Add logic to make external RAM usable with malloc()

components/esp32/include/esp_spiram.h

@@ -64,4 +64,16 @@ void esp_spiram_writeback_cache();
 
 
 
+/**
+ * @brief Reserve a pool of internal memory for specific DMA/internal allocations
+ *
+ * @param size Size of reserved pool in bytes
+ *
+ * @return
+ *          - ESP_OK on success
+ *          - ESP_ERR_NO_MEM when no memory available for pool
+ */
+esp_err_t esp_spiram_reserve_dma_pool(size_t size);
+
+
 #endif