I have a working Linux beaglebone 4.4.68-ti-r110 #1 SMP Wed Jun 21 04:31:35 
UTC 2017 armv7l GNU/Linux
that does not use connman (uses /etc/network/interfaces) and successfully 
executes a boot script in init.d on a BBB.
When I try the same on a BBBW where connman is the only boot option, the 
script will not execute correctly. Connman is OK since it preserves 
ifconfig settings
and I do want to switch to the BBBW for commercial reasons.

I ran the latest update. The BBB works with these settings in boot/uEnv.txt:

##BeagleBone Black: HDMI (Audio/Video) disabled:
dtb=am335x-boneblack-emmc-overlay.dtb
##Example v4.1.x
cape_disable=bone_capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN
cape_enable=bone_capemgr.enable_partno=cape-universal

If I use these settings in the BBBW it will not boot at all - it just 
bricks.

The problem centers on this line in the boot script:

sudo bash -c 'echo 1 > /sys/class/pwm/pwmchip4/export'

which will run on the BBB but not on the BBBW, unless I run the script 
manually once I get a login. Won't run in /etc/rc.local either.

An idea on what I'm doing wrong would be appreciated.

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