The adapter you linked to is for 3.3 volt or 5.0 volt low-voltage interface, the Kindle is 1.8 volt.
Recheck all of your connections, because the interface is picking up those long strings from somewhere if you are not the person typing them.
run the command:
env
capture and post the result.
(I am sticking with my first reply, your u-boot installation is corrupt or incomplete. I.E: The first error message is correct.)
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