I need to do some experiments with JFFS2 on a recent Linux kernel ( and was hoping to use UML, with block2mtd or nandsim as my MTD, but either MTD configuration and consequently JFFS2 configuration isn't available in "make ARCH=um menuconfig", or I just can't find it.

I've searched Google and the list archive and it looks like JFFS2 worked with UML in the past, but maybe something has changed.

Is it possible to configure a UML kernel to support JFFS2?  If so, how?