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How to use I2C device at EXPANSION CONNECTOR on Ubuntu Linux

Questions and discussions related to Inforce 6410Plus

by Shinichi » Mon Jun 25, 2018 2:30 am

I want to use I2C device at EXPANSION CONNECTOR (Pin14: I2C2_CLK, Pin12: I2C2_DATA) of Inforce 6410Plus.
However, the I2C signal is not output.

I am looking at the Users Guide 002494 Rev C (July 7, 2017) I downloaded from Inforce TechWeb.

I checked the I2C output with i2c-tools.

linaro@linaro-gnome:~$ sudo i2cdetect -l
i2c-0 i2c QUP I2C adapter I2C adapter
i2c-4 i2c QUP I2C adapter I2C adapter
i2c-6 i2c msm hdmi i2c I2C adapter
i2c-7 i2c i2c-gpio7 I2C adapter

I input the following command and checked the output of I2C2_CLK (EXPANSION CONNECTOR Pin 14) with an oscilloscope.

linaro@linaro-gnome:~$ sudo i2cdetect -y -r 0
linaro@linaro-gnome:~$ sudo i2cdetect -y -r 4
linaro@linaro-gnome:~$ sudo i2cdetect -y -r 6
linaro@linaro-gnome:~$ sudo i2cdetect -y -r 7

However, can't observe the i2c signal.

Please tell me how to make i2c available.

In addition, the OS uses the one which built IFC by the following procedure.

Cross Build OS: Ubuntu16.04 32bit

step 1) get kernel source
Select [SUPPORT]-[TECHWEB] & Login to Inforce TechWeb
Select "INFORCE 6410 PLUS" Product
Click "Inforce 6410P Ubuntu Linux BSP"
Get ""

step 2) make kernel
mkdir Ubuntu_Linux
cd Ubuntu_Linux
copy ""
cd source
git clone ubuntu-ifc6410p-14.10_1.bundle ubuntu-ifc6410p-14.10 -b ubuntu-SYS6410p-14.10
tar -xvf gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux.tar.bz2
cd ubuntu-ifc6410p-14.10

/kernel/ line 373.
Change from: if (!defined(@val)) {
Change to: if (!@val) {

mkdir ../install
alias kmake='make CROSS_COMPILE=$TC ARCH=arm INSTALL_MOD_PATH=../install'
kmake clean ifc6410p_defconfig
kmake zImage modules modules_install firmware_install

step 3) generate boot imgge
copy from "../install/lib/*.*" to "lib/"
abootimg --create linaro_6410p_boot.img -k arch/arm/boot/zImage -f ../bootimg.cfg -r ../initrd.img-3.4.0-linaro-ifc6410p

step 4) flash image
sudo fastboot flash cache ../../binaries/firmware-ifc6410p-20141024-37.img
sudo fastboot flash boot linaro_6410p_boot.img
sudo fastboot flash -S 768M userdata ../../binaries/linaro-trusty-gnome-ifc6410p-20141024-37.img
sudo fastboot reboot
Posts: 2
Joined: Wed Jun 13, 2018 11:01 pm

by ashwin » Fri Jul 20, 2018 3:43 am

Hi Shinichi,

please refer the GSBI programming guide(APQ8064 AppNote Configure GSBI Port Android Kernel) available on your techweb account.
Posts: 66
Joined: Wed Jul 01, 2015 10:07 pm

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