+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/