diff --git a/firmware/target/arm/imx233/dma-imx233.c b/firmware/target/arm/imx233/dma-imx233.c
index eba41958a9..97001210d2 100644
--- a/firmware/target/arm/imx233/dma-imx233.c
+++ b/firmware/target/arm/imx233/dma-imx233.c
@@ -28,8 +28,8 @@
 void imx233_dma_init(void)
 {
     /* Enable APHB and APBX */
-    __REG_CLR(HW_APBH_CTRL0) = __BLOCK_CLKGATE | __BLOCK_SFTRST;
-    __REG_CLR(HW_APBX_CTRL0) = __BLOCK_CLKGATE | __BLOCK_SFTRST;
+    imx233_reset_block(&HW_APBH_CTRL0);
+    imx233_reset_block(&HW_APBX_CTRL0);
 }
 
 void imx233_dma_reset_channel(unsigned chan)
diff --git a/firmware/target/arm/imx233/dma-imx233.h b/firmware/target/arm/imx233/dma-imx233.h
index bb88a746d0..c0727a51e1 100644
--- a/firmware/target/arm/imx233/dma-imx233.h
+++ b/firmware/target/arm/imx233/dma-imx233.h
@@ -152,6 +152,9 @@ struct apb_dma_command_t
 #define HW_APB_CHx_SEMA__PHORE_BM           0xff0000
 #define HW_APB_CHx_SEMA__PHORE_BP           16
 
+/* A single descriptor cannot transfer more than 2^16 bytes */
+#define IMX233_MAX_SINGLE_DMA_XFER_SIZE     (1 << 16)
+
 void imx233_dma_init(void);
 void imx233_dma_reset_channel(unsigned chan);
 /* only apbh channel have clkgate control */