diff --git a/distrib/amd64/installimage/Makefile b/distrib/amd64/installimage/Makefile
index 1022de7e225f..d255a63b0b9d 100644
--- a/distrib/amd64/installimage/Makefile
+++ b/distrib/amd64/installimage/Makefile
@@ -1,11 +1,11 @@
-#	$NetBSD: Makefile,v 1.2 2012/08/17 16:56:34 riz Exp $
+#	$NetBSD: Makefile,v 1.3 2012/11/03 14:25:32 tsutsui Exp $
 
 .include <bsd.own.mk>
 
 INSTIMGBASE=	NetBSD-${DISTRIBVER}-amd64-install	# gives ${IMGBASE}.img
 
 BOOTDISK=	sd0			# for USB flash etc.
-IMAGEMB=	550			# for all installation binaries
+INSTIMAGEMB?=	550			# for all installation binaries
 
 PRIMARY_BOOT=		bootxx_ffsv1
 SECONDARY_BOOT=		boot
diff --git a/distrib/amd64/liveimage/emuimage/Makefile b/distrib/amd64/liveimage/emuimage/Makefile
index 8de7a4dc06f7..6ac13e8b9cf3 100644
--- a/distrib/amd64/liveimage/emuimage/Makefile
+++ b/distrib/amd64/liveimage/emuimage/Makefile
@@ -1,7 +1,10 @@
-#	$NetBSD: Makefile,v 1.2 2012/08/17 16:56:35 riz Exp $
+#	$NetBSD: Makefile,v 1.3 2012/11/03 14:25:32 tsutsui Exp $
 
 LIVEIMGBASE=	NetBSD-${DISTRIBVER}-amd64-live-wd0root	# gives ${IMGBASE}.img
 
 BOOTDISK=	wd0			# for QEMU etc.
+.if defined(EMUIMAGEMB)
+LIVEIMAGEMB=	${EMUIMAGEMB}
+.endif
 
 .include "${.CURDIR}/../Makefile.liveimage"
diff --git a/distrib/amd64/liveimage/usbimage/Makefile b/distrib/amd64/liveimage/usbimage/Makefile
index 87855289a9c8..31358f54b02a 100644
--- a/distrib/amd64/liveimage/usbimage/Makefile
+++ b/distrib/amd64/liveimage/usbimage/Makefile
@@ -1,9 +1,11 @@
-#	$NetBSD: Makefile,v 1.2 2012/08/17 16:56:35 riz Exp $
+#	$NetBSD: Makefile,v 1.3 2012/11/03 14:25:32 tsutsui Exp $
 
 LIVEIMGBASE=	NetBSD-${DISTRIBVER}-amd64-live-sd0root	# gives ${IMGBASE}.img
 
+USBIMAGEMB?=	1536            	# 2GB USB flash memories aren't 2GiB
+
 BOOTDISK=	sd0			# for USB flash etc.
-IMAGEMB=	1536            	# 2GB USB flash memories aren't 2GiB
+LIVEIMAGEMB=	${USBIMAGEMB}
 OMIT_SWAPIMG=	yes			# no need to write swap
 
 .include "${.CURDIR}/../Makefile.liveimage"
diff --git a/distrib/common/bootimage/Makefile.installimage b/distrib/common/bootimage/Makefile.installimage
index b2dd91902cbd..84918b2a9e43 100644
--- a/distrib/common/bootimage/Makefile.installimage
+++ b/distrib/common/bootimage/Makefile.installimage
@@ -1,4 +1,4 @@
-#	$NetBSD: Makefile.installimage,v 1.3 2012/04/22 07:23:42 tsutsui Exp $
+#	$NetBSD: Makefile.installimage,v 1.4 2012/11/03 14:25:32 tsutsui Exp $
 #
 # Common Makefile to create a bootable installation image for USB flash etc.
 #
@@ -8,6 +8,11 @@
 #	INSTIMGBASE
 #		Basename of the liveimage
 #
+# Optional variables:
+#	INSTIMAGEMB
+#		target image size in MB
+#		(if empty default IMAGEMB in Makefile.bootimage is used)
+#
 # See Makefile.bootimage for other variables.
 #
 
