docs: add UART2_M0 debug serial warning for ZERO 3 - #2004
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The debug serial port of ZERO 3 uses UART2_M0 (40-pin GPIO Pin 8 TX / Pin 10 RX) at 1500000n8 by default. UART2_M0 is also the default U-Boot console, so enabling it as a normal UART via rsetup overlay can interrupt the boot process. Document this limitation and the workaround (system/bootloader update via rsetup, /etc/default/u-boot prompt/timeout = 0, sudo u-boot-update). Fixes radxa-docs#418
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Fixes #418
Summary
The debug serial port of Radxa ZERO 3 uses UART2_M0 (40-pin GPIO Pin 8: TX, Pin 10: RX) at 1500000n8 by default. However, UART2_M0 is also the default U-Boot console: if a user enables UART2_M0 as a normal UART through the
rsetupoverlay, serial input during boot interrupts the boot process and the device may fail to boot (see radxa-build/radxa-zero3#19).This PR fills the previously empty "调试串口 / Debug Serial Port" section of the ZERO 3 hardware-interface page (ZH + EN) with:
rsetup, edit/etc/default/u-bootto setprompt/timeoutto 0, runsudo u-boot-update)Source
GitHub issue #418 referencing radxa-build/radxa-zero3#19 (comment from RadxaYuntian).
Changes
docs/zero/zero3/hardware-design/hardware-interface.md(ZH)i18n/en/docusaurus-plugin-content-docs/current/zero/zero3/hardware-design/hardware-interface.md(EN)Checklist