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BPI-M1 CAN Bus

In order to port can4linux to the BananaPi, the CAN module description is needed from the A20 hardware manual. can4linux is a character-driver-based Linux driver used already on desktop PCs and embedded platforms like Freescale FlexCAN (the i.MX series of micro controllers) or Xiliny Zynq.
There is a more detailed document about CAN on the A20 at https://dl.linux-sunxi.org/A20/CAN Bus1.pdf​
This is a tutorial for using CAN BUS on bananapi with bananian 15-01
Thank selqcir share this example:
  • Download and install "bananian-1501.img" into 8 GB SDCard.
  • Expand the root file system using "bananian-config"
  • Install missing package:
    apt-get install git
    apt-get update
    apt-get upgrade
    reboot
  • Get last bananian available, and continu to install missing package:
    git clone https://github.com/Bananian/linux-bananapi
    apt-get install build-essential u-boot-tools uboot-mkimage
    apt-get install libusb-1.0-0 libusb-1.0-0-dev git wget fakeroot kernel-package zlib1g-dev libncurses5-dev
    apt-get install subversion
  • Build kernel:
    cd linux-bananapi
    make menuconfig
  • Exit without saving when menu appears
    zcat /proc/config.gz > /root/linux-bananapi/.config
    make uImage modules
    make INSTALL_MOD_PATH=output modules_install
  • At this step, kernel should be compiled and "Module.symvers" should be available
  • Then rename modules and firmware provide by Bananian, and replace by the new one.
    mv /lib/modules /lib/modules.old
    mv /lib/firmware /lib/firmware.old
    mv /root/linux-bananapi/output/lib/modules /lib/modules
    mv /root/linux-bananapi/output/lib/firmware /lib/firmware
  • Same for uImage:
    mount /dev/mmcblk0p1 /mnt
    cd /mnt
    mv uImage uImage.old
    mv /root/linux-bananapi/arch/arm/boot/uImage /mnt
    reboot
  • Create link for further build:
    cd /lib/modules/3.4.104/
    ln -s /root/linux-bananapi build
    cd ~
  • Get Can4Linux and build it:
    svn checkout https://svn.code.sf.net/p/can4linux/code/trunk can4linux-code
    cd /root/can4linux-code/can4linux/
    make TARGET=BANANAPI
  • Install module for each startup of the board:
    insmod can4linux.ko
    cp can4linux.ko /lib/modules/3.4.104/kernel/net/can/
    depmod -A -v
    modprobe -v can4linux
    echo "" >> /etc/modules ; echo "can4linux" >> /etc/modules
    reboot
  • Build CAN example
    apt-get install swig
    apt-get install python-dev
    cd can4linux-code/can4linux-examples/
  • Update CAN speed and device in file "pyCan-example.py"
    ex:
    # setting the device number
    device = 0
    defaultBaudrate = '250'
  • Connect CAN transceiver and CAN bus, and check with for example:
python pyCan-example.py
That's all
With this method, kernel version is "Linux bananapi 3.4.104" instead of "Linux bananapi 3.4.104+", because i was unable to find same sources than Bananian 15-01 , but CAN bus work !
Feel free to comment or update.
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