@@ -21,6 +26,9 @@ check_INSTIMGBASE: .PHONY .NOTMAIN
 .endif
 .endif
 
+.if defined(INSTIMAGEMB)
+IMAGEMB=	${INSTIMAGEMB}
+.endif
 SWAPMB=		0			# no swap
 OMIT_SWAPIMG=	yes			# nothing to write
 
diff --git a/distrib/common/bootimage/Makefile.liveimage b/distrib/common/bootimage/Makefile.liveimage
index d118653cda0e..295b9f5b6617 100644
--- a/distrib/common/bootimage/Makefile.liveimage
+++ b/distrib/common/bootimage/Makefile.liveimage
@@ -1,4 +1,4 @@
-#	$NetBSD: Makefile.liveimage,v 1.2 2012/01/22 16:50:00 tsutsui Exp $
+#	$NetBSD: Makefile.liveimage,v 1.3 2012/11/03 14:25:32 tsutsui Exp $
 #
 # Common Makefile to create a bootable FS image for USB flash or emulators
 #
@@ -8,6 +8,11 @@
 #	LIVEIMGBASE
 #		Basename of the liveimage
 #
+# Optional variables:
+#	LIVEIMAGEMB
+#		target image size in MB
+#		(if empty default IMAGEMB in Makefile.bootimage is used)
+#
 # See Makefile.bootimage for other variables.
 #
 
@@ -21,6 +26,10 @@ check_LIVEIMGBASE: .PHONY .NOTMAIN
 .endif
 .endif
 
+.if defined(LIVEIMAGEMB)
+IMAGEMB=	${LIVEIMAGEMB}
+.endif
+
 IMGBASE=	${LIVEIMGBASE}
 
 .include "${NETBSDSRCDIR}/distrib/common/bootimage/Makefile.bootimage"
diff --git a/distrib/i386/installimage/Makefile b/distrib/i386/installimage/Makefile
index bf0074737ef4..8815a48a1c93 100644
--- a/distrib/i386/installimage/Makefile
+++ b/distrib/i386/installimage/Makefile
@@ -1,11 +1,11 @@
-#	$NetBSD: Makefile,v 1.2 2012/08/17 16:56:35 riz Exp $
+#	$NetBSD: Makefile,v 1.3 2012/11/03 14:25:33 tsutsui Exp $
 
 .include <bsd.own.mk>
 
 INSTIMGBASE=	NetBSD-${DISTRIBVER}-i386-install	# gives ${IMGBASE}.img
 
 BOOTDISK=	sd0			# for USB flash etc.
-IMAGEMB=	512			# for all installation binaries
+INSTIMAGEMB?=	512			# for all installation binaries
 
 PRIMARY_BOOT=		bootxx_ffsv1
 SECONDARY_BOOT=		boot
diff --git a/distrib/i386/liveimage/emuimage/Makefile b/distrib/i386/liveimage/emuimage/Makefile
index 933fd4cc6762..2176dce7e616 100644
--- a/distrib/i386/liveimage/emuimage/Makefile
+++ b/distrib/i386/liveimage/emuimage/Makefile
@@ -1,7 +1,10 @@
-#	$NetBSD: Makefile,v 1.2 2012/08/17 16:56:35 riz Exp $
+#	$NetBSD: Makefile,v 1.3 2012/11/03 14:25:33 tsutsui Exp $
 
 LIVEIMGBASE=	NetBSD-${DISTRIBVER}-i386-live-wd0root	# gives ${IMGBASE}.img
 
 BOOTDISK=	wd0			# for QEMU etc.
+.if defined(EMUIMAGEMB)
+LIVEIMAGEMB=	${EMUIMAGEMB}
+.endif
 
 .include "${.CURDIR}/../Makefile.liveimage"
diff --git a/distrib/i386/liveimage/usbimage/Makefile b/distrib/i386/liveimage/usbimage/Makefile
index 8b3f3c050d32..fc9328469061 100644
--- a/distrib/i386/liveimage/usbimage/Makefile
+++ b/distrib/i386/liveimage/usbimage/Makefile
@@ -1,9 +1,11 @@
-#	$NetBSD: Makefile,v 1.2 2012/08/17 16:56:35 riz Exp $
+#	$NetBSD: Makefile,v 1.3 2012/11/03 14:25:33 tsutsui Exp $
 
