eLinux.org - User contributions [en]

Vendors

2008-05-27T11:36:37Z

Cbrake: /* Overview */ add BEC Systems to list

== Overview ==

This page lists companies who offer services around embedded Linux, such as training, support, etc. We also list companies who provide Linux distributions specifically targeting embedded uses. If you are looking for companies who build and sell devices with Linux as their operating system, please see the [[Companies]] page.

* [http://www.ridgerun.com RidgeRun]
* [http://www.katdc.com KAT Digital Corp.]
* [http://www.sidebranch.com Sidebranch], The Netherlands.
* [http://www.mvista.com/ MontaVista]
* [http://www.timesys.com/ TimeSys]
* [http://www.windriver.com/ Wind River]
* [http://www.intellimetrix.us/ Intellimetrix]
* [http://www.linutronix.de/ Linutronix], Germany
* [http://www.lineo.co.jp/eng/index.html Lineo Solutions], Japan
* [http://www.denx.de/ DENX Software Engineering]
* [http://www.drivingdevices.com/ Driving Devices Limited], United Kingdom
* [http://www.wmltd.co.uk/ William Matthew Limited], United Kingdom
* [http://www.esfnet.co.uk/ Embedded Software Foundry Limited], Sheffield, UK
* [http://www.koansoftware.com/ KOAN sas], Bergamo, Italy
* [http://bec-systems.com/ BEC Systems], USA

[[Category:Companies]]

LocalUserGroups

2007-10-06T10:53:19Z

Cbrake:

Local Embedded Linux groups.<br/>
If you have interest in meeting with developers in your area, please add name and location.
= Ohio =
* [[User:Cbrake|Cliff Brake]] (Akron, OH)

== Virginia ==

* [[User:balister|Philip Balister]] (Blacksburg, VA)

== Pennsylvania ==

* [[User:svolpe|Shane Volpe]] (Pittsburgh, PA)
* [[User:sidhayn|Rick Farina]] (Pittsburgh, PA)

LocalUserGroups

2007-10-06T10:52:22Z

Cbrake:

Local Embedded Linux groups
If you have interest in meeting with developers in your area, please add name and location.
= Ohio =
* [[User:Cbrake|Cliff Brake]] (Akron, OH)

== Virginia ==

* [[User:balister|Philip Balister]] (Blacksburg, VA)

== Pennsylvania ==

* [[User:svolpe|Shane Volpe]] (Pittsburgh, PA)
* [[User:sidhayn|Rick Farina]] (Pittsburgh, PA)

LocalUserGroups

2007-09-26T15:46:19Z

Cbrake:

Local Embedded Linux groups
= OH, PA, ... =
If you have interest in meeting with developers in this area, please add your name and location.
* [[User:Cbrake|Cliff Brake]] (Akron, OH)

LocalUserGroups

2007-09-26T15:45:33Z

Cbrake: Add OH/PA local group

Local Embedded Linux groups
= OH, PA, ... =
If you have interest in meeting with developers in this area, please add your name and location.
* [[Cbrake|Cliff Brake]] (Akron, OH)

User:Cbrake

2007-09-26T15:09:33Z

Cbrake:

* Cliff Brake
* Embedded Systems Engineer
* http://bec-systems.com
* [[LocalUserGroups]]

User:Cbrake

2007-09-26T15:09:01Z

Cbrake: add LocalUserGroups page

* Cliff Brake
* Embedded Systems Engineer
* http://bec-systems.com
* LocalUserGroups

ELinuxWiki:Irc

2007-06-22T18:35:01Z

Cbrake: add #u-boot and #openjtag

= IRC Channels =
==Freenode irc.freenode.net==
{|
|-valign="top"
| #eLinux||Embedded Linux discussion.
|-valign="top"
|#edev||Discussion for small embedded device development and hacking.
|-valign="top"
|#openezx||Discussion about Motorola's EZX phone platform, such as the A780, E680 and E680i Linux based GSM phones.
|-valign="top"
|#dlinkhacking||This is the place to discuss software and hardware hacking of ALL DLink products
|-valign="top"
|#linux-sh||Linux on SuperH(SH) Devices.
|-valign="top"
|#mipslinux||Linux on MIPS Devices.
|-valign="top"
|##electronics||General electronics discussion.
|-valign="top"
|#oe||Channel for discussion of OpenEmbedded development environment [http://www.openembedded.org OE Homepage].
|-valign="top"
| #davinci||Discussions regarding the TI Davinci platform and EVM related hardware.
|-valign="top"
| #openmoko||Open Source Telephony
|-valign="top"
| #maemo||Nokia Internet Tablet OS
|-valign="top"
| #neuros|| Neuros OSD Hacking
|-valign="top"
| #usdtv|| USDTV/Hisense HDTV Receiver Hacking
|-valign="top"
| #u-boot||U-boot bootloader
|-valign="top"
| #openjtag||where the openocd folks hang out
|}

Boot Time

2007-03-08T12:53:26Z

Cbrake: /* Others */ Add link to psplash

This page has information about reducing boot-up time for a Linux system.
This is of interest for many embedded developers, because for many products customers
expect to be able to use them very soon after system startup.

