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Upduino v2 with the ice40 up5k FPGA demos

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The serial demo sends the repeated message at 1 Mbs, but the readme says that it sends at 3 Mbs.

I have issue with simulating [usb-to-uart coding](https://github.com/osresearch/up5k/tree/master/usb) using iverilog. Please see below the output logs where `vvp` is forever stopped at simulation time step 0. ``` [phung@archlinux usb]$ iverilog -o...