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Honored Contributor I
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Altera Linux - How to configure CAN bus?

Hi, 

 

I am working with Altera Linux on a cyclone 5 development board. I am trying to enable the CAN bus and send a message. 

 

When I try to turn on the CAN bus, I get: 

 

root@socfpga_cyclone5:/etc# ip link set can0 up type can bitrate 125000 ip: either "dev" is duplicate, or "type" is garbage 

 

 

Is there a different way to setup the CAN bus than what I am doing? How do you do this? I have read online there is a iproute2 that has support for setting up the CAN bus. I am having trouble including this in the rootfs. 

 

It just seems to me there is CAN support in the released Altera Linux, but I am not able to start it. 

 

A little more info: 

root@socfpga_cyclone5:/etc# uname -a Linux socfpga_cyclone5 3.11.0-00406-g9c73c70-dirty# 1 SMP Wed Oct 30 10:06:30 CDT 2013 armv7l GNU/Linux root@socfpga_cyclone5:/etc# which ip /bin/ip  

 

Thanks, 

John
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Honored Contributor I
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All, 

 

I figured out how to get the CAN bus working. I thought I would just share here in case anyone else runs into this question and might find this helpful: 

 

1. Download the 13.1 binaries for Altera Linux 

http://software.altera.com/linux_socfpga/0dcda22e23aa08c250fb3446daf36231/?version=13.1cb 

 

Follow this guide and make sure default release works on development board 

http://rocketboards.org/foswiki/documentation/gsrdbootlinuxsd 

 

 

2. Download 3.11 kernel and compile. This is needed for CAN support. If you have not set up the compiler, see this for reference. http://rocketboards.org/foswiki/documentation/gitgettingstarted 

cd ~ git clone http://git.rocketboards.org/linux-socfpga.git cd linux-socfpga git checkout -b socfpga-3.11 origin/socfpga-3.11 export CROSS_COMPILE=~/gcc-linaro-arm-linux-gnueabihf-4.7-2012.11-20121123_linux/bin/arm-linux-gnueabihf- make ARCH=arm socfpga_defconfig make ARCH=arm uImage LOADADDR=0x8000 make ARCH=arm dtbs make ARCH=arm modules 

 

Once the kernel finishes building, mount the sd card partition 1 and update the kernel. 

cd ~/linux-socfpga/arch/arm/boot cp zImage sdcard/zImage cp dts/socfpga_cyclone5.dtb sdcard/socfpga.dtb  

Verify development board boots and test the kernel version by uname -a 

You should also see the can bus if you type: ip link show 

 

 

3. Download Yocto to build the new rootfs. This is needed to add the iproute2 to enable the CAN bus. 

http://rocketboards.org/foswiki/documentation/gsrdgettingstartedyocto 

 

Add the following line to ~/yocto/build/conf/local.conf 

IMAGE_INSTALL_append = " iproute2" 

 

You will want to build the rootfs by: 

bitbake altera-gsrd-image 

 

Look in ~/yocto/build/tmp/deploy/images to find the rootfs. Use a linux machine to dd this to the 2nd partition on the sd card. 

 

cd ~/yocto/build/tmp/deploy/images dd if=altera-image-socfpga_cyclone5.ext3 of=/dev/sdx2 

 

4. Connect to the development board through the usb/serial port. You should now have the right "ip" 

 

Initialize the can0: 

 

ip link set can0 up type can bitrate 125000 ifconfig can0 up 

 

Helpful reference 

http://www.armadeus.com/wiki/index.php?title=can_bus_linux_driver 

 

Now that the can bus is up and running, I am following an example like the following to send messages.  

http://en.wikipedia.org/wiki/socketcan 

 

 

There may be a better way going about all this. Let me know if there is. 

 

John
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Honored Contributor I
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Thanks for laying out the steps - it is very useful. 

 

A new tutorial for setting up linux can on the cyclone5 (https://rocketboards.org/foswiki/documentation/linuxcanbusonthecyclone5) was recently added to the Rocketboards.org website. The tutorial discusses the setup of the device tree and the Linux configuration for CAN support - specifically for the Cyclone5 Development Kit board. 

 

It can be found at 

https://rocketboards.org/foswiki/documentation/linuxcanbusonthecyclone5
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Honored Contributor I
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--- Quote Start ---  

Thanks for laying out the steps - it is very useful. 

 

A new tutorial for setting up linux can on the cyclone5 (https://rocketboards.org/foswiki/documentation/linuxcanbusonthecyclone5) was recently added to the Rocketboards.org website. The tutorial discusses the setup of the device tree and the Linux configuration for CAN support - specifically for the Cyclone5 Development Kit board. 

 

It can be found at 

https://rocketboards.org/foswiki/documentation/linuxcanbusonthecyclone5 

--- Quote End ---  

 

 

Hey,  

I followed the steps given in the RocketBoards website. While at step 3, when I type this command in the terminal -  

 

$ git checkout -b linux-socfpga-can-4.1.33ltsi origin/socfpga-4.1.33-ltsi 

 

I am getting the Error message: 

 

fatal: Not a git repository (or any of the parent directories): .git 

Has the files been shifted or a newer version available?
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