Re: VCHIQ sound on Raspi4B. Which DTB to include on config.txt file, Any other missing pieces?

Reply: Fred Finster : "Re: VCHIQ sound does WORK on Raspi4B 2711 CPU chip. Which DTB to include on config.txt file, Any other missing pieces? NO"
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From: Marco Devesas Campos <devesas.campos_at_gmail.com>
Date: Tue, 06 Sep 2022 11:23:08 UTC

Hi

> On 7 Sep 2022, at 06:04, Fred Finster <fred@thegalacticzoo.com> wrote:
> 
> VCHIQ sound on Raspi4B HDMI audio.  Which DTB to include on config.txt file, Any other missing pieces?

stock confit.txt and dtb-s. 

dmesg should then show

vchiq0: <BCM2835 VCHIQ> mem 0x7e00b840-0x7e00b87b irq 72 on simplebus0
vchiq: local ver 8 (min 3), remote ver 8.
pcm0: <VCHIQ audio> on vchiq0

and 
  cat /dev/random > /dev/dsp
should play static

If nothing’s playing, flipping the sysctl dev.pcm.0.dest through
 - 0: both hdmi and headphones
 - 1: headphones
 - 2: hdmi
usually brings the audio back to life.

Best,
Marco