[Tinkerphones] Inferno on Letux 400 Minibook

[David Boddie]

With a lot of help from Paul, I have been looking at running Inferno on the
Letux 400 - see the attached picture.

I started with Paul's L4 port for the Ben NanoNote to get up and running
because the supplied U-Boot sets up the framebuffer, making it easier to
debug problems.

Ultimately, the size of the screen and the type of keyboard on the NanoNote
make it less than ideal to debug and test on, so I used Paul's L4 work and
my existing code to get things working on the Letux 400 as well. He also
helped me to debug the LCD setup, making it possible to start looking at
supporting the keyboard and other peripherals.

One of the problems I encountered with the NanoNote was related to floating
point emulation, so I hope that the larger screen on the Minibook makes it
easier to print diagnostic information when things go wrong.

David
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