== Technology/Project Pages ==
The following are individual pages with information about various technologies relevant to improving boot-up time for Linux. Some of these describe local patches available on this site. Others point to projects or patches maintained elsewhere.

=== Measuring Boot-up Time ===
*[[Printk Times]] - simple system for showing timing information for each printk.
*[[Kernel Function Trace]] - system for reporting function timings in the kernel.
*[[Linux Trace Toolkit]] - system for reporting timing data for certain kernel and process events.

=== Technologies and Techniques for Reducing Boot-up Time ===
*[[Disable Console]] - Avoid overhead of console output during system startup.
*[[RTC No Sync]] - Avoid delay to synchronize system time with RTC clock edge on startup.
*[[Short IDE Delays]] - Reduce duration of IDE startup delays (this is effective but possibly dangerous).
*[[Kernel XIP]] - Allow kernel to be executed in-place in ROM or FLASH.
*[[IDE No Probe]] - Force kernel to observe the ide<x>=noprobe option.
*[[Preset LPJ]] - Allow the use of a preset loops_per_jiffy value.
*[[Threaded Device Probing]] - Allow drivers to probe devices in parallel.
*[[Application XIP]] - Allow programs and libraries to be executed in-place in ROM or FLASH
*[[Pre Linking]] - Avoid cost of runtime linking on first program load
*[[Optimize RC Scripts]] - Reduce overhead of running RC scripts
*[[DMA Copy Of Kernel On Startup]] - Copy kernel from Flash to RAM using DMA
*[[Parallel RC Scripts]] - Run RC scripts in parallel instead of sequentially
*[[Application Init Optimizations]] - Improvements in program load and init time via:
#use of mmap vs. read
#control over page mapping characteristics.

== Information ==
*[[Boot-up Time Definition Of Terms]] - definitions of terms used by the CELF Bootup Time working group
*[[Kernel Instrumentation]] - lists some known kernel instrumentation tools. These are of interest for measuring kernel startup time.
*[[Filesystem Information]] - information about boot-up times with various file systems
*[[Image:alert.gif]] ''in progress'' - [[Boot-up Time Reduction Howto]] - this is a project to catalog existing boot-up time reduction techniques. Work on this project is under way. The wiki will serve as the primary repository of information gathered for this project.
*[[Image:alert.gif]]''no content yet'' - [[Boot-up Time Delay Taxonomy]] - list of delays categorized by boot phase, type and magnitude

=== Case Studies ===
*Samsung proof-of-acceptability study for digital still camera: see [[Linux Boot-up Time Reduction 4DSC.ppt|Linux Boot-Up Time Reduction]]
*Tim Bird's (Sony) survey of boot-up time reduction techniques:
**[http://www.finux.org/Reprints/Reprint-Bird-OLS2004.pdf Methods to Improve Boot-up Time in Linux] - Paper prepared for 2004 Ottawa Linux Symposium
**{{pdf|ReducingStartupTime v0.8.pdf|Reducing Startup Time in Embedded Linux Systems}} - December 2003 Presentation describing some existing boot-up time reduction techniques and strategies.

== Additional Projects/Mailing Lists/Resources ==
=== Kexec ===
*Kexec is a system which allows a system to be '''rebooted''' without going through BIOS. That is, a Linux kernel can directly boot into another Linux kernel, without going through firmware. See the white paper at: [http://developer.osdl.org/andyp/kexec/whitepaper/kexec.pdf kexec.pdf]
**2004 Kernel Summit presentation: [http://www.xenotime.net/linux/fastboot/fastboot-ks-2004.pdf fastboot.pdf]
**here's another Kexec white paper:[http://www-106.ibm.com/developerworks/linux/library/l-kexec.html?ca=dgr-lnxw04 Reboot Fast]

