diff --git a/plat/imx/imx8m/imx8mm/include/platform_def.h b/plat/imx/imx8m/imx8mm/include/platform_def.h
index f25ceb0..1041459 100644
--- a/plat/imx/imx8m/imx8mm/include/platform_def.h
+++ b/plat/imx/imx8m/imx8mm/include/platform_def.h
@@ -29,6 +29,11 @@
 #define PLAT_WAIT_RET_STATE		U(1)
 #define PLAT_STOP_OFF_STATE		U(3)
 
+#define PLAT_PRI_BITS			U(3)
+#define PLAT_SDEI_CRITICAL_PRI		0x10
+#define PLAT_SDEI_NORMAL_PRI		0x20
+#define PLAT_SDEI_SGI_PRIVATE		U(9)
+
 #define BL31_BASE			U(0x920000)
 #define BL31_LIMIT			U(0x940000)
 
diff --git a/plat/imx/imx8m/imx8mm/platform.mk b/plat/imx/imx8m/imx8mm/platform.mk
index 3ead7b0..ac636fa 100644
--- a/plat/imx/imx8m/imx8mm/platform.mk
+++ b/plat/imx/imx8m/imx8mm/platform.mk
@@ -29,6 +29,8 @@
 				plat/imx/common/imx_sip_handler.c		\
 				plat/imx/common/imx_sip_svc.c			\
 				plat/imx/common/imx_uart_console.S		\
+				plat/imx/common/imx_ehf.c                       \
+				plat/imx/common/imx_sdei.c                      \
 				lib/xlat_tables/aarch64/xlat_tables.c		\
 				lib/xlat_tables/xlat_tables_common.c		\
 				lib/cpus/aarch64/cortex_a53.S			\
@@ -53,3 +55,6 @@
 
 IMX_BOOT_UART_BASE	?=	0x30890000
 $(eval $(call add_define,IMX_BOOT_UART_BASE))
+
+EL3_EXCEPTION_HANDLING := 1
+SDEI_SUPPORT := 1