diff --git a/release/picobsd/build/write_mfs_in_kernel.c b/release/picobsd/build/write_mfs_in_kernel.c
new file mode 100644
index 000000000000..358c7d943c33
--- /dev/null
+++ b/release/picobsd/build/write_mfs_in_kernel.c
@@ -0,0 +1,70 @@
+/*
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <phk@login.dknet.dk> wrote this file.  As long as you retain this notice you
+ * can do whatever you want with this stuff. If we meet some day, and you think
+ * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
+ * ----------------------------------------------------------------------------
+ *
+ * $Id$
+ *
+ * This program patches a filesystem into a kernel made with MFS_ROOT
+ * option.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <ufs/ffs/fs.h>
+
+main(int argc, char **argv)
+{
+	unsigned char *buf_kernel, *buf_fs, *p,*q;
+	int fd_kernel, fd_fs;
+	struct stat st_kernel, st_fs;
+	u_long l;
+
+	if (argc < 3) {
+		fprintf(stderr,"Usage:\n\t%s kernel fs\n");
+		exit(2);
+	}
+	fd_kernel = open(argv[1],O_RDWR);
+	if (fd_kernel < 0) { perror(argv[1]); exit(2); }
+	fstat(fd_kernel,&st_kernel);
+	fd_fs = open(argv[2],O_RDONLY);
+	if (fd_fs < 0) { perror(argv[2]); exit(2); }
+	fstat(fd_fs,&st_fs);
+	buf_kernel = malloc(st_kernel.st_size);
+	if (!buf_kernel) { perror("malloc"); exit(2); }
+	buf_fs = malloc(st_fs.st_size);
+	if (!buf_fs) { perror("malloc"); exit(2); }
+	if (st_kernel.st_size != read(fd_kernel,buf_kernel,st_kernel.st_size))
+		{ perror(argv[1]); exit(2); }
+	if (st_fs.st_size != read(fd_fs,buf_fs,st_fs.st_size))
+		{ perror(argv[2]); exit(2); }
+	for(l=0,p=buf_kernel; l < st_kernel.st_size - st_fs.st_size ; l++,p++ )
+		if(*p == 'M' && !strcmp(p,"MFS Filesystem goes here"))
+			goto found;
+	fprintf(stderr,"MFS filesystem signature not found in %s\n",argv[1]);
+	exit(1);
+    found:
+	for(l=0,q= p + SBOFF; l < st_fs.st_size - SBOFF ; l++,q++ )
+		if (*q)
+			goto fail;
+	memcpy(p+SBOFF,buf_fs+SBOFF,st_fs.st_size-SBOFF);
+	lseek(fd_kernel,0L,SEEK_SET);
+	if (st_kernel.st_size != write(fd_kernel,buf_kernel,st_kernel.st_size))
+		{ perror(argv[1]); exit(2); }
+	exit(0);
+    fail:
+	l += SBOFF;
+	fprintf(stderr,"Obstruction in kernel after %ld bytes (%ld Kbyte)\n",
+		l, l/1024);
+	fprintf(stderr,"Filesystem is %ld bytes (%ld Kbyte)\n",
+		(u_long)st_fs.st_size, (u_long)st_fs.st_size/1024);
+	exit(1);
+}
diff --git a/release/write_mfs_in_kernel.c b/release/write_mfs_in_kernel.c
new file mode 100644
index 000000000000..358c7d943c33
--- /dev/null
+++ b/release/write_mfs_in_kernel.c
@@ -0,0 +1,70 @@
+/*
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <phk@login.dknet.dk> wrote this file.  As long as you retain this notice you
+ * can do whatever you want with this stuff. If we meet some day, and you think
+ * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
+ * ----------------------------------------------------------------------------
+ *
+ * $Id$
+ *
+ * This program patches a filesystem into a kernel made with MFS_ROOT
+ * option.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <ufs/ffs/fs.h>
+
+main(int argc, char **argv)
+{
+	unsigned char *buf_kernel, *buf_fs, *p,*q;
+	int fd_kernel, fd_fs;
+	struct stat st_kernel, st_fs;
+	u_long l;
+
+	if (argc < 3) {
+		fprintf(stderr,"Usage:\n\t%s kernel fs\n");
+		exit(2);
+	}
+	fd_kernel = open(argv[1],O_RDWR);
+	if (fd_kernel < 0) { perror(argv[1]); exit(2); }
+	fstat(fd_kernel,&st_kernel);
+	fd_fs = open(argv[2],O_RDONLY);
+	if (fd_fs < 0) { perror(argv[2]); exit(2); }
+	fstat(fd_fs,&st_fs);
+	buf_kernel = malloc(st_kernel.st_size);
+	if (!buf_kernel) { perror("malloc"); exit(2); }
+	buf_fs = malloc(st_fs.st_size);
+	if (!buf_fs) { perror("malloc"); exit(2); }
+	if (st_kernel.st_size != read(fd_kernel,buf_kernel,st_kernel.st_size))
+		{ perror(argv[1]); exit(2); }
+	if (st_fs.st_size != read(fd_fs,buf_fs,st_fs.st_size))
+		{ perror(argv[2]); exit(2); }
+	for(l=0,p=buf_kernel; l < st_kernel.st_size - st_fs.st_size ; l++,p++ )
+		if(*p == 'M' && !strcmp(p,"MFS Filesystem goes here"))
+			goto found;
+	fprintf(stderr,"MFS filesystem signature not found in %s\n",argv[1]);
+	exit(1);
+    found:
+	for(l=0,q= p + SBOFF; l < st_fs.st_size - SBOFF ; l++,q++ )
+		if (*q)
+			goto fail;
+	memcpy(p+SBOFF,buf_fs+SBOFF,st_fs.st_size-SBOFF);
+	lseek(fd_kernel,0L,SEEK_SET);
+	if (st_kernel.st_size != write(fd_kernel,buf_kernel,st_kernel.st_size))
+		{ perror(argv[1]); exit(2); }
+	exit(0);
+    fail:
+	l += SBOFF;
+	fprintf(stderr,"Obstruction in kernel after %ld bytes (%ld Kbyte)\n",
+		l, l/1024);
+	fprintf(stderr,"Filesystem is %ld bytes (%ld Kbyte)\n",
+		(u_long)st_fs.st_size, (u_long)st_fs.st_size/1024);
+	exit(1);
+}