Problems setting up cape manager device tree overlay

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1

I have previously set up the device tree overlay for UART with no problems using Debian Version 7x. In short, I compiled a device tree source file into a .dtbo file, and then loaded the overlay .dtbo file using the following:
echo BB-UART2 > /sys/devices/bone_capemgr.*/slots // this works for debian version 7x and earlier

It appears Debian version 8x has changed this location slightly and now is /sys/devices/platform/bone_capemgr/slots.
when I compile the device tree source file and attempt to load using:
echo BB-UART2 > /sys/devices/platform/bone_capemgr/slots
I get the following response:
-bash: echo: write error: File exists

And the UART2 does not work

I would like to know what I should be doing in Debian 8x to get this working.

Thanks

2

You may be running into an issue with cape-universal and/or u-boot overlays.

Please paste the contents of:
/sys/devices/platform/bone_capemgr/slots

/boot/uEnv.txt
/etc/dogtag
/etc/debian_version

There should also be this script to print out more system version info:
/opt/scripts/tool/version.sh

(I’m typing from memory on my phone so I may have typos in the above paths)

Thanks,
Drew

3

Drew,

Here is the information you requested:
Contents of file slots located in /sys/devices/platform/bone_capemgr

0: PF---- -1
1: PF---- -1
2: PF---- -1
3: PF---- -1
4: P-O-L- 0 Override Board Name,00A0,Override Manuf,cape-universaln

Contents of file uEnv.txt in /boot

#Docs: http://elinux.org/Beagleboard:U-boot_partitioning_layout_2.0
uname_r=4.1.13-ti-r30
##uuid=
#dtb=
##BeagleBone Black/Green dtb’s for v4.1.x (BeagleBone White just works…)
##BeagleBone Black: HDMI (Audio/Video) disabled:
#dtb=am335x-boneblack-emmc-overlay.dtb
##BeagleBone Black: eMMC disabled:
#dtb=am335x-boneblack-hdmi-overlay.dtb
##BeagleBone Black: HDMI Audio/eMMC disabled:
#dtb=am335x-boneblack-nhdmi-overlay.dtb
##BeagleBone Black: HDMI (Audio/Video)/eMMC disabled:
#dtb=am335x-boneblack-overlay.dtb
##BeagleBone Black: wl1835
#dtb=am335x-boneblack-wl1835mod.dtb
##BeagleBone Black: replicape
#dtb=am335x-boneblack-replicape.dtb
##BeagleBone Green: eMMC disabled
#dtb=am335x-bonegreen-overlay.dtb
cmdline=coherent_pool=1M quiet cape_universal=enable
#In the event of edid real failures, uncomment this next line:
#cmdline=coherent_pool=1M quiet cape_universal=enable video=HDMI-A-1:1024x768@60e
##Example v3.8.x
#cape_disable=capemgr.disable_partno=
#cape_enable=capemgr.enable_partno=
##Example v4.1.x
#cape_disable=bone_capemgr.disable_partno=
#cape_enable=bone_capemgr.enable_partno=
##Disable HDMI/eMMC (v3.8.x)
#cape_disable=capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN,BB-BONE-EMMC-2G
##Disable HDMI (v3.8.x)
#cape_disable=capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN
##Disable eMMC (v3.8.x)
#cape_disable=capemgr.disable_partno=BB-BONE-EMMC-2G
##Audio Cape (needs HDMI Audio disabled) (v3.8.x)
#cape_disable=capemgr.disable_partno=BB-BONELT-HDMI
#cape_enable=capemgr.enable_partno=BB-BONE-AUDI-02

##enable Generic eMMC Flasher:
#cmdline=init=/opt/scripts/tools/eMMC/init-eMMC-flasher-v3.sh
uuid=fc2e7ab3-b253-42cf-8243-bfb98707a236

Contents of file dogtag in /etc

BeagleBoard.org Debian Image 2015-11-15

Contents of file debian_version in /etc
8.2