nuttx

History

Stuart Ianna 34bfa2f7ba arch/risc-v/litex: Add platform specific tickless implementation. Adds a platform specific implementation for tickless schedular operation. This includes: - Tickless operation for vexriscv cores. - Tickless operation for vexriscv-smp cores. - Ticked operation for vexriscv-smp cores. Ticked operation for vexriscv core has been refactored. Additional default configuration added to demonstrate operation. Both tickless and ticked options use Litex timer0 for scheduling intervals. This is significantly faster than interfaceing with the risc-v mtimer through opensbi.		2023-08-16 16:59:27 +08:00
..
configs	arch/risc-v/litex: Add platform specific tickless implementation.	2023-08-16 16:59:27 +08:00
include
scripts	boards/litex/arty_a7: Support building fully linked executables.	2023-06-28 15:16:28 +08:00
src
Kconfig	Kconfig: Simplify the conditional default statement	2023-07-16 14:39:20 -03:00
README.txt

README.txt

1. Download and install toolchain

  $ curl https://static.dev.sifive.com/dev-tools/riscv64-unknown-elf-gcc-8.3.0-2019.08.0-x86_64-linux-ubuntu14.tar.gz

2. Follow instruction on https://github.com/enjoy-digital/litex to build the vexriscv softcore fpga gateware
   and flash to arty_a7 board

  $ cd litex-boards/litex_boards/targets
  $ ./digilent_arty.py --with-ethernet --with-sdcard --uart-baudrate 1000000 --cpu-type=vexriscv --cpu-variant=secure --build --load --flash

3. Configure and build NuttX

  $ mkdir ./nuttx; cd ./nuttx
  $ git clone https://github.com/apache/nuttx.git nuttx
  $ git clone https://github.com/apache/nuttx-apps.git apps
  $ cd nuttx
  $ make distclean
  $ ./tools/configure.sh arty_a7:nsh
  $ make V=1

4. Setup tftp server on your laptop, copy nuttx.bin to your tftpboot directory and change its name to boot.bin

5. Setup the wire connection(uart and tftp) between your board and laptop

6. Run  $ minicom -b 1000000 /dev/ttyUSB1 (the default baudrate on litex vexriscv is 1e6)
   when you see the bios prompt "litex>", type "netboot" and enter soon comes the nsh prompt

7. TODO

  Support GPIO/SPI/I2C/RTC/WDT/PWM
  Support RISC-V User mode