diff --git a/src/mainboard/google/rush/mainboard.c b/src/mainboard/google/rush/mainboard.c
index ccac5e4d11..846a7ac55f 100644
--- a/src/mainboard/google/rush/mainboard.c
+++ b/src/mainboard/google/rush/mainboard.c
@@ -106,11 +106,3 @@ struct chip_operations mainboard_ops = {
         .name   = "rush",
         .enable_dev = mainboard_enable,
 };
-
-
-void mainboard_add_memory_ranges(struct memranges *map)
-{
-	/* Create non-cacheable region for DMA operations. */
-	memranges_insert(map, CONFIG_DRAM_DMA_START, CONFIG_DRAM_DMA_SIZE,
-			 MA_MEM  | MA_MEM_NC | MA_NS | MA_RW);
-}
diff --git a/src/mainboard/google/rush_ryu/mainboard.c b/src/mainboard/google/rush_ryu/mainboard.c
index ffa323476a..e19ad02612 100644
--- a/src/mainboard/google/rush_ryu/mainboard.c
+++ b/src/mainboard/google/rush_ryu/mainboard.c
@@ -78,10 +78,3 @@ struct chip_operations mainboard_ops = {
 	.name   = "rush_ryu",
 	.enable_dev = mainboard_enable,
 };
-
-void mainboard_add_memory_ranges(struct memranges *map)
-{
-	/* Create non-cacheable region for DMA operations. */
-	memranges_insert(map, CONFIG_DRAM_DMA_START, CONFIG_DRAM_DMA_SIZE,
-			MA_MEM  | MA_MEM_NC | MA_NS | MA_RW);
-}