 LIVEIMGBASE=	NetBSD-${DISTRIBVER}-i386-live-sd0root	# gives ${IMGBASE}.img
 
+USBIMAGEMB?=	1536            	# 2GB USB flash memories aren't 2GiB
+
 BOOTDISK=	sd0			# for USB flash etc.
-IMAGEMB=	1536            	# 2GB USB flash memories aren't 2GiB
+LIVEIMAGEMB=	${USBIMAGEMB}
 OMIT_SWAPIMG=	yes			# no need to write swap
 
 .include "${.CURDIR}/../Makefile.liveimage"
diff --git a/distrib/pmax/liveimage/emuimage/Makefile b/distrib/pmax/liveimage/emuimage/Makefile
index 7d581b1a2848..7ab4703d4b98 100644
--- a/distrib/pmax/liveimage/emuimage/Makefile
+++ b/distrib/pmax/liveimage/emuimage/Makefile
@@ -1,4 +1,4 @@
-#	$NetBSD: Makefile,v 1.2 2012/08/17 16:56:35 riz Exp $
+#	$NetBSD: Makefile,v 1.3 2012/11/03 14:25:33 tsutsui Exp $
 
 LIVEIMGBASE=	NetBSD-${DISTRIBVER}-pmax-live-sd0root	# gives ${IMGBASE}.img
 
@@ -6,6 +6,9 @@ LIVEIMGBASE=	NetBSD-${DISTRIBVER}-pmax-live-sd0root	# gives ${IMGBASE}.img
 
 KERN_SET=		kern-GENERIC
 BOOTDISK=		sd0
+.if defined(EMUIMAGEMB)
+LIVEIMAGEMB=		${EMUIMAGEMB}
+.endif
 PRIMARY_BOOT=		bootxx_ffs
 #SECONDARY_BOOT=	# boot.pmax is extracted from base.tgz
 SECONDARY_BOOT_ARG=	# nothing
diff --git a/distrib/sparc/liveimage/emuimage/Makefile b/distrib/sparc/liveimage/emuimage/Makefile
index 32a551f0086a..1c15f0213987 100644
--- a/distrib/sparc/liveimage/emuimage/Makefile
+++ b/distrib/sparc/liveimage/emuimage/Makefile
@@ -1,4 +1,4 @@
-#	$NetBSD: Makefile,v 1.2 2012/08/17 16:56:35 riz Exp $
+#	$NetBSD: Makefile,v 1.3 2012/11/03 14:25:33 tsutsui Exp $
 
 LIVEIMGBASE=	NetBSD-${DISTRIBVER}-sparc-live-sd0root	# gives ${IMGBASE}.img
 
@@ -6,6 +6,9 @@ LIVEIMGBASE=	NetBSD-${DISTRIBVER}-sparc-live-sd0root	# gives ${IMGBASE}.img
 
 KERN_SET=		kern-GENERIC
 BOOTDISK=		sd0
+.if defined(EMUIMAGEMB)
+LIVEIMAGEMB=		${EMUIMAGEMB}
+.endif
 PRIMARY_BOOT=		bootxx
 SECONDARY_BOOT=		boot
 SECONDARY_BOOT_ARG=	/${SECONDARY_BOOT}
diff --git a/distrib/sparc64/liveimage/emuimage/Makefile b/distrib/sparc64/liveimage/emuimage/Makefile
index f8e4815b3f18..8f5235fe9d87 100644
--- a/distrib/sparc64/liveimage/emuimage/Makefile
+++ b/distrib/sparc64/liveimage/emuimage/Makefile
@@ -1,4 +1,4 @@
-#	$NetBSD: Makefile,v 1.2 2012/08/17 16:56:36 riz Exp $
+#	$NetBSD: Makefile,v 1.3 2012/11/03 14:25:33 tsutsui Exp $
 
