Boards with proper support for HDMI eARC

General Discussion
1

Hi All,

Is there any khadas board that has functioanl software support for hdmi earc as of now?
i know vim4 and vim3l have hardware support, but it’s not clear if the kernel support is there to make use of it.

Thanks!

2

Hello, in the dts configuration, I found the following corresponding configurations, I hope this information can help you
I will continue to look for information related to Amlogic and earc

vim4 dts configuration：

common\arch\arm64\boot\dts\amlogic\kvim4.dts

&earc {
	status = "disabled";
};

vim3l dts configuration：

common\arch\arm64\boot\dts\amlogic\kvim3l.dts

&earc {
	status = "okay";
};
3

Thanks!

Were you able to find any confirmation on this?

4

Hi @Catalin_Adler @xiong.zhang did you ever have any luck in getting earc working on vim4?

5

From what I can tell, the VIM3L is actually the better-documented case here – the S905D3 had some eARC code in the vendor 4.9 kernel but it was never finished enough to actually use. VIM4 looks to be in the same boat. Dug into this a bit more at HDMI eARC on Khadas VIM4 and VIM3L: Where Kernel Support Actually Stands - Port & Patch if you want the longer version.