diff --git a/plat/imx/imx8qx/imx8qx_bl31_setup.c b/plat/imx/imx8qx/imx8qx_bl31_setup.c
index 0028e53..8b619bf 100644
--- a/plat/imx/imx8qx/imx8qx_bl31_setup.c
+++ b/plat/imx/imx8qx/imx8qx_bl31_setup.c
@@ -221,8 +221,14 @@
 		if (err) {
 			ERROR("Memreg get info failed, %u\n", mr_tee);
 		} else {
-			if ((BL32_LIMIT - 1) < end) {
-				err = sc_rm_memreg_alloc(ipc_handle, &mr, BL32_LIMIT , end);
+#ifdef SPD_trusty
+			reg_start = BL32_LIMIT;
+#else
+			/* Allow share memory to be accessible by OS */
+			reg_start = BL32_LIMIT - BL32_SHM_SIZE;
+#endif
+			if ((reg_start -1) < end) {
+				err = sc_rm_memreg_alloc(ipc_handle, &mr, reg_start , end);
 				if (err) {
 					ERROR("sc_rm_memreg_alloc failed, 0x%llx -- 0x%llx\n", (sc_faddr_t)BL32_LIMIT, end);
 				} else {
@@ -272,8 +278,13 @@
 			}
 #ifdef TEE_IMX8
 			if (mr_tee_atf_same) {
-				if ((BL32_LIMIT - 1) < end) {
-					reg_start = BL32_LIMIT;
+#ifdef SPD_trusty
+				reg_start = BL32_LIMIT;
+#else
+				/* Allow share memory to be accessible by OS */
+				reg_start = BL32_LIMIT - BL32_SHM_SIZE;
+#endif
+				if ((reg_start -1) < end) {
 					err = sc_rm_memreg_alloc(ipc_handle, &mr, reg_start, end);
 					if (err) {
 						ERROR("sc_rm_memreg_alloc failed, 0x%llx -- 0x%llx\n", reg_start, reg_end);
diff --git a/plat/imx/imx8qx/include/platform_def.h b/plat/imx/imx8qx/include/platform_def.h
index 4c0adbc..f09f61c 100644
--- a/plat/imx/imx8qx/include/platform_def.h
+++ b/plat/imx/imx8qx/include/platform_def.h
@@ -39,6 +39,7 @@
 #ifdef TEE_IMX8
 #define BL32_BASE			0xfe000000
 #define BL32_SIZE			0x02000000
+#define BL32_SHM_SIZE			0x00400000
 #define BL32_LIMIT			0x100000000
 #define PLAT_TEE_IMAGE_OFFSET		0x84000000
 #endif