diff --git a/images/Makefile b/images/Makefile
index 2422969..da9cc8d 100644
--- a/images/Makefile
+++ b/images/Makefile
@@ -142,5 +142,6 @@
 
 clean-files := *.pbl *.pblb *.pblx *.map start_*.imximg *.img barebox.z start_*.kwbimg \
 	start_*.kwbuartimg *.socfpgaimg *.mlo *.t20img *.t20img.cfg *.t30img \
-	*.t30img.cfg *.t124img *.t124img.cfg *.mlospi *.mlo *.mxsbs *.mxssd
+	*.t30img.cfg *.t124img *.t124img.cfg *.mlospi *.mlo *.mxsbs *.mxssd \
+	start_*.simximg start_*.usimximg
 clean-files += pbl.lds
diff --git a/images/Makefile.imx b/images/Makefile.imx
index e581dbe..4ab2dcb 100644
--- a/images/Makefile.imx
+++ b/images/Makefile.imx
@@ -14,6 +14,12 @@
 	$(call if_changed,imx_image,$(CFG_$(@F)),)
 endif
 
+$(obj)/%.simximg: $(obj)/% FORCE
+	$(call if_changed,imx_image,$(CFG_$(patsubst %.simximg,%.imximg,$(@F))),-s)
+
+$(obj)/%.usimximg: $(obj)/% FORCE
+	$(call if_changed,imx_image,$(CFG_$(patsubst %.usimximg,%.imximg,$(@F))),-s -u)
+
 quiet_cmd_imx_sram_img ?= IMX-SRAM-IMG    $@
       cmd_imx_sram_img ?= cat $(obj)/$(patsubst %.imx-sram-img,%.pblb,$(2)) > $@; \
 		  $(call size_append, $(obj)/barebox.z) >> $@; \