All:

Our system will not have the unmount() function, since there will be no 'power down' sequence, but data can still be written to a file system at certain times. I was reading in How Yaffs Works, section 13.6 talks about Block summaries that were introduced to speed up mount times, but it does not state when these summaries are written,  I do see that Checkpoints are written for a file system when 'sync() is called. Is this also when the Block Summaries are written out also? 

Thanks

Chris