diff --git a/arch/riscv/boot/dts/spacemit/k1-x_NetBridge-C1.dts b/arch/riscv/boot/dts/spacemit/k1-x_NetBridge-C1.dts
index 79853c4c341a..ff957d9f494e 100644
--- a/arch/riscv/boot/dts/spacemit/k1-x_NetBridge-C1.dts
+++ b/arch/riscv/boot/dts/spacemit/k1-x_NetBridge-C1.dts
@@ -94,8 +94,8 @@
 
 		linux,cma {
 			compatible = "shared-dma-pool";
-			/* alloc memory from 0x40000000~0x80000000 */
-			alloc-ranges = <0 0x40000000 0 0x40000000>;
+			/* alloc memory from 0x40000000~0x70000000 */
+			alloc-ranges = <0 0x40000000 0 0x30000000>;
 			/* size of cma buffer is 384MByte */
 			size = <0 0x18000000>;
 			/* start address is 1Mbyte aligned */