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-[中文](README.md) | **English**
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-
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-## Overview
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-The CV18xx series of chips are high-performance, low-power chips launched for various products in the field of civilian consumer surveillance IP cameras, smart homes, and more. These chips integrate H.264/H.265 video compression encoders, as well as ISP; they support various image enhancement and correction algorithms such as digital wide dynamic range, 3D noise reduction, defogging, and lens distortion correction, providing customers with professional-level video image quality.
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-
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-1. Processor Core
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-- Main Processor: RISC-V C906 @ 1.0Ghz
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- - 32KB I-cache, 64KB D-Cache
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- - Integrated Vector and Floating-Point Unit (FPU).
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-- Co-processor: RISC-V C906 @ 700Mhz
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- - Integrated Floating-Point Unit (FPU)
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-
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-2. Storage Interface
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-- Built-in DRAM: DDR2 16bitx1, with a maximum speed of 1333Mbps, and a capacity of 512Mbit (64MB)
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-- Support for SPI NOR flash interface (1.8V / 3.0V)
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- - Supports 1, 2, 4 line modes
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- - Maximum support of 256MByte
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-- Support for SPI Nand flash interface (1.8V / 3.0V)
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- - Supports 1KB/2KB/4KB page (corresponding to maximum capacity of 16GB/32GB/64GB)
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- - Utilizes the device's built-in ECC module
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-
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-3. Peripherals
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-- 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
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-- Up to 3x I2C
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-- Up to 5x UART
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-- Up to 1x SDIO1
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-- Up to 1x SPI
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-- Up to 2x ADC
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-- Up to 7x PWM
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-- Up to 1x RUN
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-- Up to 1x JTAG
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-- Integrated MAC PHY supports 10/100Mbps full or half duplex mode
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-- One USB host/device interface
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-
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-4. [GPIO pinout](https://milkv.io/docs/duo/getting-started/duo256m#gpio-pinout)
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-
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-## Toolchain Download
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-1. RT-Thread Standard Edition Toolchain: `riscv64-unknown-elf-gcc` Download Link [https://occ-oss-prod.oss-cn-hangzhou.aliyuncs.com/resource//1705395512373/Xuantie-900-gcc-elf-newlib-x86_64-V2.8.1-20240115.tar.gz](https://occ-oss-prod.oss-cn-hangzhou.aliyuncs.com/resource//1705395512373/Xuantie-900-gcc-elf-newlib-x86_64-V2.8.1-20240115.tar.gz)
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-
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-2. RT-Smart Edition Toolchain: `riscv64-unknown-linux-musl-gcc` Download Link [https://github.com/RT-Thread/toolchains-ci/releases/download/v1.7/riscv64-linux-musleabi_for_x86_64-pc-linux-gnu_latest.tar.bz2](https://github.com/RT-Thread/toolchains-ci/releases/download/v1.7/riscv64-linux-musleabi_for_x86_64-pc-linux-gnu_latest.tar.bz2)
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-
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-> Note:
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-The current bsp only supports Linux compilation, and it is recommended to use Ubuntu 22.04
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-
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-After correctly extracting, add the local path of the `riscv64-unknown-elf-gcc` or `riscv64-unknown-linux-musl-gcc` toolchain to `EXEC_PATH` in `rtconfig.py` or specify the path through the `RTT_EXEC_PATH` environment variable.
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-
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-```shell
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-# For RT-Thread Standard Edition, use the following configuration:
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-$ export RTT_CC_PREFIX=riscv64-unknown-elf-
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-$ export RTT_EXEC_PATH=/opt/Xuantie-900-gcc-elf-newlib-x86_64-V2.8.1/bin
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-
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-# For RT-Smart Edition, use the following configuration:
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-$ export RTT_CC_PREFIX=riscv64-unknown-linux-musl-
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-$ export RTT_EXEC_PATH=/opt/riscv64-linux-musleabi_for_x86_64-pc-linux-gnu/bin
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-```
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-
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-## Compilation
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-
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-### Dependency Installation
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-```shell
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-$ sudo apt install -y scons libncurses5-dev device-tree-compiler
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-```
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-
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-## Modify Current Project Configuration
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-
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-For the Linux platform, execute:
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-```shell
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-$ scons --menuconfig
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-```
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-
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-1. By default, compile as RT-Thread Standard Edition. If you need to compile as RT-Smart Edition, modify as follows:
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-```shell
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-RT-Thread Kernel --->
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- [*] Enable RT-Thread Smart (microkernel on kernel/userland)
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-
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- (0x80000000) The virtual address of kernel start
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-```
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-
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-2. Select the current target development board type:
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-```shell
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-Board Type (milkv-duo) --->
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- ( ) milkv-duo
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- ( ) milkv-duo-spinor
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- (X) milkv-duo256m
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- ( ) milkv-duo256m-spinor
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-```
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-
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-It will automatically download relevant scripts to the ~/.env directory, then execute:
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-```shell
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-$ source ~/.env/env.sh
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-$ pkgs --update
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-```
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-After updating the software package, execute `scons -j10` or `scons -j10 --verbose` to compile this board support package. If the compilation is successful, an rtthread.elf file will be generated.
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-
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-After the compilation is complete, the script automatically calls the `./mksdimg.sh` script to package and generate `boot.sd`, which is the kernel file for SD card startup.
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-
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-## Running
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-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, with `FAT32` format.
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-2. Copy the `fip.bin` and `boot.sd` files from the root directory to the first partition of the SD card. Subsequent firmware updates only require copying the `boot.sd` file.
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-Where:
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-- fip.bin: fsbl, opensbi, and uboot packaged bin file
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-- boot.sd: kernel packaged bin file
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-
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-After updating `boot.sd`, restart to see the serial port output:
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-
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-```shell
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-U-Boot 2021.10 (Jun 26 2023 - 14:09:06 +0800)cvitek_cv180x
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-
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-DRAM: 63.3 MiB
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-gd->relocaddr=0x82435000. offset=0x2235000
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-MMC: cv-sd@4310000: 0
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-Loading Environment from <NULL>... OK
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-In: serial
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-Out: serial
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-Err: serial
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-Net:
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-Warning: ethernet@4070000 (eth0) using random MAC address - 62:80:19:6c:d4:64
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-eth0: ethernet@4070000
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-Hit any key to stop autoboot: 0
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-Boot from SD ...
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-switch to partitions #0, OK
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-mmc0 is current device
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-132692 bytes read in 12 ms (10.5 MiB/s)
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-## Loading kernel from FIT Image at 81400000 ...
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- Using 'config-cv1800b_milkv_duo_sd' configuration
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- Trying 'kernel-1' kernel subimage
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- Verifying Hash Integrity ... crc32+ OK
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-## Loading fdt from FIT Image at 81400000 ...
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- Using 'config-cv1800b_milkv_duo_sd' configuration
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- Trying 'fdt-cv1800b_milkv_duo_sd' fdt subimage
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- Verifying Hash Integrity ... sha256+ OK
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- Booting using the fdt blob at 0x8141b590
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- Uncompressing Kernel Image
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- Decompressing 296768 bytes used 42ms
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- Loading Device Tree to 0000000081be5000, end 0000000081becb60 ... OK
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-
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-Starting kernel ...
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-
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-heap: [0x802766b0 - 0x812766b0]
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-
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- \ | /
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-- RT - Thread Operating System
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- / | \ 5.1.0 build Apr 7 2024 23:33:20
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- 2006 - 2024 Copyright by RT-Thread team
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-Hello RISC-V!
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-msh />
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-```
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Chen Wang