hal: use WDT HAL IMPL in ESP32C2 ROM

components/hal/CMakeLists.txt

@@ -1,7 +1,6 @@
 idf_build_get_property(target IDF_TARGET)
 
-set(srcs "wdt_hal_iram.c"
-         "mpu_hal.c"
+set(srcs "mpu_hal.c"
          "cpu_hal.c"
          "efuse_hal.c"
          "${target}/efuse_hal.c"
@@ -9,6 +8,10 @@ set(srcs "wdt_hal_iram.c"
 
 set(includes "${target}/include" "include" "platform_port/include")
 
+if(NOT CONFIG_HAL_WDT_ROM_IMPL)
+    list(APPEND srcs "wdt_hal_iram.c")
+endif()
+
 if(NOT ${target} STREQUAL "esp32")
     list(APPEND srcs "cache_hal.c")
 endif()

components/hal/Kconfig

@@ -76,6 +76,23 @@ menu "Hardware Abstraction Layer (HAL) and Low Level (LL)"
         help
             Enable this flag to use HAL functions from ROM instead of ESP-IDF.
 
+            If keeping this as "n" in your project, you will have less free IRAM.
+            If making this as "y" in your project, you will increase free IRAM,
+            but you will lose the possibility to debug this module, and some new
+            features will be added and bugs will be fixed in the IDF source
+            but cannot be synced to ROM.
+
+    config HAL_WDT_HAS_ROM_IMPL
+        bool
+        default y if IDF_TARGET_ESP32C2
+
+    config HAL_WDT_ROM_IMPL
+        bool "Use WDT HAL implementation in ROM"
+        depends on HAL_WDT_HAS_ROM_IMPL
+        default y
+        help
+            Enable this flag to use HAL functions from ROM instead of ESP-IDF.
+
             If keeping this as "n" in your project, you will have less free IRAM.
             If making this as "y" in your project, you will increase free IRAM,
             but you will lose the possibility to debug this module, and some new

components/hal/linker.lf

@@ -16,7 +16,8 @@ entries:
     i2c_hal_iram (noflash)
     cpu_hal (noflash)
     soc_hal (noflash)
-    wdt_hal_iram (noflash)
+    if HAL_WDT_HAS_ROM_IMPL = n || HAL_WDT_ROM_IMPL = n:
+        wdt_hal_iram (noflash)
     if TWAI_ISR_IN_IRAM = y:
         twai_hal_iram (noflash)
     if IDF_TARGET_ESP32 = n: