No sound via SPDIF

**Device Information | 设备信息**
 - SOC:  Amlogic S905x3
 - Model: Vontar X3

**Armbian Version: 25.2.3
 - Kernel Version: 6.6.50-ophub
 - Release: bookworm
 - meson-sm1-hk1box-vontar-x3.dtb

**Describe the bug | 问题描述**

I have this tv-box and I only have sound via hdmi.
SPDIF output does not work.
What should I do to make SPDIF work because I really want it.
Please help.


