Embedded Linux

CS-423Dick Steflik

Desktop vs. Embedded

GUI

Lots of User Apps

Full complement of device drivers

Lots of memory

Hard drive, CD,DVD, USB, printer, mouse and keyboard support standard

No GUI

Linux kernel

Typically Busybox rather than user apps

Bootstrap Loader

Some memory

TTY support

Flash or MMC support

Embedded Distributions

UCLinux - www.uclinux.org BlueCatLinux – LynuxWorks MontaVista Linux VxWorks, Wind River Systems QNX – Quantum Systems Linux Embedded OpenMoko – FIC

Kernel Ports

X86 - www.kernel.org ARM - www.arm.linux.org.uk/developer PowerPC – penguinppc.org MIPS - www.linux-mips.org SuperH – linuxsh.sourceforge.org M68K - www.linux-m68k.org

Your Embedded System

For optimum performance you must configure your kernel for your hardware

How To Configure a Kernel http://www.faqs.org/docs/Linux-HOWTO/Kernel-HO

WTO.htm NGW100 is already configured for all of the

NGW features USB, Ethernet, SD/MMC May have to build a new kernel to add GPIO,

USARTS,I2C and LCD

Your Embedded System

In general: Only configure for the specific hardware you are

going to use You may configure options that serve your

development needs (RS-232, SPI), but in final build for production rebuild kernel with only what you absolutely need

If you may need to do updates make sure that you have a build that supports your download path

Four Main Configuration Options make config

Command line interface that asks you about each option

make oldconfig Uses an existing .config file and prompts you for

only the options not previously configured make menuconfig

Displays a curses-based configuration menu, if a .config file is present it uses it for defaults

make xconfig Displays a Tk-based X Windows GUI

AVR32 Kernel Config and Compile

http://www.avr32linux.org/twiki/bin/view/Main/CompilingTheKernel