b ildi b dd d di l d ibuilding an embedded medical device ......b ildi b dd d di l d ibuilding an...

B ildi b dd d di l d iBuilding an embedded medical device using the Texas Instruments Zoom™

OMAP35x Development Kit from LogicOMAP35x Development Kit from Logic

Webinar SeriesWebinar Series

Project fast track – development

Session 1

Project fast track development environment and small footprint

Linux platform for the OMAP-3530

We will start our webinar in few minutes.Thank you for your patience

www.timesys.com ©2009 TimeSys Corp.

2 Series Overview

Session 1 – todayProject fast track – development environment and Project fast track development environment and small footprint Linux platform for the OMAP-3530

Session 2 – September 15, 2009 11:30am ESTEKG device—meeting application requirements and objectives through rapid development with LinuxLinkobjectives through rapid development with LinuxLinkand open source middleware

Session 3 – September 29, 2009 11:30am ESTSystem debugging and testing with the OMAP35x


3 Agenda – Session 1

Introduction

Design your own development environment - Assemble a small footprint Linux platform with the Factory Web Wizard

Install the dev environment including Desktop Factory tools on a Linux host

Footprint optimization techniques

Using Desktop Factory we will do the following:• Verify if any updates are available• Modify the kernel for fast booting• Root filesystem adjustments


Deploy the images on the OMAP35x board

4 An Introduction to Timesysy

The Company• Founded in 1996 Carnegie MellonFounded in 1996, Carnegie Mellon• Headquarters in Pittsburgh, PA

The History The History • First real-time Linux distribution• Open-sourced in 2005• Launched LinuxLink• Launched LinuxLink

LinuxLink — A framework for Linux developmentG t i iti l Li l tf f gi d l t kit• Great initial Linux platform for a given development kit

• Suite of scriptable tools to configure, customize, build, and test• Access to man-years of embedded Linux expertise & best practices

M d t l i d• Moderately priced

Open source friendly — no monkey business


5 Why Pay for Linux — Isn’t it Free?

Assembling a Linux platform can be very complex• The code is “free,” but…

y y

,• Achieving a consistent and repeatable build can be challenging

Difficult to keep paceDifficult to keep pace• Over 40,000 independent sources on the Web• Maintained by thousands of developers

Difficult to pick the right combinations• Hidden dependencies, abandoned projects

N i i fli t• Numerous revision conflicts

Difficult to find tools that work• Many open source tools are available• Difficult to assemble the associated patches and libraries


Limited-to-no support

6 LinuxLink Reduces the Complexity of Open Source p y pLinux Development via a Unique Framework

Quickly build an initial platform via the WebQuickly build an initial platform via the Web• Select a Timesys developed starting point or build

your own with the Online Factory

Customize via a properly installed, configured and tested desktop environment• Patch/configure/build with Desktop FactoryPatch/configure/build with Desktop Factory• Debug/profile/trace/tune with Toolbox• Scriptable

Obtain help with common development tasks• Technical Assistance, “How-to” documentation

Maintain alignment with the community• Obtain updates/alerts/advice that are

relevant to your embedded Linux platform


relevant to your embedded Linux platform

7 LinuxLink Software Development FrameworkThe complete environment for developing your Linux-based product.

Linux Kernel• Latest open-source kernels• Several architectures• Extensive SoC support

Support• Web-based• In-person• Learning center

Updates• Automatic kernel updates• Automatic middleware updates• Web-based & desktop notifications

Development Tools• Latest versions of gcc, glibc• Tested on all supported SoCs

Your custom tools/ db

pp• Eclipse-based environment

MiddlewareRi h l ti f k

Factory• Interactive step-by-step wizard• Guides your selection of packages• Builds your custom kernel & tools

• gcc / gdb• Eclipse-based framework

Your custom image• Kernel

• Rich selection of packages• Networking, industrial, consumer• Pre-built, tested and verified

Ready to run on your hardwareG id

• Root file system

Boot loader• For supported reference platforms• Industry-standard U-Boot• Latest open-source code base

your hardwareGuides• “How-to” documents• Extensive Linux information• Knowledge base


LinuxLink – Open Source made easyA

pplic

atio

ns Web browser(webkit, midori)

Multimedia player

User Applications

LinuxLink

A

Media Services (Gstreamer,

VOIPAsterisk

JVMjamvm

Web Services (rest)

Window Manager(Matchbox)

(mplayer)

Web Server (httpd, boa)

Mail services

Flash(gnash)

UI Services

k Framew

ork I

Mid

dlew

are

X

(Gstreamer, ffmpeg)

GTK+ QT

Message bus (D-bus)

Bluetooth (bluez)

OpenSSLEmbedded DB

AsteriskjamvmClasspath

Cl tt C i!18N Rendering

(rest) (Matchbox)

OpenGL(mesa)

GPS (tango)

(httpd, boa)

Sensors (lm_sensors)

Location Services Codecs

services (gnash)

Device Sync (gUPnP)

Security

ntegration Servs

X p(SQLite)Clutter

(3D)Cairo (2D)

g(Pango) (geoclue)

