v4.1.x + overlay migration notes...

[RobertCNelson]

linux repo: https://github.com/beagleboard/linux/tree/4.1
overlay repo: https://github.com/beagleboard/bb.org-overlays

slots:

/sys/devices/platform/bone_capemgr/slots

enable/disable cmdline:

bone_capemgr.enable_partno=
bone_capemgr.disable_partno=

uart:

target = <&uart(X)>; = target = <&uart(X-1)>;

edit 1: module name: beaglebone_capemgr -> bone_capemgr

[tdicola]

Oh cool, is that the new mainline support for the bone capemanager with dynamic device tree overlays? Thanks for the heads up as we'll likely need to make some changes to support it.

Do you have a BBB Debian version with the 4.1 kernel support yet to start testing it out with? :)

[RobertCNelson]

Hi Tony,

Trying to get a *.deb out, but we need to upgrade gcc on:
http://builds.beagleboard.org/builders/build-kernel

I'll post a test *.deb later tonight.

But, v4.1.0-rc3 this weekend will default to it and be in the repo.

btw, feel free to fork the overlay repo and add your guy's *.dts's i'm going to be having that repo installed by default on the bb.org images..

Regards,

[RobertCNelson]

Correct, this is the "new" capemgr panto has been working on getting mainline:

https://github.com/pantoniou/linux-beagle-track-mainline/commits/bbb-overlays

Regards,

[tdicola]

Awesome, thanks for all the work as always to make the latest releases available! Just curious too, is there any timeline for when you might switch to this 4.1-based kernel as the 'official' Debian release for BBB users? Want to make sure we can get the fixes in, etc. for it.

[RobertCNelson]

I'd say, just as soon as we test/confrm all these capes:

https://github.com/beagleboard/devicetree-source/tree/master/arch/arm/boot/dts

I've got a lot of them, for some I'll be hitting up ebay! But I'm trying to get the bb.org community and all downstream v3.8.x users involved.. That way when we switch, everything works 100%! The lcd's are still going to be a pain thou.

Regards,

[ivanchou0826]

Adafruit-BBIO==0.0.30 support the latest kernel of 4.1.0-rc7-bone7

when I try to use ADC utility, the following error popups, but GPIO utility of the library is okay.
anything wrong?

import Adafruit_BBIO.ADC as ADC
ADC.setup()
Traceback (most recent call last):
File "", line 1, in
RuntimeError: Unable to setup ADC system. Possible causes are:

• A cape with a conflicting pin mapping is loaded
• A device tree object is loaded that uses the same name for a fragment: helper

I update the latest kernel, and install bb.org-overlays. I enable ADC in uEnv.txt by

optargs=dtb=am335x-boneblack-overlay.dtb
optargs=bone_capemgr.enable_partno=BB-ADC bone_capemgr.disable_partno==BB-BONELT-HDMI,BB-BONELT-HDMIN

My kernel message about capemgr is the following. Related ADC sysfs is available at
/sys/bus/iio/devices/iio:device0/
I can get adc value by reading the path ( cat /sys/bus/iio/devices/iio:device0/in_voltage1_raw), but using adafruit-beaglebone-io-python does not work~~

root@beaglebone:~/python# dmesg | grep capemgr
[ 0.000000] Kernel command line: console=tty0 console=ttyO0,115200n8 bone_capemgr.enable_partno=BB-ADC bone_capemgr.disable_partno==BB-BONELT-HDMI,BB-BONELT-HDMIN root=UUID=9e07e85d-795b-4480-ad05-8258e4a23995 ro rootfstype=ext4 rootwait fixrtc quiet init=/lib/systemd/systemd
[ 3.237676] bone_capemgr bone_capemgr: Baseboard: 'A335BNLT,00C0,3214BBBK1346'
[ 3.237696] bone_capemgr bone_capemgr: compatible-baseboard=ti,beaglebone-black
[ 3.292912] bone_capemgr bone_capemgr: slot #0: No cape found
[ 3.352912] bone_capemgr bone_capemgr: slot #1: No cape found
[ 3.412909] bone_capemgr bone_capemgr: slot #2: No cape found
[ 3.472908] bone_capemgr bone_capemgr: slot #3: No cape found
[ 3.478930] bone_capemgr bone_capemgr: enabled_partno PARTNO 'BB-ADC' VER 'N/A' PR '0'
[ 3.478941] bone_capemgr bone_capemgr: slot #4: override
[ 3.478954] bone_capemgr bone_capemgr: Using override eeprom data at slot 4
[ 3.478968] bone_capemgr bone_capemgr: slot #4: 'Override Board Name,00A0,Override Manuf,BB-ADC'
[ 3.479220] bone_capemgr bone_capemgr: initialized OK.
[ 3.495394] bone_capemgr bone_capemgr: slot #4: dtbo 'BB-ADC-00A0.dtbo' loaded; overlay id #0

[shaunmulligan]

Is there any update on this? I would be very interested in this and willing to help where I can, even if its just to help testing.

[mgaggero]

I had the same issue. The problem seems to lie in the way Adafruit-BBIO library tries to access the adc devices using the old 3.8.x kernels device tree. Few months ago I've submitted a pull request for a patched version of Adafruit-BBIO library that works with the new >=3.14 device tree structure, but so far I've not received any comments. It's just a starting point and it needs further development.

[grizmio]

Maybe it's too late, it has been months since this thread started, but it could help someone like me when i came here the first time.
I'm using https://github.com/adafruit/adafruit-beaglebone-io-python libraries with ubuntu xenial with kernel 4.1.12-ti-r29
and to get ADC working i used this uglies patches:
https://gist.github.com/grizmio/bc752dd070652f21266b#file-gistfile1-txt

Then:
python -c "import Adafruit_BBIO.ADC as ADC;ADC.setup();value=ADC.read_raw('P9_40');print(value)"
3070.0
python -c "import Adafruit_BBIO.ADC as ADC;ADC.setup();value=ADC.read('P9_40');print(value)"
1.73000001907

Seems to work :-)

[iandow]

I'm also having trouble using Adafruit_BBIO on a beagleboneblack running Ubuntu 14.04.3 and kernel 4.1.12. That patch you referenced looks helpful, but does it require that I recompile my kernel?

Seem strange that I would need to patch and recompile my kernel just to get basic I/O to work. Might be easier just to revert to default Angstrom, since I don't have a kernel development environment setup.

[grizmio]

@iandow
There's no need to recompile the kernel, you could just download this repo, apply the changes and then run python setup.py install
Newer kernel versions use different device file paths, so i just fixed those paths, but this just fix ADC support maybe even broking PWM, so PWM should need copy/paste some patch code to get it works too.
But if you see @shaunmulligan fix, you will notice he also change in py_adc.c the scale to:
value = value / 4095.0;
but i dont know why

[mattmp]

How do I apply this patch?

[grizmio]

Right now i dont have my laptop but if i remeber correctly its something líke
git apply patch_file
Or you can get the repo from @mgaggero

[spmaniato]

How do I apply this patch?

Concise instructions (starting from scratch) for people landing here from other issues / webpages:

git clone https://github.com/adafruit/adafruit-beaglebone-io-python.git
cd adafruit-beaglebone-io-python
wget https://gist.githubusercontent.com/grizmio/bc752dd070652f21266b/raw/336b5ab5ad14ef28341edfeff6cbf20d959d2f70/gistfile1.txt
git apply gistfile1.txt
sudo python setup.py install
cd ..
sudo rm -rf adafruit-beaglebone-io-python # Unless you want to keep it around ofc