Is there anyone out there who has successfully mounted yaffs2 image taken from an HTC Desire phone to UBUNTU 12?

I read a lot of posts about that but I still have problems.

I need specific information (step by step) and if possible from people who have already done it. Thanks.

I found that task quite hard to solve. I read hundreds of posts on this issue but I still have problems... Only the (empty) lost+found directory can be shown on my UBUNTU machine.