Index: share/man/man4/md.4
===================================================================
--- share/man/man4/md.4
+++ share/man/man4/md.4
@@ -72,9 +72,32 @@
 options 	ROOTDEVNAME=\\"ufs:md0\\"
 .Ed
 .Pp
-The image in
+This would statically reserve 8MB area in the kernel and put data from the
+file referenced by the
+.Dv MFS_IMAGE
+at the beginning of that area.
+It is also possible to omit
+.Dv MD_ROOT_SIZE
+parameter, in which case the size of the ramdisk is to be
+determined automatically from the actual size of the 
 .Pa /h/foo/ARM-MD
-will be loaded as the initial image each boot.
+file.
+.Pp
+When available memory is limited, and read-write access to the ramdisk data
+is not required, the
+.Dv MFS_IMAGE_UZIP
+option can also be set to request automatic compression of the image at the
+kernel compile time with
+.Xr mkuzip 8
+before linking it into the kernel:
+.Bd -literal -offset indent
+makeoptions	MFS_IMAGE_UZIP
+options		ROOTDEVNAME=\\"ufs:md0.uzip\\"
+.Ed
+.Pp
+Run-time access to read-only uncompressed data is then provided by the
+.Xr geom_uzip 4 .
+.Pp
 To create the image to use, please follow the steps to create a file-backed
 disk found in the
 .Xr mdconfig 8
Index: sys/conf/kern.post.mk
===================================================================
--- sys/conf/kern.post.mk
+++ sys/conf/kern.post.mk
@@ -127,7 +127,19 @@
 .endif
 .endif
 
-${FULLKERNEL}: ${SYSTEM_DEP} vers.o
+.if defined(MFS_IMAGE_UZIP)
+MFS_IMAGE_IN:=	${MFS_IMAGE}
+MFS_IMAGE:=	${MFS_IMAGE_IN:T:R}.uzip
+MKUZP_CBSIZE?=	65536
+MKUZP_FLAGS?=	-Ld
+
+${MFS_IMAGE}: ${MFS_IMAGE_IN}
+	@echo compressing ${MFS_IMAGE_IN} ...
+	@mkuzip -S ${MKUZP_FLAGS} -s ${MKUZP_CBSIZE} -o ${.TARGET} \
+	    ${MFS_IMAGE_IN}
+.endif
+
+${FULLKERNEL}: ${SYSTEM_DEP} ${MFS_IMAGE} vers.o
 	@rm -f ${.TARGET}
 	@echo linking ${.TARGET}
 	${SYSTEM_LD}
Index: sys/conf/kern.pre.mk
===================================================================
--- sys/conf/kern.pre.mk
+++ sys/conf/kern.pre.mk
@@ -253,10 +253,10 @@
 
 EMBEDFS_FORMAT.arm?=		elf32-littlearm
 EMBEDFS_FORMAT.armv6?=		elf32-littlearm
-EMBEDFS_FORMAT.mips?=		elf32-tradbigmips
-EMBEDFS_FORMAT.mipsel?=		elf32-tradlittlemips
-EMBEDFS_FORMAT.mips64?=		elf64-tradbigmips
-EMBEDFS_FORMAT.mips64el?=	elf64-tradlittlemips
+EMBEDFS_FORMAT.mips?=		elf32-bigmips
+EMBEDFS_FORMAT.mipsel?=		elf32-littlemips
+EMBEDFS_FORMAT.mips64?=		elf64-bigmips
+EMBEDFS_FORMAT.mips64el?=	elf64-littlemips
 EMBEDFS_FORMAT.riscv?=		elf64-littleriscv
 .endif
 .endif