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Compile kernel module (sc16is7xx.c)

david.bozo

Hello!

I'm looking for a way to add driver for SC16IS752 IC.

 

I want to use the Waveshare 2-CH RS232 HAT . This hat contains a SC16IS752 IC which uses SPI to communicate.

As far as i see the default image does not contains this module so i want to compile it from source: sc16is7xx.c(v4.14)

 

But i did not found the current kernel headers in /lib/modules/4.14.78/build. It points to /home/embest/compile/linux which is a not exist.

How can i achive this the most easily? Could someone point me in the right direction?

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  • Hi David,

     

    I believe that to enable the driver you'll have to compile the kernel from source using these instructions: MaaXBoard-Linux-Development_Guide-V1.0-EN.pdf

    After running "make em-sbc-imx8m_defconfig" and before running "make" in step 2.2.2 you can enable the driver in the .config file in the "linux" directory (found here: http://downloads.element14.com/downloads/zedboard/MaaxBoard/MaaXBoard-LinuxSourceCode-V1.0.6r07.rar.zip?ICID=maaxboard-d…

    I'm currently going through the same process, so reach out if you have further questions.

     

    Monica

  • in reply to zebular13

    So i tried to compile the source using the documentation but i have some new questions.

     

    1. Sometimes if a compile the source i'm getting this kind of error:

    In file included from drivers/usb/phy/phy-gpio-vbus-usb.c:14:0:./include/linux/module.h: In function ’within_module_init’:./include/linux/module.h:511:9: internal compiler error: Segmentation fault

         addr < (unsigned long)mod->init_layout.base + mod->init_layout.size;         ^~~~Please submit a full bug report,with preprocessed source if appropriate.See <https://gcc.gnu.org/bugs/> for instructions.make[3]: *** [scripts/Makefile.build:328: drivers/usb/phy/phy-gpio-vbus-usb.o] Error 1

    Have you ever got this kind of error?

    After this i start make -j8 again and it compiles successfully. Is it probably just some gcc error because it is outdated?

    I'm using the provided 'gcc-linaro-7.3.1-2018.05-x86_64_aarch64-linux-gnu'. Are you using the same too?

     

    2. As you suggested i edited the .config file after make 'em-sbc-imx8m_defconfig' but it does not compiles the kernel module:

    lbozo@lbozo-PC:~/maaxboard/01LinuxSourceCode/linux$ find . -name "*sc16is7*"
./drivers/tty/serial/sc16is7xx.o
./drivers/tty/serial/.sc16is7xx.o.cmd
./drivers/tty/serial/sc16is7xx.c
./include/config/serial/sc16is7xx
./include/config/serial/sc16is7xx.h
./Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt

    I looked for it in the output folder too after:  'make modules_install INSTALL_MOD_PATH=~/output/modules/'

    But i did not found it.

    Sure is this the right way to enable this module? I tried to find other ways like make config, make menuconfig but not sure i can use them and i didnt even find the module in the menu.

    Edit (solution):

    I found the solution for the 2. question. If someone needs the solution:

    By editing the .config file with:

    'CONFIG_SERIAL_SC16IS7XX=y'

    I probably just statically linked it into the kernel. I used make xconfig GUI to configure. If the checkbox is checked (✓) it will compile it statically. If it is a dot (•) then it will create a kernel module.

  • in reply to david.bozo

    I'm trying  to understand how this device tree works and how to configure an overlay to load /dev/ttySCx for that Waveshare 2-CH RS232 HAT .

    But so far no luck. I found the overlay for Raspberry: https://github.com/raspberrypi/linux/blob/rpi-5.4.y/arch/arm/boot/dts/overlays/sc16is752-spi1-overlay.dts

    But i have no idea how to port it.

    Can someone help me out with a dts code please?

  • in reply to david.bozo

    Hi David,

     

    For number 1 is this an intermittent issue your having? The GCC compiler we used was gcc-linaro-7.3.1-2018.05-x86_64_aarch64-linux-gnu. So it looks like we are using the same. Please note you can find all the linux build resources located under reference designs -> Linux tools section.

     

    I'll try to get some feedback for you on the dts code help come monday.

     

    -Josh

  • in reply to jafoste4

    Yes it was intermittent since then i don't have any problem with the compilation process.

    First time i downloaded the cross compiler from here: https://releases.linaro.org/components/toolchain/binaries/7.3-2018.05/aarch64-linux-gnu/

    Maybe that was the problem not sure. But i did not meet with the error.

     

    Thank you. Im looking forward ti it.

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