[Alsa-user] MEMS mic array with beaglebone green

[Manuel P. <man...@st...>]

Hello List,

This is an update on my previous question. My goal is to successfully
load a Device Tree Overlay which uses the McASP audio on the beaglebone
green at runtime to modify it for my project.
I can now load DTOs at runtime on Beaglebone Green(debian with kernel
4.14.108-ti-r113 booted from SD-card) via commenting
"enable_uboot_overlays=1" in /boot/uEnv.txt, which gives me the slots
file of the bone_capemgr in "/sys/devices/platform/bone_capemgr/slots".
With "echo DTO-name > slots" as root, the "BB-I2C1" DTO can be loaded
successfully, but the "BB-CTAG-SW-8CH" DTO cannot be loaded, which uses
McASP like I want to do and is in the official beaglebone sources.
I tried to find how to interpret the error messages I get from demesg
when trying to load this DTO, but I got no useful hints. Can I get a
pointer how to understand this demesg output?

    root@beaglebone:/sys/devices/platform/bone_capemgr# echo
BB-CTAG-SW-8CH > slots
    bash: echo: write error: Invalid argument

    dmesg -wH output:
    [Aug 4 02:14] bone_capemgr bone_capemgr: part_number
'BB-CTAG-SW-8CH', version 'N/A'
    [  +0.000031] bone_capemgr bone_capemgr: slot #4: override
    [  +0.000014] bone_capemgr bone_capemgr: Using override eeprom data
at slot 4
    [  +0.000015] bone_capemgr bone_capemgr: slot #4: 'Override Board
Name,00A0,Override Manuf,BB-CTAG-SW-8CH'
    [  +0.009153] OF: resolver: overlay phandle fixup failed: -22
    [  +0.011567] bone_capemgr bone_capemgr: slot #4: Failed to resolve
tree


Regards,
Manuel