Mike Watkins <mike.watkins@...>
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Hi Jonathan, all.
I'm puzzled by your "dtoverlay=" observation as that certainly was not required on either my Pi3 or Pi4 running the same Buster image. I wonder if some of the confusion has to do with specifics of the OS you have; what updates it has received. When I first downloaded Buster it was before the DRAWS/udrc device tree files had hit; I had to perform an update before it would work.
As of today (sometime in the last month actually), that's not an issue if one downloads a Buster image from the official source: https://www.raspberrypi.org/downloads/raspbian/
In short, to get DRAWS/udrc recognized, all I did was:
1. Download and burn a new image - I've used both Raspbian Buster "Lite" as well as the full desktop image - same results.
2. While doing the initial setup of the Pi to create an empty ssh file in "boot", I also add to config.txt the famous:
# DRAWS related: # this adds the udrc driver to the device tree dtoverlay=draws,alsaname=udrc # https://www.raspberrypi.org/documentation/configuration/config-txt/overclocking.md force_turbo=1
and, to save having to change ALSA devices when running alsamixer:
# Enable audio (loads snd_bcm2835) # DRAWS: May as well disable if you don't need this # dtparam=audio=on
And boot. We're done.
aplay -l **** List of PLAYBACK Hardware Devices **** card 0: udrc [udrc], device 0: bcm2835-i2s-tlv320aic32x4-hifi tlv320aic32x4-hifi-0  Subdevices: 1 / 1 Subdevice #0: subdevice #0
The "July 10" label on Lite on the download page might not be accurate:
But it indeed is working on a Pi 3 and Pi 4. I'd recommend doing a system update in any case.
sudo apt-get update && sudo apt-get -y dist-upgrade
After reboot, on the Pi 4:
Move the same SD card to the Pi 3:
pi@raspberrypi:~ $ aplay -l
This is what we should expect.
For hams new to all this I wrote up a short guide that only goes as far as the above; configuring applications without the support of the myriad of scripts will be daunting for some. I intend to write some follow up guides for the apps I'm using (mostly packet related at this point).
On Thu, Aug 29, 2019 at 11:58 PM Jonathan Magee <jmagee@...> wrote: