Hello,

I need to get a minimal kernel runing on an embedded hardware. the machine cpu is NXP i.MX7, it should support,
I2C
USB device for micro SD Card MSD mode
micro SD card, FAT file system
4.7 LCD with LCDIF
power management
video camera with MIPI DSI
matrix keypad
GPIO
ADC
PWM

The system is set up to run qt program after power up. So I want to get a clean and minimal kernel configuration, only includes above sutffs, no network, no wifi, no bluetooth, etc, just keep the kernel as small as possible.

Can anyone having the same experience how to make it.

1) Download your kernel.
2) Unpack it in your home directory.
3) Go into the linux-x.y.z directory.
4) Run make defconfig to get a starting file for your configuration.
5) Run make menuconfig
6) Browse the menus and remove what you don't want. A lot of the stuff you mention will be in the drivers section. Use the very good built-in help to determine what is safe to remove.
7) Run make.
8) As root, run make modules_install and copy the bzImage in the arch/your_architecture tree into /boot.

lspci -v

on terminal to check, what PCI hardware support you need.

additionally build all of your required modules into the kernel (so do not use loadable modules if not needed).

Does your hardware have sound support?

I yes, then you should build the sound support (ALSA) as module.