=== Others ===
*[http://www.bootsplash.org/ bootspash.org] - technology to put up a splash screen early in boot sequence
*[http://dev.gentoo.org/~spock/projects/gensplash/ Gentoo Splashscreen] - newer technology to put a splash screen early in the boot sequence
**see the HOWTO at: [http://gentoo-wiki.com/HOWTO_fbsplash HOWTO FBSplash]
* [http://butterfeet.org/?p=8 PSplash] - PSplash is a userspace graphical boot splash screen for mainly
embedded Linux devices supporting a 16bpp or 32bpp framebuffer.
*[http://www.linuxdevices.com/news/NS5907201615.html FSMLabs Fastboot] - press release by FSMLabs about fast booting of their product. Is any of this published?
*[http://www.bootchart.org/ Bootchart] - a tool for performance analysis and visualization of the Linux boot process. Resource utilization and process information are collected during the user-space portion of the boot process and are later rendered in a PNG, SVG or EPS encoded chart.

[[Category:Boot Time]]

Main Page

2007-01-03T16:55:27Z

Cbrake: add multimedia icon

{|
| nowrap style="vertical-align: top; font: bold xx-large sans-serif;" |
eLinux Wiki
|}

<div style="margin: 0; margin-right:10px; border: 1px solid #dfdfdf; padding: 0 1em 1em 1em; background-color:#ffffff; align:right;">
<font color="#FF0000">'''WARNING: DON'T LINK HERE YET! THE URL IS NOT FINALIZED!'''</font>

This is the '''[[EmbeddedLinuxWiki:About | eLinuxWiki]]''', the Wiki for Embedded Linux Developers. This site serves as a repository of useful information regarding the use of Linux in embedded implementations.

Please [[:Category:NeedsEditing|help to extend]] this wiki. Thank you!

<div style="margin-left: 50px;">
{|style="width: 100%; margin:0; padding:0; border-collapse: collapse;"
|style="width: 25%;"|
[[image:mp_help.png|16px]] [[Help:Contents|Site Policy]]<br/>
[[image:mp_info.png|16px]] [[Help:About|About]]
|style="width: 25%;"|
[[image:mp_man.png|16px]] [[Help:Editing|Editing Help]]<br/>
[[image:mp_wanted.png|16px]] [[Wanted|Wanted Pages]]
|style="width: 25%;"|
[[image:mp_mail.png|16px]] [[eLinuxWiki:Mailing List|Mailing List]]<br/>
[[image:mp_irc.png|16px]] [[eLinuxWiki:Irc|IRC]]
|style="width: 25%;"|
[[image:mp_admin.png|16px]] [[eLinuxWiki:Glossary|Glossary]]<br/>
[[image:mp_news.png|16px]] [[Links|Links]]
|}
</div>
</div>
{| width="100%"
|-
|style="vertical-align:top" |

<div style="margin: 0; margin-top:10px; margin-right:10px; border: 1px solid #dfdfdf; padding: 0 1em 1em 1em; align:right;">
'''Development Portals'''
<div style="margin-left: 25px;">
{|style="width: 100%; margin:0; padding:0; border-collapse: collapse;"
|style="width: 25%;"|
[[image:Welly1.jpg]] [[Boot Time]]<br /><br />
[[image:Multimedia.png]] [[Multimedia]]<br /><br />
[[image:Filecab.jpg]] [[File Systems]]
|style="width: 25%;"|
[[image:cfcard.jpg]] [[Memory Management]]<br /><br />
[[image:Power.png]] [[Power Management]]<br /><br />
[[image:clockface.jpg]] [[Real Time]]
|style="width: 25%;"|
[[image:Padlock2.jpg]] [[Security]]<br /><br />
[[image:Placeholder.png]] [[System Size]]<br /><br />
[[image:Placeholder.png]] [[Resource Management]]
|style="width: 25%;"|
[[image:Placeholder.png]] [[Events]]<br /><br />
[[image:Placeholder.png]] [[Hardware Hacking]]<br /><br />
[[image:Placeholder.png]] [[Toolbox]]
|}
</div>
</div>

<div style="margin:0; margin-top:10px; margin-right:10px; border:1px solid #dfdfdf; padding:0 1em 1em 1em; background-color:#ccffff; align:right; ">
'''Monthly Feature'''

In this space each month will be featured a topic relevant to Embedded Linux Development.
</div>
----
To experiment with this wiki try [[eLinuxWiki:Sandbox]]. See the [http://meta.wikipedia.org/wiki/MediaWiki_User%27s_Guide User's Guide] for usage and configuration help.

