Linux/BEAGLEBK: 1-wire access

Also take a look at the linked below article which gives you an example for device tree configuration in addition:
www.bonebrews.com/.../

BR
Tsvetolin Shulev

Hi Tsvetolin,
thanks for the hint. Some time ago I used it in Debian environment, worked fine.
But now I have to recompile the kernel ... on BeagleBone. Will take some time, but that's not an issue as long it works.
Pepito

Part Number: BEAGLEBK

Tool/software: Linux

Because I have to develop on BeagleBone, I have to compile the kernel on it

to get access for 1-wire bus.

Question is: how to do that on beaglebone?

Or is already an image available with 1-wire support?

I did think that 1-wire is a kernel module and it's possible to load/unload at run time ( modeprobe / rmmod ).

 Pepito

modprobe w1-gpio
modprobe: FATAL: Module w1-gpio not found in directory /lib/modules/4.9.69-g9ce43c71ae
Hi Tsvetolin,
the module is not existing.
I'm trying to compile the kernel, make menuconfig works,
was not enabled.
Would like to start kernel compilation from ti default, did not work.

make ARCH=arm distclean
ti_config_fragments/defconfig_builder.sh -t ti_sdk_am3x_release
mktemp: Invalid argument
mktemp: Invalid argument
mktemp: Invalid argument
cp: invalid option -- 'T'
BusyBox v1.24.1 (2018-03-26 13:29:31 EDT) multi-call binary.

Usage: cp [OPTIONS] SOURCE... DEST
Creating defconfig file /home/ln/Programme/processor-sdk-processor-sdk-linux/arch/arm/configs/ti_sdk_am3x_release_defconfig
mv: can't rename '.config': No such file or directory
am335x-evm:/home/ln/Programme/processor-sdk-processor-sdk-linux#

ls -als /home/ln/Programme/processor-sdk-processor-sdk-linux/arch/arm/configs/ti_sdk_am3x_release_defconfig
ls: /home/ln/Programme/processor-sdk-processor-sdk-linux/arch/arm/configs/ti_sdk_am3x_release_defconfig: No such file or directory

Think I need this starting point. Then I can select the 1-wire module in make menuconfig and compile afterwards.

What do you think?

Pepito

Yes, if "Dallas's 1-wire support" is not enabled by default in your config enable it.

BR
Tsvetolin Shulev

Hi Tsvetolin,
I'm unable to generate the TI default .config file. Is it possible to provide a default ".config" for BeagleBone black ( C release )?
ti_config_fragments/defconfig_builder.sh -t ti_sdk_am3x_release
fails
Or is the any other way to start make menuconfig from defaults?
There are so many possibilities ..... think it good idea to start from factory defaults and add then specific functionality like 1-wire, AD etc.
Pepito

You should use command:
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- menuconfig
as it is described at the linked below guide (only for clarification the command must be executed on an Ubuntu host PC):
software-dl.ti.com/.../Foundational_Components.html

BR
Tsvetolin Shulev

Hi Tsvetolin,
I don't have access to Ubuntu. We have only Suse installed. But .... right now I was able to generate the default .config on Suse PC.
ti_config_fragments/defconfig_builder.sh -t ti_sdk_am3x_release worked fine
I copied the .cofig via scp to BeagleBone and execute make menuconfig.
The 1-wire is enabled as module. The is a sub group for master and slaves, which module is required for 1-wire Dallas temp sensors?

I start make zimage, just to see if it works ... up to now it's working.

Thanks
Pepito