Guide to porting framer driver for PRI T1/E1

I need to integrate a framer driver with Asterisk for an embedded system project. I am aware that DAHDI is the official way to work with some PCI digital interface cards and think this driver porting task might as well go in this direction.

Questions:

  1. Is there a developer’s guide available for working with DAHDI?
  2. If the driver comes with both kernel and user layers to handle the PRI signaling and B-channel voice data, what is the proper approach for the solution? porting the chan_dahdi to fit these non-DAHDI layers?

Thanks.

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