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Which Flash File system - Yaffs or Keil's RL flash FS or Jffs2

As from the heading, the question is clear.
Which file system should be implemented on Flash memories?

Can Yaffs or Jffs2 be used for USB mass storage?

  • It's akin to asking 'Which car to buy?'
    The answer is 'It depends.'
    Besides, comparing Keil's RL flash FS to Yaffs or JFFS2 is like comparing a scooter to luxury car.

  • Besides, comparing Keil's RL flash FS to Yaffs or JFFS2 is like comparing a scooter to luxury car
    I want a luxury car.

    So the question is:
    The Jffs2 flash implementation code examples are for linux os (or rt linux or variants) only. How do i get it implemented with keil rtx kernel on any controller (of course considering that the hardware support is present)? is it even possible?