File:Multimedia.png

2007-01-03T16:54:31Z

Cbrake:

Main Page

2007-01-03T16:51:12Z

Cbrake: add power icon

{|
| nowrap style="vertical-align: top; font: bold xx-large sans-serif;" |
eLinux Wiki
|}

<div style="margin: 0; margin-right:10px; border: 1px solid #dfdfdf; padding: 0 1em 1em 1em; background-color:#ffffff; align:right;">
<font color="#FF0000">'''WARNING: DON'T LINK HERE YET! THE URL IS NOT FINALIZED!'''</font>

This is the '''[[EmbeddedLinuxWiki:About | eLinuxWiki]]''', the Wiki for Embedded Linux Developers. This site serves as a repository of useful information regarding the use of Linux in embedded implementations.

Please [[:Category:NeedsEditing|help to extend]] this wiki. Thank you!

<div style="margin-left: 50px;">
{|style="width: 100%; margin:0; padding:0; border-collapse: collapse;"
|style="width: 25%;"|
[[image:mp_help.png|16px]] [[Help:Contents|Site Policy]]<br/>
[[image:mp_info.png|16px]] [[Help:About|About]]
|style="width: 25%;"|
[[image:mp_man.png|16px]] [[Help:Editing|Editing Help]]<br/>
[[image:mp_wanted.png|16px]] [[Wanted|Wanted Pages]]
|style="width: 25%;"|
[[image:mp_mail.png|16px]] [[eLinuxWiki:Mailing List|Mailing List]]<br/>
[[image:mp_irc.png|16px]] [[eLinuxWiki:Irc|IRC]]
|style="width: 25%;"|
[[image:mp_admin.png|16px]] [[eLinuxWiki:Glossary|Glossary]]<br/>
[[image:mp_news.png|16px]] [[Links|Links]]
|}
</div>
</div>
{| width="100%"
|-
|style="vertical-align:top" |

<div style="margin: 0; margin-top:10px; margin-right:10px; border: 1px solid #dfdfdf; padding: 0 1em 1em 1em; align:right;">
'''Development Portals'''
<div style="margin-left: 25px;">
{|style="width: 100%; margin:0; padding:0; border-collapse: collapse;"
|style="width: 25%;"|
[[image:Welly1.jpg]] [[Boot Time]]<br /><br />
[[image:Placeholder.png]] [[Multimedia]]<br /><br />
[[image:Filecab.jpg]] [[File Systems]]
|style="width: 25%;"|
[[image:cfcard.jpg]] [[Memory Management]]<br /><br />
[[image:Power.png]] [[Power Management]]<br /><br />
[[image:clockface.jpg]] [[Real Time]]
|style="width: 25%;"|
[[image:Padlock2.jpg]] [[Security]]<br /><br />
[[image:Placeholder.png]] [[System Size]]<br /><br />
[[image:Placeholder.png]] [[Resource Management]]
|style="width: 25%;"|
[[image:Placeholder.png]] [[Events]]<br /><br />
[[image:Placeholder.png]] [[Hardware Hacking]]<br /><br />
[[image:Placeholder.png]] [[Toolbox]]
|}
</div>
</div>

<div style="margin:0; margin-top:10px; margin-right:10px; border:1px solid #dfdfdf; padding:0 1em 1em 1em; background-color:#ccffff; align:right; ">
'''Monthly Feature'''

In this space each month will be featured a topic relevant to Embedded Linux Development.
</div>
----
To experiment with this wiki try [[eLinuxWiki:Sandbox]]. See the [http://meta.wikipedia.org/wiki/MediaWiki_User%27s_Guide User's Guide] for usage and configuration help.

File:Power.png

2007-01-03T16:50:25Z

Cbrake: Power icon

Power icon

Talk:Real Time

2006-11-02T12:25:43Z

Cbrake: start outline

Possible outline:
* History of realtime in Linux
* What is soft real-time
* recent preemtible changes
* real wold examples

List of resources:
* [http://www.linuxjournal.com/article/5600 Lowering Latency in Linux: Introducing a Preemptible Kernel]
* [http://www.timesys.com/releases/home_bdy_news.php?show_article=1568 Kernel version 2.6.18 includes real-time improvements]

User:Cbrake

2006-10-13T17:29:34Z

Cbrake:

* Cliff Brake
* Embedded Systems Engineer
* http://bec-systems.com

User:Cbrake

2006-10-13T17:29:09Z

Cbrake: add page for cbrake login

Cliff Brake
Embedded Systems Engineer
http://bec-systems.com