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147 lines
5.3 KiB
147 lines
5.3 KiB
5 months ago
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**中文** | [English](README_en.md)
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## 概述
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CV18xx 系列芯片面向民用消费监控 IP 摄像机、居家智能等多项产品领域而推出的高性能、低功耗芯片，集成了 H.264/H.265 视频压缩编码器和 ISP；支持数字寛动态、 3D 降噪、除雾、镜头畸变校正等多种图像增强和矫正算法，为客户提供专业级的视频图像质量。
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1. 处理器内核
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- 主处理器 RISCV C906 @ 1.0Ghz
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- 32KB I-cache, 64KB D-Cache
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- 集成矢量(Vector)及浮点运算单元 (FPU) .
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- 协处理器 RISCV C906 @ 700Mhz
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- 集成浮点运算单元 (FPU)
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2. 存储器接口
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- 内建 DRAM : DDR2 16bitx1, 最高速率达 1333Mbps , 容量512Mbit (64MB)
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- 支持SPI NOR flash 接口 (1.8V / 3.0V)
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- 支持 1, 2, 4 线模式
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- 最大支持 256MByte
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- 支持 SPI Nand flash 接口 (1.8V / 3.0V)
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- 支持 1KB/2KB/4KB page (对应的最大容量 16GB/32GB/64GB)
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- 使用器件本身内建的 ECC 模块
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3. 外设
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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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- 集成 MAC PHY 支持 10/100Mbps 全双工或半双工模式
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- 一个 USB Host / device 接口
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## Toolchain 下载
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1. RT-Thread 标准版工具链：`riscv64-unknown-elf-gcc` 下载地址 [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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2. RT-Smart 版工具链： `riscv64-unknown-linux-musl-gcc` 下载地址 [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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> 注：
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当前 bsp 只支持 Linux 编译，推荐 ubuntu 22.04
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正确解压后，在`rtconfig.py`中将 `riscv64-unknown-elf-gcc` 或 `riscv64-unknown-linux-musl-gcc` 工具链的本地路径加入 `EXEC_PATH` 或通过 `RTT_EXEC_PATH` 环境变量指定路径。
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```shell
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# RT-Thread 标准版按照以下配置：
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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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# RT-Samrt 版按照以下配置：
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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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## 编译
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### 依赖安装
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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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## 修改当前工程配置
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Linux平台下，执行：
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```shell
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$ scons --menuconfig
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```
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1. 默认编译为 RT-Thread 标准版，如果需要编译为 RT-Smart 版，请按照如下方式修改：
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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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(0x80000000) The virtural address of kernel start
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```
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2. 选择当前需要编译的目标开发板类型：
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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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它会自动下载env相关脚本到~/.env目录，然后执行
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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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更新完软件包后，执行 `scons -j10` 或 `scons -j10 --verbose` 来编译这个板级支持包，编译正确无误，会产生 rtthread.elf 文件。
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编译完成后脚本自动调用 `./mksdimg.sh` 脚本进行打包，并生成 `boot.sd`, 该文件即为 SD 卡启动的 kernel 文件。
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## 运行
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1. 将 SD 卡分为 2 个分区，第 1 个分区用于存放 bin 文件，第 2 个分区用于作为数据存储分区，分区格式为 `FAT32`。
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2. 将根目录下的 `fip.bin` 和 `boot.sd` 复制 SD 卡第一个分区中。后续更新固件只需要复制 `boot.sd` 文件即可。
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其中：
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- fip.bin：fsbl、 opensbi 和 uboot 打包后的 bin 文件
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- boot.sd：kernel 打包后的 bin 文件
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更新完 `boot.sd` 后， 重新上电可以看到串口的输出信息：
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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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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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Starting kernel ...
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heap: [0x802766b0 - 0x812766b0]
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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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