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docs: add UART2_M0 debug serial warning for ZERO 3 #2004

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8 changes: 8 additions & 0 deletions docs/zero/zero3/hardware-design/hardware-interface.md
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## 调试串口

ZERO 3 的调试串口使用 **UART2_M0**（40 PIN GPIO 的 Pin 8：TX，Pin 10：RX），默认波特率为 1500000n8。

:::warning 不建议将 UART2_M0 用作普通串口
UART2_M0 同时也是默认的 U-Boot 控制台。如果通过 rsetup 的 overlay 将 UART2_M0 启用为普通串口，串口上的输入会中断启动过程，导致设备无法正常启动。

如果您确实需要使用 UART2_M0，请先通过 `rsetup` 进行系统更新和 bootloader 更新，然后编辑 `/etc/default/u-boot`，将 `prompt` 和 `timeout` 取消注释并设置为 0，最后运行 `sudo u-boot-update` 重新生成启动配置。
:::

## 有线网口

## 40 PIN GPIO
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8 changes: 8 additions & 0 deletions ...us-plugin-content-docs/current/zero/zero3/hardware-design/hardware-interface.md
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## Debug Serial Port

The debug serial port of ZERO 3 uses **UART2_M0** (40-pin GPIO Pin 8: TX, Pin 10: RX), with a default baud rate of 1500000n8.

:::warning UART2_M0 is not recommended for use as a normal UART
UART2_M0 is also the default U-Boot console. If you enable UART2_M0 as a normal serial port through the rsetup overlay, input on the serial port will interrupt the boot process and the device may fail to boot.

If you really need to use UART2_M0, first update the system and bootloader via `rsetup`, then edit `/etc/default/u-boot` to uncomment `prompt` and `timeout` and set them to 0, and finally run `sudo u-boot-update` to rebuild the boot configuration.
:::

## Ethernet Port

## 40 PIN GPIO
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