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Raspberry PI 4-dm2.0BSP说明
1. 简介
树莓派4B的核心处理器为博通BCM2711（四核1.5GHz，Cortex A72架构，树莓派3是四核A53）。LPDDR4内存，由5V/3A USB-C供电或GPIO 5V。
外设支持上，引入了双频Wi-Fi，蓝牙5.0，千兆网卡，MIPI CSI相机接口，两个USB口，40个扩展帧。
这份RT-Thread BSP是针对 Raspberry Pi 4的一份移植，树莓派价格便宜, 使用者甚众，是研究和运行RT-Thread的可选平台之一。
2. 编译说明
推荐使用env工具，可以在console下进入到bsp\raspberry-pi\raspi4-64目录中，运行以下命令：
scons
来编译这个板级支持包。如果编译正确无误，会产生 rtthread.elf, rtthread.bin 文件。
3. 支持情况
| 驱动 | 支持情况 | 备注 |
|---|---|---|
| UART | 支持 | pl011驱动 |
| GPIO | 尚未支持 | 等待dm2.0相关代码合入主线 |
| SPI | 尚未支持 | 等待gpio合入主线 |
| WATCHDOG | 尚未支持 | 等待gpio合入主线 |
| HDMI | 尚未支持 | 等待gpio合入主线 |
| SDIO | 支持 | 能够正常运行在qemu，但是qemu对于raspi目前只支持pio传输，后续需要硬件进行详细测试 |
| ETH | 尚未支持 | 等待gpio合入主线 |