Add support for the Olimex iCE40HX8K-EVB board #132
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This PR adds support for Olimex iCE40HX8K-EVB, a cheap development board based on the Lattice iCE40HX8K FPGA.
The board requires a separate microcontroller (e.g., Olimexino 32U4, officially supported by Olimex) to upload the bitstream to the onboard flash. A dedicated flashing utility is also required on the host PC.
UART communication doesn't work correctly when using Olimexino 32U4 as a bridge which forwards the communication to a PC. This may be due to a bug in Olimexino's firmware, as UART functions correctly when using a standalone USB-to-UART converter, suggesting the FPGA side works as expected.
Relevant documentation can be found on Olimex's official website or their GitHub repository.