diff --git a/plat/imx/imx8m/imx8mp/imx8mp_bl31_setup.c b/plat/imx/imx8m/imx8mp/imx8mp_bl31_setup.c
index c079982..167c4b6 100644
--- a/plat/imx/imx8m/imx8mp/imx8mp_bl31_setup.c
+++ b/plat/imx/imx8m/imx8mp/imx8mp_bl31_setup.c
@@ -113,6 +113,7 @@
 		u_register_t arg2, u_register_t arg3)
 {
 	static console_t console;
+	unsigned int val;
 	unsigned int i;
 
 	/* Enable CSU NS access permission */
@@ -127,7 +128,9 @@
 	imx_csu_init(csu_cfg);
 
 	/* config the ocram memory range for secure access */
-	mmio_write_32(IMX_IOMUX_GPR_BASE + 0x2c, 0xc1);
+	mmio_write_32(IMX_IOMUX_GPR_BASE + 0x2c, 0x4E1);
+	val = mmio_read_32(IMX_IOMUX_GPR_BASE + 0x2c);
+	mmio_write_32(IMX_IOMUX_GPR_BASE + 0x2c, val | 0x3DFF0000);
 
 	imx8m_caam_init();