Thanks to zmatt on the IRC channel this got resolved.

The problem is that the am335x-boneblack-overlay.dtb does not define the 
symbol "clk_mcasp0".

So, I had to use the am335x-boneblack-audio.dtb overlay instead.


On Monday, June 26, 2017 at 1:31:27 AM UTC-7, Andrew P. Lentvorski wrote:
>
>
> I'm trying to get my own audio cape to load so I thought I would start by 
> loading the built-in audio cape configuration and then copy that to make my 
> own.  However, I can't seem to beat the cape manager into submission.  I 
> can load the BB-UART1-00A0 overlay, but I can't load the 
> BB-BONE-AUDI-02-00A0:
>
> root@beaglebone:/sys/devices/platform# echo BB-UART1 
> >/sys/devices/platform/bone_capemgr/slots
> root@beaglebone:/sys/devices/platform# echo BB-BONE-AUDI 
> >/sys/devices/platform/bone_capemgr/slots
> -bash: echo: write error: No such file or directory
> root@beaglebone:/sys/devices/platform# echo BB-BONE-AUDI-02 
> >/sys/devices/platform/bone_capemgr/slots
> -bash: echo: write error: Invalid argument
> root@beaglebone:/sys/devices/platform# cat 
> /sys/devices/platform/bone_capemgr/slots
>  0: PF----  -1 
>  1: PF----  -1 
>  2: PF----  -1 
>  3: PF----  -1 
> 14: P-O-L-   0 Override Board Name,00A0,Override Manuf,BB-UART1
>
>
>
> Any suggestions as to what I'm doing wrong?
>
> Thanks.
>
> root@beaglebone:/sys/devices/platform# uname -a
> Linux beaglebone 4.4.54-ti-r93 #1 SMP Fri Mar 17 13:08:22 UTC 2017 armv7l 
> GNU/Linux
>
>
>
>
>
>
>

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