2020-03-21 14:01:56 +08:00
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1. Download and install toolchain
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$ curl https://static.dev.sifive.com/dev-tools/riscv64-unknown-elf-gcc-8.3.0-2019.08.0-x86_64-linux-ubuntu14.tar.gz
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2. Follow instruction on https://github.com/enjoy-digital/litex to build the vexriscv softcore fpga gateware
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and flash to arty_a7 board
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3. Configure and build NuttX
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$ mkdir ./nuttx; cd ./nuttx
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2021-01-20 19:53:13 +08:00
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$ git clone https://github.com/apache/incubator-nuttx.git
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$ git clone https://github.com/apache/incubator-nuttx-apps.git
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2020-03-21 14:01:56 +08:00
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$ cd nuttx
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$ make distclean
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$ ./tools/configure.sh arty_a7:nsh
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$ make V=1
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4. Setup tftp server on your laptop, copy nuttx.bin to your tftpboot directory and change its name to boot.bin
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5. Setup the wire connection(uart and tftp) between your board and laptop
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6. Run $ minicom -b 1000000 /dev/ttyUSB1 (the default baudrate on litex vexriscv is 1e6)
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when you see the bios prompt "litex>", type "netboot" and enter soon comes the nsh prompt
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7. TODO
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Support GPIO/SPI/I2C/RTC/WDT/PWM
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Support RISC-V User mode
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