Index: boot/arch/amd64/Makefile.inc
===================================================================
--- boot/arch/amd64/Makefile.inc	(revision 6e0e8c992daf9d94390386eed35f8f74072d093d)
+++ boot/arch/amd64/Makefile.inc	(revision 09285268680b736d54a4a59cd29ffeff37e8a272)
@@ -33,6 +33,11 @@
 	$(USPACEDIR)/srv/devmap/devmap \
 	$(USPACEDIR)/srv/rd/rd \
-	$(USPACEDIR)/srv/vfs/vfs \
-	$(USPACEDIR)/srv/fs/tmpfs/tmpfs \
+	$(USPACEDIR)/srv/vfs/vfs
+ifeq ($(RDFMT),tmpfs)
+	INIT_TASKS += $(USPACEDIR)/srv/fs/tmpfs/tmpfs
+endif
+ifeq ($(RDFMT),fat)
+	INIT_TASKS += $(USPACEDIR)/srv/fs/fat/fat
+endif
 
 RD_TASKS = \
@@ -41,9 +46,14 @@
 	$(USPACEDIR)/srv/kbd/kbd \
 	$(USPACEDIR)/srv/console/console \
-	$(USPACEDIR)/srv/fs/fat/fat \
 	$(USPACEDIR)/app/tetris/tetris \
 	$(USPACEDIR)/app/tester/tester \
 	$(USPACEDIR)/app/klog/klog \
 	$(USPACEDIR)/app/cli/cli
+ifneq ($(RDFMT),tmpfs)
+	RD_TASKS += $(USPACEDIR)/srv/fs/tmpfs/tmpfs
+endif
+ifneq ($(RDFMT),fat)
+	RD_TASKS += $(USPACEDIR)/srv/fs/fat/fat
+endif
 
 build: $(BASE)/image.iso
@@ -52,5 +62,10 @@
 	mkdir -p arch/$(ARCH)/iso/boot/grub
 	cp arch/$(ARCH)/grub/stage2_eltorito arch/$(ARCH)/iso/boot/grub/
-	cp arch/$(ARCH)/grub/menu.lst arch/$(ARCH)/iso/boot/grub/
+ifneq ($(RDFMT),tmpfs)
+	cat arch/$(ARCH)/grub/menu.lst | grep -v "tmpfs" >arch/$(ARCH)/iso/boot/grub/menu.lst
+endif
+ifneq ($(RDFMT),fat)
+	cat arch/$(ARCH)/grub/menu.lst | grep -v "fat" >arch/$(ARCH)/iso/boot/grub/menu.lst
+endif
 	cp $(KERNELDIR)/kernel.bin arch/$(ARCH)/iso/boot/
 	for task in $(INIT_TASKS) ; do \
@@ -60,5 +75,10 @@
 		cp $$task $(USPACEDIR)/dist/sbin/ ; \
 	done
+ifeq ($(RDFMT),tmpfs)
 	$(BASE)/tools/mktmpfs.py 4096 $(USPACEDIR)/dist/ arch/$(ARCH)/iso/boot/initrd.img
+endif
+ifeq ($(RDFMT),fat)
+	$(BASE)/tools/mkfat.sh $(USPACEDIR)/dist/ arch/$(ARCH)/iso/boot/initrd.img
+endif
 	mkisofs -J -r -b boot/grub/stage2_eltorito -no-emul-boot -boot-load-size 4 -boot-info-table -o $(BASE)/image.iso arch/$(ARCH)/iso/
 
Index: boot/arch/amd64/grub/menu.lst
===================================================================
--- boot/arch/amd64/grub/menu.lst	(revision 6e0e8c992daf9d94390386eed35f8f74072d093d)
+++ boot/arch/amd64/grub/menu.lst	(revision 09285268680b736d54a4a59cd29ffeff37e8a272)
@@ -11,4 +11,5 @@
 	module /boot/vfs
 	module /boot/tmpfs
+	module /boot/fat
 	module /boot/loader
 	module /boot/initrd.img
Index: boot/boot.config
===================================================================
--- boot/boot.config	(revision 6e0e8c992daf9d94390386eed35f8f74072d093d)
+++ boot/boot.config	(revision 09285268680b736d54a4a59cd29ffeff37e8a272)
@@ -79,2 +79,6 @@
 ! [ARCH=mips32] IMAGE (choice)
 
+# Ramdisk format
+@ "tmpfs" TMPFS image
+@ "fat" FAT16 image
+! RDFMT (choice)
Index: uspace/app/init/init.c
===================================================================
--- uspace/app/init/init.c	(revision 6e0e8c992daf9d94390386eed35f8f74072d093d)
+++ uspace/app/init/init.c	(revision 09285268680b736d54a4a59cd29ffeff37e8a272)
@@ -52,10 +52,10 @@
 }
 
-static bool mount_tmpfs(void)
+static bool mount_fs(const char *fstype)
 {
 	int rc = -1;
 	
 	while (rc < 0) {
-		rc = mount("tmpfs", "/", "initrd");
+		rc = mount(fstype, "/", "initrd");
 		
 		switch (rc) {
@@ -96,6 +96,8 @@
 	info_print();
 	sleep(5);	// FIXME
+	bool has_tmpfs = false;
+	bool has_fat = false;
 	
-	if (!mount_tmpfs()) {
+	if (!(has_tmpfs = mount_fs("tmpfs")) && !(has_fat = mount_fs("fat"))) {
 		printf(NAME ": Exiting\n");
 		return -1;
@@ -110,5 +112,12 @@
 	version_print();
 	
-	spawn("/sbin/fat");
+	/*
+	 * Spawn file system servers that were not loaded as init tasks.
+	 */
+	if (!has_fat)
+		spawn("/sbin/fat");
+	if (!has_tmpfs)
+		spawn("/sbin/tmpfs");
+		
 	spawn("/sbin/tetris");
 	spawn("/sbin/cli");