Compile kernel module (sc16is7xx.c)

Hi David,

I'll look into this today. Will have an answer come tomorrow.

Thx,

Josh

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

Thank you! I hoped i had other option then this. This will be my first time to do this so i might take the opportunity to ask you.

But another question of mine. Is there any other linux distro for this board? Some more mainstream? Ubuntu, Debian, Alpine? I mean i know it is based on Debian 10.5 but i would rather use the official builds.

In theory what would it take to for example use Ubuntu?

Hi David,

The only supported systems for the MaaXBoard/Mini are Yocto / Debian Linux and Android 9.0

Link to Yocto Sources -https://github.com/Avnet/meta-maaxboard

I would reccomend you avoid using another distro from a support standpoint, a significant amount of effort went into the development of the MaaXBoard/Mini specific libraries in each distribution supported. This would need to be created from scratch by you if you wanted for instance to use somthing besides Debian/Yocto/Android.

If you wanted to use the official Debian release as mentioned above, you may be able to port the MaaXBoard specific files from the current Debian build. However support from our side would be quite limited.

-Josh

I will probably stick with it then. Just these because these chinese it looked some too costume.  Thank you.

If i get it right. Yocto project is aims to generate configure files to the kernel to be compatible with embedded systems?

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.

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?

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

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.