[Yaffs] Initial mount time and production programming

How have people here dealt with yaffs's long-ish initial mount time after production programming?

AFAIK, the yaffs image given to an industrial flash programmer cannot contain a checkpoint, as checkpoints aren't able to deal with changing bad block positions and numbers.

This means of course that the first system boot is going to be quite lengthy (>1 minute on our 256Mb flash). We are getting a few complaints from the production test people about this. How have other people here dealt with
this issue?

Thanks,
Sven