 LIVEIMGBASE=	NetBSD-${DISTRIBVER}-sparc64-live-sd0root # gives ${IMGBASE}.img
 
@@ -7,6 +7,9 @@ LIVEIMGBASE=	NetBSD-${DISTRIBVER}-sparc64-live-sd0root # gives ${IMGBASE}.img
 KERN_SET=		kern-GENERIC
 BOOTDISK=		sd0		# for QEMU
 #BOOTDISK=		wd0		# for Ultra5/10 image?
+.if defined(EMUIMAGEMB)
+LIVEIMAGEMB=		${EMUIMAGEMB}
+.endif
 PRIMARY_BOOT=		bootblk
 #SECONDARY_BOOT=	# nothing
 #SECONDARY_BOOT_ARG=	# unnecessary
diff --git a/distrib/sun2/liveimage/emuimage/Makefile b/distrib/sun2/liveimage/emuimage/Makefile
index 4a5e13656510..82ede9d71881 100644
--- a/distrib/sun2/liveimage/emuimage/Makefile
+++ b/distrib/sun2/liveimage/emuimage/Makefile
@@ -1,4 +1,4 @@
-#	$NetBSD: Makefile,v 1.2 2012/08/17 16:56:36 riz Exp $
+#	$NetBSD: Makefile,v 1.3 2012/11/03 14:25:33 tsutsui Exp $
 
 LIVEIMGBASE=	NetBSD-${DISTRIBVER}-sun2-live-sd0root	# gives ${IMGBASE}.img
 
@@ -6,6 +6,9 @@ LIVEIMGBASE=	NetBSD-${DISTRIBVER}-sun2-live-sd0root	# gives ${IMGBASE}.img
 
 KERN_SET=		kern-GENERIC
 BOOTDISK=		sd0
+.if defined(EMUIMAGEMB)
+LIVEIMAGEMB=		${EMUIMAGEMB}
+.endif
 PRIMARY_BOOT=		bootxx
 SECONDARY_BOOT=		ufsboot
 SECONDARY_BOOT_ARG=	/${SECONDARY_BOOT}
diff --git a/distrib/sun3/liveimage/emuimage/Makefile b/distrib/sun3/liveimage/emuimage/Makefile
index 4682cabd590c..ee39b72d5d87 100644
--- a/distrib/sun3/liveimage/emuimage/Makefile
+++ b/distrib/sun3/liveimage/emuimage/Makefile
@@ -1,4 +1,4 @@
-#	$NetBSD: Makefile,v 1.2 2012/08/17 16:56:36 riz Exp $
+#	$NetBSD: Makefile,v 1.3 2012/11/03 14:25:33 tsutsui Exp $
 
 LIVEIMGBASE=	NetBSD-${DISTRIBVER}-sun3-live-sd0root	# gives ${IMGBASE}.img
 
@@ -6,6 +6,9 @@ LIVEIMGBASE=	NetBSD-${DISTRIBVER}-sun3-live-sd0root	# gives ${IMGBASE}.img
 
 KERN_SET=		kern-GENERIC
 BOOTDISK=		sd0
+.if defined(EMUIMAGEMB)
+LIVEIMAGEMB=		${EMUIMAGEMB}
+.endif
 PRIMARY_BOOT=		bootxx
 SECONDARY_BOOT=		ufsboot
 SECONDARY_BOOT_ARG=	/${SECONDARY_BOOT}
diff --git a/distrib/vax/liveimage/emuimage/Makefile b/distrib/vax/liveimage/emuimage/Makefile
index fa975ef10f10..555bbcb7d784 100644
--- a/distrib/vax/liveimage/emuimage/Makefile
+++ b/distrib/vax/liveimage/emuimage/Makefile
@@ -1,12 +1,14 @@
-#	$NetBSD: Makefile,v 1.2 2012/08/17 16:56:36 riz Exp $
+#	$NetBSD: Makefile,v 1.3 2012/11/03 14:25:33 tsutsui Exp $
 
 LIVEIMGBASE=	NetBSD-${DISTRIBVER}-vax-live-ra0root	# gives ${IMGBASE}.img
 
 .include <bsd.own.mk>
 
+EMUIMAGEMB?=		1024		# ra0 can't handle 2GB image
+
 KERN_SET=		kern-GENERIC
 BOOTDISK=		ra0
-IMAGEMB=		1024		# ra0 can't handle 2GB image
+LIVEIMAGEMB=		${EMUIMAGEMB}
 PRIMARY_BOOT=		xxboot
 #SECONDARY_BOOT=	# boot is extracted from base.tgz
 SECONDARY_BOOT_ARG=	# nothing