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document how to build helloworld soc

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HeavyX
======
A FPGA SoC framework embracing cutting-edge open source technologies (nMigen, Yosys, SymbiFlow, Minerva, Nix, Rust).
"Hello World" SoC demo
++++++++++++++++++++++
Softcore RISC-V system-on-chip on the Lattice ECP5 Versa board, built with a 100% Verilog/VHDL-free and 100% open source toolchain. Runs a Rust "hello world" program.
Use nixpkgs unstable (known to work with ae71c13). Check https://nixbld.m-labs.hk/project/fpga for the status of the build with other nixpkgs versions.
Optional: set up the M-Labs key and binary substituter for Nix (otherwise Nix will recompile LLVM, rustc, etc. on your machine).
Create the file ``~/.config/nix/nix.conf`` with the following contents:
::
substituters = https://cache.nixos.org https://nixbld.m-labs.hk
trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= nixbld.m-labs.hk-1:5aSRVA5b320xbNvu30tqxVPXpld73bhtOeH6uAjRyHc=
Run ``nix-build -A simplesoc_ecp5 release.nix``
Bypass the ispCLOCK device using the jumpers on your board.
Create a ``versa.cfg`` file with:
::
interface ftdi
ftdi_vid_pid 0x0403 0x6010
ftdi_channel 0
ftdi_layout_init 0xfff8 0xfffb
reset_config none
adapter_khz 5000
jtag newtap ecp5 tap -irlen 8 -expected-id 0x01112043
Load the bitstream ``openocd -f versa.cfg -c "transport select jtag; init; svf result/top.svf; exit"``.
Watch the UART output at 115200bps.
Questions, comments: https://forum.m-labs.hk/
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