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rt-thread-official/bsp/cvitek/cv18xx_risc-v/README_en.md

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Overview

CV180ZB/CV1800B/CV1801B are high-performance, low-power chips designed for consumer surveillance IP cameras, smart home devices, and other product areas. They integrate H.264/H.265 video compression encoders and ISPs, and support various image enhancement and correction algorithms such as digital wide dynamic range, 3D noise reduction, defogging, and lens distortion correction, providing professional-grade video image quality to customers.

  1. Processor Core
  • Main processor: RISCV C906 @ 1.0Ghz
    • 32KB I-cache, 64KB D-Cache
    • Integrated vector and floating-point units (FPU).
  • Coprocessor: RISCV C906 @ 700Mhz
    • Integrated floating-point unit (FPU).
  1. Memory Interface
  • Built-in DRAM: DDR2 16bitx1, with a maximum speed of 1333Mbps, capacity of 512Mbit (64MB).
  • Support for SPI NOR flash interface (1.8V / 3.0V)
    • Support for 1, 2, 4-wire modes
    • Maximum support of 256MBytes
  • Support for SPI Nand flash interface (1.8V / 3.0V)
    • Support for 1KB/2KB/4KB page (corresponding to a maximum capacity of 16GB/32GB/64GB)
    • Use the built-in ECC module of the device itself
  1. Peripherals
  • Up to 26 GPIO pins on the MilkV-Duo 40-pin header provide access to internal peripherals such as SDIO, I2C, PWM, SPI, J-TAG, and UART.
  • Up to 3x I2C
  • Up to 5x UART
  • Up to 1x SDIO1
  • Up to 1x SPI
  • Up to 2x ADC
  • Up to 7x PWM
  • Up to 1x RUN
  • Up to 1x JTAG
  • Integrated MAC PHY supporting 10/100Mbps full-duplex or half-duplex mode
  • One USB Host / device interface

Toolchain Download

Download the riscv64-unknown-linux-musl-gcc toolchain from: https://github.com/RT-Thread/toolchains-ci/releases/download/v1.7/riscv64-linux-musleabi_for_x86_64-pc-linux-gnu_latest.tar.bz2

Note: The current BSP only supports Linux compilation.

After correct extraction, add the local path of the riscv64-unknown-linux-musl-gcc toolchain to EXEC_PATH in rtconfig.py, or specify the path through the RTT_EXEC_PATH environment variable.

$ export RTT_EXEC_PATH=/opt/riscv64-linux-musleabi_for_x86_64-pc-linux-gnu/bin

Compilation

  1. Installing Dependencies
$ sudo apt install -y device-tree-compiler

On the Linux platform, you can execute:

$ scons --menuconfig

Select the type of target board that you want to compile:

Board Type (milkv-duo)  --->
    ( ) milkv-duo
    (X) milkv-duo256m

It will automatically download environment-related scripts to the ~/.env directory, and then execute

$ source ~/.env/env.sh
$ pkgs --update

After updating the software packages, use scons -j10 or scons -j10 --verbose to compile this board support package. Alternatively, you can use the command scons --exec-path="GCC_toolchain_path" to specify the toolchain location for compilation. If the compilation is successful, an rtthread.elf file will be generated.

After the compilation is completed, the script automatically calls the ./mksdimg.sh script to package and generate the boot.sd file, which is the kernel file for SD card boot.

Running

  1. Divide the SD card into 2 partitions, with the first partition used to store bin files and the second partition used as a data storage partition. The partition format is FAT32.

  2. Copy the fip.bin and boot.sd files from the root directory to the first partition of the SD card. For subsequent firmware updates, you only need to copy the boot.sd file. Where:

  • fip.bin: the bin file after fsbl、opensbi and U-Boot are packaged
  • boot.sd: the bin file after the kernel is packaged

After updating boot.sd, power on again and you will see the serial output information:

U-Boot 2021.10 (Jun 26 2023 - 14:09:06 +0800)cvitek_cv180x

DRAM:  63.3 MiB
gd->relocaddr=0x82435000. offset=0x2235000
MMC:   cv-sd@4310000: 0
Loading Environment from <NULL>... OK
In:    serial
Out:   serial
Err:   serial
Net:   
Warning: ethernet@4070000 (eth0) using random MAC address - 62:80:19:6c:d4:64
eth0: ethernet@4070000
Hit any key to stop autoboot:  0 
Boot from SD ...
switch to partitions #0, OK
mmc0 is current device
132692 bytes read in 12 ms (10.5 MiB/s)
## Loading kernel from FIT Image at 81400000 ...
   Using 'config-cv1800b_milkv_duo_sd' configuration
   Trying 'kernel-1' kernel subimage
   Verifying Hash Integrity ... crc32+ OK
## Loading fdt from FIT Image at 81400000 ...
   Using 'config-cv1800b_milkv_duo_sd' configuration
   Trying 'fdt-cv1800b_milkv_duo_sd' fdt subimage
   Verifying Hash Integrity ... sha256+ OK
   Booting using the fdt blob at 0x8141b590
   Uncompressing Kernel Image
   Decompressing 296768 bytes used 42ms
   Loading Device Tree to 0000000081be5000, end 0000000081becb60 ... OK

Starting kernel ...

heap: [0x802766b0 - 0x812766b0]

 \ | /
- RT -     Thread Smart Operating System
 / | \     5.0.1 build Jun 28 2023 23:44:36
 2006 - 2022 Copyright by RT-Thread team
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Driver Support List

Driver Support Status Remarks
UART Supported Default baud rate 115200

Supported Development Boards

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