RT-Thread 开发

1. 准备工作

开发环境：
- Ubuntu 22.04 虚拟机或主机
- Luckfox_Lyra_SDK_250815.tar.gz
硬件准备：
- Luckfox Lyra 系列主板
- USB 转 TTL 串口模块 x2
- USB Type-A to Type-C 数据线
- 100M/1000M 以太网线
- 路由器，用于开发板网络连接

2. Cortex-A7 RT-Thread 测试

本章节介绍如何编译并运行 Cortex-A7 RT-Thread。编译完成后，可将生成的固件烧录到开发板。

2.1 修改配置文件并编译

进入板级配置文件目录：
```
cd {SDK}/device/rockchip/rk3506
```

修改 amp_linux_mcu.its 配置文件，指定需要编译的 CPU 类型，可以选择 AP 或 MCU：

configurations {
        default = "conf";
        conf {
                description = "Rockchip AMP images";
                rollback-index = <0x0>;
                loadables = "amp2"; // 使用 amp2 运行 RT-Thread
                //loadables = "mcu"; // 使用 mcu 运行 Baremetal

                signature {
                        algo = "sha256,rsa2048";
                        padding = "pss";
                        key-name-hint = "dev";
                        sign-images = "loadables";
                };

                /* - run linux on cpu0
                 * - it is brought up by amp(that run on U-Boot)
                 * - it is boot entry depends on U-Boot
                 */
                linux {
                        description  = "linux-os";
                        arch         = "arm";
                        cpu          = <0xf00>;
                        thumb        = <0>;
                        hyp          = <0>;
                        load         = <0x00900000>;
                        udelay       = <0>;
                };
        };
};

返回 SDK 根目录，选择对应板级配置文件并执行编译。以下以 Luckfox Lyra Plus 为例：

./build.sh lunch

############### Rockchip Linux SDK ###############

Manifest: luckfox_linux6.1_rk3506_release_v1.4_20250620.xml

Log colors: message notice warning error fatal

Log saved at /home/ubuntu/Luckfox/rk3506/250815/output/sessions/2026-05-19_20-11-23
You're building on Linux
Lunch menu...pick the Luckfox Lyra hardware version:
选择 Luckfox Lyra 硬件版本:
                [0] RK3506G_Luckfox_Lyra
                [1] RK3506G_Luckfox_Lyra_Plus
                [2] RK3506B_Luckfox_Lyra_Ultra
                [3] RK3506B_Luckfox_Lyra_Ultra_W
                [4] RK3506B_Luckfox_Lyra_Zero_W
                [5] RK3506B_Luckfox_Lyra_Pi
                [6] RK3506B_Luckfox_Lyra_Pi_W
                [7] custom
Which would you like? [0~7][default:0]: 7
Pick a defconfig:

1. luckfox_lyra_buildroot_sdmmc_defconfig
2. luckfox_lyra_buildroot_spinand_defconfig
3. luckfox_lyra_pi-w_buildroot_emmc_defconfig
4. luckfox_lyra_pi-w_buildroot_sdmmc_defconfig
5. luckfox_lyra_pi_buildroot_emmc_defconfig
6. luckfox_lyra_pi_buildroot_sdmmc_defconfig
7. luckfox_lyra_plus_buildroot_sdmmc_defconfig
8. luckfox_lyra_plus_buildroot_spinand_defconfig
9. luckfox_lyra_ultra-w_buildroot_emmc_defconfig
10. luckfox_lyra_ultra_buildroot_emmc_defconfig
11. luckfox_lyra_zero-w_buildroot_sdmmc_defconfig
12. luckfox_lyra_zero-w_buildroot_spinand_defconfig
13. rk3506b_buildroot_emmc_amp_defconfig
14. rk3506b_buildroot_spinand_amp_defconfig
15. rk3506g_buildroot_spinand_amp_defconfig
Which would you like? [1]: 15
Switching to defconfig: /home/ubuntu/Luckfox/rk3506/250815/device/rockchip/.chip/rk3506g_buildroot_spinand_amp_defconfig
#
# configuration written to /home/ubuntu/Luckfox/rk3506/250815/output/.config
#
Using last kernel version(6.1)

首次编译需要执行完整编译：
```
./build.sh
```
完整编译成功后，后续开发可只编译指定模块：
```
./build.sh amp
./build.sh firmware
```
编译完成后，将生成的镜像重新烧录到开发板。

2.2 RT-Thread 终端

连接子系统 UART。使用 RX: GPIO0_A3、TX: GPIO0_A2，并将串口波特率设置为 1500000。子系统 UART 引脚位置如下：
- Luckfox Lyra B
- Luckfox Lyra Plus
- Luckfox Lyra Ultra
- Luckfox Lyra Pi
- Luckfox Lyra Zero W
开发板上电后，子系统 UART 会输出 msh 终端信息。
在 msh 终端中执行 help 命令，可以查看所有可用命令。