[PROBLEM] moOde won't start with Inno-maker HiFi DAC Pro HAT and NamedI2SDevice

[TheOldPresbyope]

@Tim Curtis 

So continuing with the booting problem I mentioned in Inno-maker HiFi DAC Pro HAT - first impressions

The problem with a Inno-maker HiFi DAC Pro HAT mounted on a Pi4B:

• moOde 8.3.2 boots and runs fine when I specify the DT Overlay to be "allo-katana-dac-audio" and reboot
  
• moOde stalls during boot---the webUI comes up but is basically catatonic---if I instead specify the NamedI2SDevice to be "Allo Katana DAC" and reboot
  

Doing some probing, I find that we're stuck at

Code:

pi@moode:~ $ systemctl is-system-running
starting

I looked at the output from systemctl and see several odd lines, notably, but not solely (with some white space removed for readibility)

Code:

 rc-local.service  loaded deactivating stop-sigterm start/etc/rc.local Compatibility
...
  getty.target      loaded inactive     dead         start Login Prompts
...
  multi-user.target loaded inactive     dead         start Multi-User System

Looking at /etc/rc,local, I discovered a potential cause of my problem

Code:

# Work around for Katana driver load failure on Pi-4B
AUDIO_DEVICE=$(sqlite3 $SQLDB "select value from cfg_system where param='i2sdevice'")
PI_REVNUM_SEGMENT=$(awk '{if ($1=="Revision") print substr($3,3,3)}' /proc/cpuinfo)

if [ "$AUDIO_DEVICE" = "Allo Katana DAC" ] && [ $PI_REVNUM_SEGMENT = "311" ]; then
    rmmod snd_soc_allo_katana_codec
    rmmod snd_soc_audio_graph_card
    modprobe snd_soc_audio_graph_card
    modprobe snd_soc_allo_katana_codec
    echo `date +'%Y%m%d %H%M%S'` "rc.local ran Katana|Pi-4B driver reload" > /var/log/moode_katana.log
fi

The if-test for this work-around should definitely trigger on my Pi4---I tried executing  the lines manually---but the log file is never written. Looks like this may be where moOde is falling down.

If I execute the lines below manually I get

Code:

root@moode:/etc#        rmmod snd_soc_allo_katana_codec
       rmmod snd_soc_audio_graph_card
       modprobe snd_soc_audio_graph_card
       modprobe snd_soc_allo_katana_codec
rmmod: ERROR: Module snd_soc_allo_katana_codec is in use

I'm not absolutely confident this is what's happening during the startup however.

If I simply comment out the work-around and reboot, moOde comes up fresh as paint and I can exercise the DAC. This is great because now, for example, the chip options are accessible via the webUI.

Any thoughts?

Regards.
Kent