1. Embedded Linux CS-423 Dick Steflik

2. 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

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

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

5. 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- HOWTO.htm http://www.faqs.org/docs/Linux-HOWTO/Kernel- HOWTO.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

6. 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

7. 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

8. AVR32 Kernel Config and Compile http://www.avr32linux.org/twiki/bin/view/Main/CompilingTheKernel