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145 changes: 145 additions & 0 deletions docs/zero/zero3/faq.md
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# FAQ

## Q1: 联系社区

请参考 https://docs.radxa.com/welcome

## Q2: Radxa ZERO 3 无法从 microSD 卡启动

如果您的 Radxa ZERO 3 无法从 microSD 卡启动,请按照以下步骤排查:

### 检查电源
- 确保使用 **5V** 电源适配器
- 推荐使用 [Radxa Power PD30W](../accessories/power/pd_30w)
- 检查 Type-C 线缆是否正常工作
- 确保电源接口连接正确(USB 2.0 OTG Type-C 端口)

### 检查 microSD 卡
1. **卡质量**:使用高质量、品牌可靠的 microSD 卡
2. **容量**:确保卡容量 ≥8GB
3. **烧录工具**:使用推荐的烧录工具(如 balenaEtcher)
4. **镜像完整性**:重新下载镜像并验证哈希值
5. **烧录过程**:确保烧录过程完整完成,没有中断

### 启动指示灯
- 正常启动时,电源指示灯应常亮
- 如果指示灯闪烁或不亮,可能是电源问题

### 串口调试
如果以上步骤都正常,可以通过串口连接查看启动日志:
1. 连接 UART 转 USB 适配器到调试串口
2. 使用串口工具(如 minicom、screen)查看输出
3. 观察启动过程中的错误信息

## Q3: Radxa ZERO 3 支持哪些存储设备启动?

Radxa ZERO 3 支持从以下设备启动:
- **microSD 卡**(主要启动方式)
- **eMMC**(需要额外模块)
- **USB 存储设备**(通过 USB 启动)

## Q4: 如何安装操作系统到 eMMC?

请参考 [安装操作系统到 eMMC](../low-level-dev/install-os-on-emmc) 指南。

## Q5: Radxa ZERO 3 的供电要求是什么?

Radxa ZERO 3 **只支持 5V 供电**:
- **输入电压**:5V DC
- **推荐功率**:≥15W(用于稳定运行)
- **接口**:USB 2.0 OTG Type-C 端口

:::warning 重要提示
请勿使用高于 5V 的电源适配器,这可能会损坏设备。
:::

## Q6: 如何通过串口调试 Radxa ZERO 3?

1. **连接串口**:
- 使用 UART 转 USB 适配器
- 连接 GND、TX、RX 引脚
- 波特率:1500000

2. **查看启动日志**:
- 连接串口后上电
- 在串口终端中查看启动过程

3. **常见串口工具**:
```bash
# Linux/macOS
screen /dev/ttyUSB0 1500000

# Windows
# 使用 PuTTY 或 Tera Term
```

## Q7: Radxa ZERO 3 的默认登录凭证是什么?

对于 Radxa OS 镜像:
- **用户名**:`radxa`
- **密码**:`radxa`

对于 Debian/Ubuntu 镜像:
- **用户名**:`root`
- **密码**:`radxa`

## Q8: 如何更新系统软件包?

```bash
# 更新软件包列表
sudo apt update

# 升级已安装的软件包
sudo apt upgrade

# 清理不再需要的包
sudo apt autoremove
```

## Q9: Radxa ZERO 3 支持 Wi-Fi 和蓝牙吗?

是的,Radxa ZERO 3 支持 Wi-Fi 和蓝牙:
- **Wi-Fi**:支持 2.4GHz 和 5GHz 频段
- **蓝牙**:支持 Bluetooth 5.0

如果遇到连接问题:
1. 检查天线是否连接(如有)
2. 确保驱动已正确加载
3. 检查网络配置

## Q10: 如何检查硬件信息?

```bash
# 查看 CPU 信息
cat /proc/cpuinfo

# 查看内存信息
free -h

# 查看存储设备
lsblk

# 查看网络接口
ip addr

# 查看系统版本
cat /etc/os-release
```

## Q11: 遇到其他问题怎么办?

1. **查看官方文档**:https://docs.radxa.com/zero/zero3
2. **访问社区论坛**:获取社区支持
3. **联系技术支持**:通过官方渠道提交问题

