diff --git a/components/esp32/spiram.c b/components/esp32/spiram.c
index 20f9921ad2..004953741a 100644
--- a/components/esp32/spiram.c
+++ b/components/esp32/spiram.c
@@ -189,10 +189,11 @@ esp_err_t esp_spiram_add_to_heapalloc(void)
 #endif
 }
 
-
-static uint8_t *dma_heap;
-
 esp_err_t esp_spiram_reserve_dma_pool(size_t size) {
+    if (size == 0) {
+        return ESP_OK;
+    }
+
     ESP_EARLY_LOGI(TAG, "Reserving pool of %dK of internal memory for DMA/internal allocations", size/1024);
     /* Pool may be allocated in multiple non-contiguous chunks, depending on available RAM */
     while (size > 0) {
@@ -200,7 +201,8 @@ esp_err_t esp_spiram_reserve_dma_pool(size_t size) {
         next_size = MIN(next_size, size);
 
         ESP_EARLY_LOGD(TAG, "Allocating block of size %d bytes", next_size);
-        dma_heap = heap_caps_malloc(next_size, MALLOC_CAP_DMA|MALLOC_CAP_INTERNAL);
+
+        uint8_t *dma_heap = heap_caps_malloc(next_size, MALLOC_CAP_DMA|MALLOC_CAP_INTERNAL);
         if (!dma_heap || next_size == 0) {
             return ESP_ERR_NO_MEM;
         }
diff --git a/components/esp32s2/spiram.c b/components/esp32s2/spiram.c
index 895bda470f..1c453234b5 100644
--- a/components/esp32s2/spiram.c
+++ b/components/esp32s2/spiram.c
@@ -332,16 +332,32 @@ esp_err_t esp_spiram_add_to_heapalloc(void)
     return heap_caps_add_region(vaddr + size_for_flash, vaddr + DRAM0_DRAM1_DPORT_CACHE_SIZE -1);
 }
 
-
-static uint8_t *dma_heap;
-
 esp_err_t esp_spiram_reserve_dma_pool(size_t size) {
-    if (size==0) return ESP_OK; //no-op
+    if (size == 0) {
+        return ESP_OK;
+    }
+
     ESP_EARLY_LOGI(TAG, "Reserving pool of %dK of internal memory for DMA/internal allocations", size/1024);
-    dma_heap=heap_caps_malloc(size, MALLOC_CAP_DMA|MALLOC_CAP_INTERNAL);
-    if (!dma_heap) return ESP_ERR_NO_MEM;
-    uint32_t caps[]={MALLOC_CAP_DMA|MALLOC_CAP_INTERNAL, 0, MALLOC_CAP_8BIT|MALLOC_CAP_32BIT};
-    return heap_caps_add_region_with_caps(caps, (intptr_t) dma_heap, (intptr_t) dma_heap+size-1);
+    /* Pool may be allocated in multiple non-contiguous chunks, depending on available RAM */
+    while (size > 0) {
+        size_t next_size = heap_caps_get_largest_free_block(MALLOC_CAP_DMA|MALLOC_CAP_INTERNAL);
+        next_size = MIN(next_size, size);
+
+        ESP_EARLY_LOGD(TAG, "Allocating block of size %d bytes", next_size);
+
+        uint8_t *dma_heap = heap_caps_malloc(next_size, MALLOC_CAP_DMA|MALLOC_CAP_INTERNAL);
+        if (!dma_heap || next_size == 0) {
+            return ESP_ERR_NO_MEM;
+        }
+
+        uint32_t caps[] = { 0, MALLOC_CAP_DMA|MALLOC_CAP_INTERNAL, MALLOC_CAP_8BIT|MALLOC_CAP_32BIT };
+        esp_err_t e = heap_caps_add_region_with_caps(caps, (intptr_t) dma_heap, (intptr_t) dma_heap+next_size-1);
+        if (e != ESP_OK) {
+            return e;
+        }
+        size -= next_size;
+    }
+    return ESP_OK;
 }
 
 size_t esp_spiram_get_size(void)