update README_en.md

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wuxx
2021-04-01 16:11:37 +08:00
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@@ -52,7 +52,8 @@ FPGA toolchain reference [icestorm](http://www.clifford.at/icestorm/)
gcc toolchain reference [riscv-gnu-toolchain](https://pingu98.wordpress.com/2019/04/08/how-to-build-your-own-cpu-from-scratch-inside-an-fpga/)
Alternatively, you can download the pre-built toolchain provided by xPack or SiFive
+ https://xpack.github.io/riscv-none-embed-gcc/install/
+ https://www.sifive.com/software
+ https://www.sifive.com/software
`icesprog` is command tool for iCESugar programit depend libusb and hidapi
`$sudo apt-get install libhidapi-dev`
`$sudo apt-get install libusb-1.0-0-dev`