VAR-SOM-MX6 Ubuntu Customize linux-variscite

VAR-SOM-MX6 - Customize linux-variscite

Note:
Under Construction

Overview

Ubuntu Linaro Alip is pre built file system. For more information Ubuntu based Rootfs provided by Linaro. Variscite used linaro-vivid-alip-20151215-714 image added Vivante Graphic acceleration and compile the GStreamer with i.MX6 support.

Build Ubuntu Alip NFS is prerequisite step. Please make sure you run it and have a complete NFS build directory as described in the linked WIKI. Also make sure you target is booted from NFS. We deliver a complete Linux in source code adopted to our development platforms. Our customers may require additional changes. You can change and adopt the Linux kernel and/or the device tree's to your requirements.

Linux Changes

$ cd ~/var-som-mx6-alip
$ export PATH=/opt/gcc-linaro-arm-linux-gnueabihf-4.9-2014.05_linux/bin/:$PATH

Make your kernel changes and test them. Most of the changes will be in Linux kernel configuration. For example:

Add a printer gadget
$ make -j6 ARCH=arm CROSS_COMPILE=aarm-linux-gnueabihf- menuconfig

Changes made:

 diff .config arch/arm/configs/imx_v7_var_ubuntu_defconfig 
3359c3359
< CONFIG_USB_G_PRINTER=m
---
> # CONFIG_USB_G_PRINTER is not set

Create a new config file

$ cp .config arch/arm/configs/imx_v7_var_custom_defconfig 
$ git status
On branch imx_3.14.38_6qp_ga_var01
Untracked files:
  (use "git add <file>..." to include in what will be committed)

	arch/arm/configs/imx_v7_var_custom_defconfig

nothing added to commit but untracked files present (use "git add" to track)
$ git add arch/arm/configs/imx_v7_var_custom_defconfig
$ git commit -a -m "Custom"

Build and run the system

On target:

root@var-som-mx6:~# find /lib/modules/ -name *.ko | grep print
/lib/modules/3.14.38-6QP+g5b28091/kernel/drivers/usb/gadget/g_printer.ko