heap: add a new heap caps attribute for RTC fast memory

components/heap/include/esp_heap_caps.h

@@ -41,6 +41,7 @@ extern "C" {
 #define MALLOC_CAP_DEFAULT          (1<<12) ///< Memory can be returned in a non-capability-specific memory allocation (e.g. malloc(), calloc()) call
 #define MALLOC_CAP_IRAM_8BIT        (1<<13) ///< Memory must be in IRAM and allow unaligned access
 #define MALLOC_CAP_RETENTION        (1<<14)
+#define MALLOC_CAP_RTCRAM           (1<<15) ///< Memory must be in RTC fast memory
 
 #define MALLOC_CAP_INVALID          (1<<31) ///< Memory can't be used / list end marker
 

components/heap/port/esp32s3/memory_layout.c

@@ -47,7 +47,7 @@ const soc_memory_type_desc_t soc_memory_types[] = {
     // Type 5: DRAM which is not DMA accesible
     { "NON_DMA_DRAM", { MALLOC_CAP_8BIT | MALLOC_CAP_DEFAULT, MALLOC_CAP_INTERNAL | MALLOC_CAP_32BIT, 0 }, false, false},
     // Type 6: RTC Fast RAM
-    { "RTCRAM", { MALLOC_CAP_8BIT | MALLOC_CAP_DEFAULT, MALLOC_CAP_INTERNAL | MALLOC_CAP_32BIT, 0 }, false, false},
+    { "RTCRAM", { MALLOC_CAP_8BIT | MALLOC_CAP_DEFAULT, MALLOC_CAP_INTERNAL | MALLOC_CAP_32BIT, MALLOC_CAP_RTCRAM }, false, false},
 };
 
 const size_t soc_memory_type_count = sizeof(soc_memory_types) / sizeof(soc_memory_type_desc_t);