Hi Federico,
On 5/23/24 5:03 PM, Federico via lists.yoctoproject.org wrote:
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Hello, I'm new to the Yocto and Raspberry community, so let me know if I'm
doing something wrong please.
I am trying to compile with Yocto Kirkstone (also tried newer branches), for a
Raspberry Pi CM4 (emmc) + Official IO Board. I chose the Raspberrypi4 machine
config, is this the correct one for the CM4 32bits?
I just build the core-image-base with the alsa package. I enabled in local.conf
dtparam=audio=on and also dtoverlay=audremap to route the audio to pins 12 and
13 (pwm).
This works fine with the official raspberry distro (only Bullseye onwards) but
it doesn't work here. With the aplay -L command only the HDMI audio appears,
not the headphones.
The SO image works fine, it boots and outputs audio via HDMI.
I also tried enabling pwm audio with other commands in local.conf like:
audio_pwm_mode2
dtoverlay=audremap, pins_12_13
dtoverlay=pwm1
and the same above with pins 40 & 41
I assume when you say local.conf you mean the one in the build
directory? build/conf/local.conf? If so, this is used by BitBake and
interpreted as BitBake code, so this is just creating a new variable
called dtoverlay and setting it to pwm1. If something makes use of that
variable... who knows! So, this isn't the place to put this code.
I think, what you want is what's described here:
https://meta-raspberrypi.readthedocs.io/en/latest/extra-build-config.html#manual-additions-to-config-txt
Cheers,
Quentin
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