Update README.md

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Jiao Xianjun 2020-04-29 10:05:41 +02:00 committed by GitHub
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@ -103,7 +103,7 @@ The board actually is an Linux/Ubuntu computer which is running **hostapd** to o
Since the pre-built SD card image might not have the latest bug-fixes/updates, it is recommended to udpate the fpga bitstream on board.
- Install Vivado/SDK 2017.4.1 (If you don't need to generate new FPGA bitstream, WebPack version without license is enough)
- Install Vivado/SDK 2018.3 (If you don't need to generate new FPGA bitstream, WebPack version without license is enough)
- Setup environment variables (use absolute path):
```
export XILINX_DIR=your_Xilinx_directory