_IN_FAST_MEM
+        bool "Place RTC_DATA_ATTR and RTC_RODATA_ATTR variables into RTC fast memory segment"
+        default n
+        help
+            This option allows to place .rtc_data and .rtc_rodata sections into
+            RTC fast memory segment to free the slow memory region for ULP programs.
+
     config ESP32S2_ALLOW_RTC_FAST_MEM_AS_HEAP
         bool "Enable RTC fast memory for dynamic allocations"
         depends on !ESP32S2_MEMPROT_FEATURE

components/esp32s2/ld/esp32s2.ld

@@ -96,7 +96,7 @@ _data_seg_org = ORIGIN(rtc_data_seg);
    When the option is not defined then use slow memory segment
    else the data will be placed in fast memory segment
    TODO: check whether the rtc_data_location is correct for esp32s2 - IDF-761 */
-#ifndef CONFIG_ESP32_RTCDATA_IN_FAST_MEM
+#ifndef CONFIG_ESP32S2_RTCDATA_IN_FAST_MEM
 REGION_ALIAS("rtc_data_location", rtc_slow_seg );
 #else
 REGION_ALIAS("rtc_data_location", rtc_data_seg );

components/esp32s2/ld/esp32s2.project.ld.in

@@ -46,7 +46,7 @@ SECTIONS
      named rtc_wake_stub*.c and the data marked with
      RTC_DATA_ATTR, RTC_RODATA_ATTR attributes.
      The memory location of the data is dependent on
-     CONFIG_ESP32_RTCDATA_IN_FAST_MEM option.
+     CONFIG_ESP32S2_RTCDATA_IN_FAST_MEM option.
   */
   .rtc.data :
   {
@@ -75,7 +75,7 @@ SECTIONS
      User data marked with RTC_NOINIT_ATTR will be placed
      into this section. See the file "esp_attr.h" for more information.
 	 The memory location of the data is dependent on
-     CONFIG_ESP32_RTCDATA_IN_FAST_MEM option.
+     CONFIG_ESP32S2_RTCDATA_IN_FAST_MEM option.
   */
   .rtc_noinit (NOLOAD):
   {

tools/unit-test-app/configs/single_core_2_s2

@@ -3,4 +3,4 @@ CONFIG_IDF_TARGET="esp32s2"
 TEST_EXCLUDE_COMPONENTS=libsodium bt app_update freertos esp32s2 esp_timer driver heap pthread soc spi_flash vfs
 CONFIG_MEMMAP_SMP=n
 CONFIG_FREERTOS_UNICORE=y
-CONFIG_ESP32_RTCDATA_IN_FAST_MEM=y
+CONFIG_ESP32S2_RTCDATA_IN_FAST_MEM=y

tools/unit-test-app/configs/single_core_s2

@@ -3,4 +3,4 @@ CONFIG_IDF_TARGET="esp32s2"
 TEST_COMPONENTS=freertos esp32s2 esp_timer driver heap pthread soc spi_flash vfs test_utils
 CONFIG_MEMMAP_SMP=n
 CONFIG_FREERTOS_UNICORE=y
-CONFIG_ESP32_RTCDATA_IN_FAST_MEM=y
+CONFIG_ESP32S2_RTCDATA_IN_FAST_MEM=y