[knc1]

What book format are you using for your tests?
The same reader code is not used for all books.

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You don't mention, so I will - -
Get some experience using RP now, before you need it.
Trying to learn how to use it when you need it is almost too late.
And you had better add-in the CRP option and get used to that also before you need it.


Unless, of course, you really want a reason to install the serial port on your Kindle, because you are heading in that direction.

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PS:
Embedded systems are not developed by making changes on the device.
You network boot the OS that you are modifying.
Then, when things go wrong (and they will), all you have to do is revert the file on the network server and re-boot to the on-board image.