If you use yaffs >= 2009-09-18 then this patch is no longer required.

--- kernel/2.6.29.1/series.default	(revision 1190)
+++ kernel/2.6.29.1/series.default	(working copy)
@@ -10,4 +10,3 @@
 balloon3-minipug.patch
 balloon3-minipugfb.patch
 yaffsconfig.patch -p0
-yaffsrootmode.patch