nuttx

History

Radek Pesina 50a8ec62c4 Add eMMC driver support - Fix DMA addressing issues within litex_sendsetup/litex_recvsetup - Extend with handling specific to eMMC commands during init & use. - Cleanup of 4-bit BUS handling for SD and eMMC - For eMMC, Send CMD0 during init as per JEDEC v4.41 for pre-idle		2023-04-26 00:34:36 -04:00
..
configs	Add eMMC driver support	2023-04-26 00:34:36 -04:00
include
scripts
src
Kconfig	Add eMMC driver support	2023-04-26 00:34:36 -04:00
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