docs(rock4d): note that the speaker amplifier is not populated - #2122
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Milir-Radxa merged 1 commit intoSep 20, 2026
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The ROCK 4D interface list mentions 'Speaker Reserved Pads' and the headphone page lists the related signals, but nothing states that the amplifier ICs, speaker connectors and their peripheral components are left unpopulated (NC) in production. Users therefore may try to wire a speaker to the reserved pads and get no sound. Add a note to both the Chinese and English headphone pages explaining the reserved amplifier circuit is unpopulated and listing the supported ways to use an external speaker.
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背景
ROCK 4D 的接口说明中列出了「扬声器预留焊盘 / Speaker Reserved Pads」（v1.12），headphone 页面也给出了对应的信号定义，但没有任何地方说明该功放电路出厂未贴。
实际支持场景：客户询问「ROCK 4D 板载有自带功放吗？想通过焊盘外接扬声器，接哪几个引脚？」，而按当前文档无法判断——若直接把扬声器接到预留焊盘，会因为功放芯片、喇叭座及其外围元件均为 NC（不贴）而不出声。
依据
ROCK 4D 公开原理图
24.Audio SPK页（V1.11 与 V1.12 一致）：NC/TCS7191A_MHNC/CON_TH1x2pNC/120R 2AVCC5V0_DEVICE_S0→VCC_SPK_AMP）、各滤波电容/电阻同为 NC即：预留焊盘上能取到的只有来自板载 ES8388 编解码器的
AUD_LINEOUT_L/R等模拟信号，功放输出侧（AUD_SPK1P/N、AUD_SPK2P/N）因功放未贴而悬空，无法直接驱动扬声器。改动
在 headphone 页面「接口规格」表格前增加一个
note（中英文同步）：AUD_LINEOUT_L/R取信号、自行补齐预留功放电路。仅文档改动，不涉及代码与图片资源。