Flash SD/MMC Watchdog Timer

I2C/SPI HW Specific Drivers

AudioBattery ROM/RAM

LCD

Display DirectFB

Audio ALSA

Power Mgmt

MemoryMgmt

KeypadTouchSceen

Wifi Bluetooth USBCamera Network Stack

y vices

Ker

nel &

Driv

ers

Real Time

Multi-core Timer DriversRAM Time core

Tools


9 How Does LinuxLink Work?

“How-To”Customer

40,000 sources• Mainline• Mailing Lists

Content

Internet

DesktopFactory g

• Semi/SOMs• 1000s of Packages• 3rd Party Tools

www.timesys.com

y• 3rd Party DriversOnline

FactoryTimeStorm IDE

Test via Timesys Board Farm

• Linux Platform

• Development Environment

• Technical Assistance


10 Boot Process in shortTypical Linux System Structure Boot Process Sequence

User Application(s)Power On

UBootRoot Filesystem

Packages Scripts

Hardware Init

UBootCopies kernel to T

Linux Kernel

Device A Device C

memory/uncompress

Kernel BootHardware/Subsystems

TIME

Bootloader

Device A Device B

initialization

RFSFetch/Mount/Boot into

Hardware

Fetch/Mount/Boot into

User Application


pp

11 Footprint optimization techniquesHardware

• Component selection mattersNOR fl h f XIP– NOR flash for XIP

– Clock Speed

Bootloader• Initialize only the needed hardware and pass the control quickly to the Linux

kernel• Enable only features that are needed (load, boot)

R h d bi • Remove hardware probing • Typically only few functions used in production system

Linux Kernel• Focal point of our today’s session• Many options available based on requirements• Number of options are easy to implement

Root filesystem and applications• Start Small• Minimize the initialization process


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12 Making Linux Kernel small and fastUse uncompressed kernel• Uncompressing takes time

Remove unused kernel options• Not used networking i.e. IPV6, multiple file systems

D b f d b l (f fi l d l )• Debug features and symbols (for final deployment)

Build device drivers as Loadable Kernel Modules• Keep the features needed at boot time built into the kernel• Remaining drivers built as LKMs will make kernel smaller

Consider various approaches for your RFS deployment• JFFS2 with appended journal summary (skip flash scan)• CRAMFS UBIFSCRAMFS, UBIFS

Suppress the console output• Use “quiet” with your kernel command line


• Use quiet with your kernel command line• Remove any possible verbosity from the kernel (i.e. printk)

13 Making Linux Kernel small and fastLinux kernel options we will look at today

Kernel Option Comment

CONFIG_EMBEDDED Disables or tweaks a number of kernel options and settings.

CONFIG IKCONFIG Saves complete kernel configuration in the kernelCONFIG_IKCONFIG Saves complete kernel configuration in the kernel

CONFIG_KALLSYMS Prints symbolic crash information and backtraces

CONFIG_BUG Disables BUG and WARN functions

CONFIG_HOTPLUG Can be disabled if no external devices will be attached and if you use static device files

CONFIG DNOTIFY File change notification to user space_ g p

CONFIG_EXT2 Disable if using jffs2 file system

CONFIG_PRINTK Makes kernel silent when disabled

CONFIG_PRINTK_TIME A way to track where time is spent at boot time

CONFIG_CC_OPTIMIZE_FOR_SIZE Will select –Os instead of –O2 resulting in a smaller kernel


kernel

14 Deployment We’ll use TFTP service to transfer images to the target• Runs typically as xinetd process

Di bl d h l i t ll d M dif / t / i td d/tft d• Disabled when newly installed. Modify /etc/xinetd.d/tftpd

Setup NFS to mount RFS via network for initial development• Runs as a daemon on your host• Export FS via /etc/exportsp / / p• Restart the NFS server via /etc/init.d/nfs service

Assign a static address or use dhcpAssign a static address or use dhcp

Bootloader setup proceduresetenv bootdelay 3setenv bootfile uImagesetenv bootargs console=ttyS2,115200n8 root=/dev/nfs rw ip=dhcpsetenv bootcmd dhcp;bootm


p

15 What we have accomplishedBuilt a starting point with Online Factory• Experiment on day one with a pre-built starting point

Modified Linux kernel using desktop tools• Optimized for footprint

O i i d f f b• Optimized for fast boot

Altered root filesystem• Removed unneeded startup scripts

Deployed the system on target with network mounted RFS• Transferred images via TFTP• Configured bootloader for autobootg• Booted the Linux kernel


16 Next TimeSession #2 is scheduled for Thursday, September 15th at 11:30am EST

Subject: EKG device — meeting application requirements and objectives through rapid requirements and objectives through rapid development with LinuxLink and open source middleware

• Modify the Root Filesystem to include needed middleware– Qt/Embedded for Linux– Dependencies

• Using Qt Designer create and compile an EKG demo image

• Integrate the complete solution and deploy on the target

• more fun to come


• more fun to come…

17 How Do I Learn More?

Go to www.timesys.com to learn more• Webinars• Webinars• LinuxLink Radio Podcasts• Request a Free Factory Test Drive

Schedule a more detailed introduction/training session• WebEx• Face-to-face


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