:::tip
在寻求帮助时,请提供以下信息:
- 使用的镜像版本
- 硬件配置
- 错误日志或截图
- 已尝试的解决步骤
:::
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# FAQ

## Q1: Community Support

Please refer to https://docs.radxa.com/welcome

## Q2: Radxa ZERO 3 Unable to Boot from microSD Card

If your Radxa ZERO 3 cannot boot from a microSD card, follow these troubleshooting steps:

### Check Power Supply
- Ensure using a **5V** power adapter
- Recommended: [Radxa Power PD30W](../accessories/power/pd_30w)
- Check if the Type-C cable is working properly
- Ensure the power interface is correctly connected (USB 2.0 OTG Type-C port)

### Check microSD Card
1. **Card Quality**: Use high-quality, reliable brand microSD cards
2. **Capacity**: Ensure card capacity ≥8GB
3. **Burn Tool**: Use recommended burning tools (like balenaEtcher)
4. **Image Integrity**: Redownload the image and verify the hash
5. **Burn Process**: Ensure the burning process completes fully without interruption

### Boot Indicators
- During normal boot, the power LED should stay on
- If the LED blinks or remains off, there may be a power issue

### Serial Debugging
If all above steps are normal, connect via serial port to check boot logs:
1. Connect UART to USB adapter to the debug serial port
2. Use serial tools (like minicom, screen) to view output
3. Observe error messages during the boot process

## Q3: What Storage Devices Does Radxa ZERO 3 Support for Boot?

Radxa ZERO 3 supports booting from:
- **microSD Card** (primary boot method)
- **eMMC** (requires additional module)
- **USB Storage Devices** (via USB boot)

## Q4: How to Install OS to eMMC?

Please refer to the [Install OS to eMMC](../low-level-dev/install-os-on-emmc) guide.

## Q5: What Are the Power Requirements for Radxa ZERO 3?

Radxa ZERO 3 **only supports 5V power supply**:
- **Input Voltage**: 5V DC
- **Recommended Power**: ≥15W (for stable operation)
- **Interface**: USB 2.0 OTG Type-C port

:::warning Important
Do not use power adapters above 5V as this may damage the device.
:::

## Q6: How to Debug Radxa ZERO 3 via Serial Port?

1. **Connect Serial Port**:
- Use UART to USB adapter
- Connect GND, TX, RX pins
- Baud rate: 1500000

2. **View Boot Logs**:
- Connect serial port before powering on
- View boot process in serial terminal

3. **Common Serial Tools**:
```bash
# Linux/macOS
screen /dev/ttyUSB0 1500000

# Windows
# Use PuTTY or Tera Term
```

## Q7: What Are the Default Login Credentials for Radxa ZERO 3?

For Radxa OS images:
- **Username**: `radxa`
- **Password**: `radxa`

For Debian/Ubuntu images:
- **Username**: `root`
- **Password**: `radxa`

## Q8: How to Update System Packages?

```bash
# Update package lists
sudo apt update

# Upgrade installed packages
sudo apt upgrade

# Clean up unnecessary packages
sudo apt autoremove
```

## Q9: Does Radxa ZERO 3 Support Wi-Fi and Bluetooth?

Yes, Radxa ZERO 3 supports Wi-Fi and Bluetooth:
- **Wi-Fi**: Supports 2.4GHz and 5GHz bands
- **Bluetooth**: Supports Bluetooth 5.0

If experiencing connection issues:
1. Check if antenna is connected (if applicable)
2. Ensure drivers are properly loaded
3. Check network configuration

## Q10: How to Check Hardware Information?

```bash
# View CPU information
cat /proc/cpuinfo

# View memory information
free -h

# View storage devices
lsblk

# View network interfaces
ip addr

# View system version
cat /etc/os-release
```

## Q11: What to Do for Other Issues?

1. **Check Official Documentation**: https://docs.radxa.com/zero/zero3
2. **Visit Community Forum**: Get community support
3. **Contact Technical Support**: Submit issues through official channels

:::tip
When seeking help, please provide:
- Image version used
- Hardware configuration
- Error logs or screenshots
- Steps already attempted to resolve
:::
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