mtd caching in kernel 2.6

[Hyphen79]

Hello,

I have a problem with my mtdblock root device with the 2.6 kernel. When 
I write data to a mtd partition,
which is not the root, the data will be written immediately. But when I 
write something to the root partition,
it will be cached and written to it after a while (~30sec). What could 
this be and how could I deactivate
the caching? - the root is a cramdisk, not JFFS2 - and I have no 
problems with the 2.4 kernel.

Many thanks ahead!