Update documentation. (#280)

Update documentation to reference fusesoc init for Xilinx boards, for
those like me who have never used fusesoc before. Add a reference to the
board files for Digilent boards and comment on perhaps installing them
for other boards as appropriate.

Signed-off-by: Antony Vennard <antony@vennard.ch>
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Antony Vennard 3 years ago committed by GitHub
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@ -97,6 +97,14 @@ sudo dnf copr enable sharkcz/danny
sudo dnf install fusesoc
```

- If this is your first time using fusesoc, initialize fusesoc.
This is needed to be able to pull down fussoc library components referenced
by microwatt. Run

```
fusesoc init
```

- Create a working directory and point FuseSoC at microwatt:

```
@ -106,6 +114,8 @@ fusesoc library add microwatt /path/to/microwatt/
```

- Build using FuseSoC. For hello world (Replace nexys_video with your FPGA board such as --target=arty_a7-100):
You may wish to ensure you have [installed Digilent Board files](https://reference.digilentinc.com/vivado/installing-vivado/start#installing_digilent_board_files)
or appropriate files for your board first.

```
fusesoc run --target=nexys_video microwatt --memory_size=16384 --ram_init_file=/path/to/microwatt/fpga/hello_world.hex

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