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Your Kindle has two u-boot builds in it.
The first one that you see, which is intended to require only internal ram to run ...
And the fuller featured u-boot 'bist' .
At the first level u-boot that you see, enter the command:
bist
Which will load and run the 'other' u-boot build.
loady (ymodem load) and friends are built-in commands of the 'bist' u-boot.
ymodem did not used to work, but they must have fixed it sometime after the K5.
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