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

Marco Devesas Campos <[email protected]> Tue, 6 Sep 2022 12:23:08 +0100

Newsgroups	gmane.os.freebsd.devel.arm
Message-ID	<[email protected]>

Hi

> On 7 Sep 2022, at 06:04, Fred Finster <[email protected]> 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