diff --git a/distrib/common/bootimage/Makefile.installimage b/distrib/common/bootimage/Makefile.installimage
index c66c327a3d5c..32bd54dab6cc 100644
--- a/distrib/common/bootimage/Makefile.installimage
+++ b/distrib/common/bootimage/Makefile.installimage
@@ -1,4 +1,4 @@
-#	$NetBSD: Makefile.installimage,v 1.7 2020/05/28 15:12:03 jmcneill Exp $
+#	$NetBSD: Makefile.installimage,v 1.8 2020/05/28 19:20:57 jmcneill Exp $
 #
 # Common Makefile to create a bootable installation image for USB flash etc.
 #
@@ -49,6 +49,9 @@ IMGDIR_EXTRA=	${RELEASEDIR}/${RELEASEMACHINEDIR}	${RELEASEMACHINEDIR}
 IMGDIR_EXCLUDE= 	-s ',./installation/cdrom.*,,gp'
 IMGDIR_EXCLUDE+=	-s ',./installation/liveimage.*,,gp'
 IMGDIR_EXCLUDE+=	-s ',./installation/installimage.*,,gp'
+.if defined(MD_IMGDIR_EXCLUDE)
+IMGDIR_EXCLUDE+=	${MD_IMGDIR_EXCLUDE}
+.endif
 
 IMGBASE=        ${INSTIMGBASE}
 
diff --git a/distrib/evbarm/installimage/Makefile b/distrib/evbarm/installimage/Makefile
index 6dee9eca76c5..2bd38b1beae4 100644
--- a/distrib/evbarm/installimage/Makefile
+++ b/distrib/evbarm/installimage/Makefile
@@ -1,10 +1,10 @@
-#	$NetBSD: Makefile,v 1.1 2020/05/28 15:23:43 jmcneill Exp $
+#	$NetBSD: Makefile,v 1.2 2020/05/28 19:20:57 jmcneill Exp $
 
 .include <bsd.own.mk>
 
 INSTIMGBASE=	NetBSD-${DISTRIBVER}-${MACHINE_ARCH}-install	# gives ${IMGBASE}.img
 
-INSTIMAGEMB?=	1550			# for all installation binaries
+INSTIMAGEMB?=	750			# for all installation binaries
 
 .if ${MACHINE_ARCH} == "aarch64"
 EFIBOOT=		${WORKDIR}/usr/mdec/bootaa64.efi
@@ -30,4 +30,7 @@ IMGFILE_EXTRA=								\
 	${SYSINSTDIR}/sysinstmsgs.pl	.				\
 	${SYSINSTDIR}/sysinst		.
 
+MD_IMGDIR_EXCLUDE=	-s ',./binary/gzimg.*,,gp'
+MD_IMGDIR_EXCLUDE+=	-s ',./binary/instkernel.*,,gp'
+
 .include "${NETBSDSRCDIR}/distrib/common/bootimage/Makefile.installimage"