diff -urN linux-2.6.21.1/fs/Kconfig linux-2.6.21.1.new/fs/Kconfig
--- linux-2.6.21.1/fs/Kconfig	2007-06-08 14:07:09.000000000 +0200
+++ linux-2.6.21.1.new/fs/Kconfig	2007-06-08 14:09:26.000000000 +0200
@@ -419,6 +419,7 @@
 
 source "fs/xfs/Kconfig"
 source "fs/gfs2/Kconfig"
+source "fs/yaffs2/Kconfig"
 
 config OCFS2_FS
 	tristate "OCFS2 file system support"
diff -urN linux-2.6.21.1/fs/Makefile linux-2.6.21.1.new/fs/Makefile
--- linux-2.6.21.1/fs/Makefile	2007-06-08 14:07:09.000000000 +0200
+++ linux-2.6.21.1.new/fs/Makefile	2007-06-08 14:09:51.000000000 +0200
@@ -116,3 +116,4 @@
 obj-$(CONFIG_DEBUG_FS)		+= debugfs/
 obj-$(CONFIG_OCFS2_FS)		+= ocfs2/
 obj-$(CONFIG_GFS2_FS)           += gfs2/
+obj-$(CONFIG_YAFFS_FS)		+= yaffs2/