System Size Working Group - Revision history

Cschalle: Add category

2011-10-28T06:30:28Z

Add category

Wmat: removing links to images that never existed

2010-01-26T21:49:57Z

removing links to images that never existed

Wmat: removing links to images that never existed

2010-01-26T21:49:37Z

removing links to images that never existed

Wmat: removing links to images that never existed

2010-01-26T21:49:17Z

removing links to images that never existed

Wmat: removing links to images that never existed

2010-01-26T21:49:00Z

removing links to images that never existed

Wmat: removing links to images that never existed

2010-01-26T21:48:26Z

removing links to images that never existed

FransMeulenbroeks at 08:57, 15 November 2008

2008-11-15T08:57:58Z

FransMeulenbroeks at 08:56, 15 November 2008

2008-11-15T08:56:36Z

RBot: Bot (Edward's framework)

2007-03-06T03:37:40Z

Bot (Edward's framework)

New page

@) '''''Preliminary Draft''''' @) under construction %)

Table of Contents:

== Introduction ==
=== Overview of "CE Linux" ===
Ten years ago, most of the people would have been laughing if someone
intended to use Linux in the embedded applications.Five years ago,few
people start thinking to use Linux for some of non-pc applications.
Now there is no surprize to hear that Linux is used in actual embedded
application - in fact, there are several actual products in the field.
You may wonder what makes such difference. The followings are the reason
that I can think of.

## CE products require pc-like feature
It is said that we are about to enter in new world with new life
style. "Ubiquitous" is the word frequently used to show such concept.
Although the word of "Ubiquitous" is still too abstract, everyone
shall agree that digital CE products - such as digital camera,
PVR, DVD-R - are part of our life. From software development point of
view, it is quite natural that software developer assume same or
simular environment with pc shall be available for such products.
If such environment is NOT available, software developers have to
spend long time which impacts to product launch timing and cost badly.

Linux provide rich, convenient and always up-to-date software development
environment.

## Semiconductor technology
By challenging and taking advanced silicon design rule, the price of
memory(RAM) has been going down dramatically and constantly. Similarly,
embedded processor speed is going up while the price has been going
down. Current $10 embedded processor performs 10+ times faster than
the one used in PC 10 years ago. Even if Linux is still big and slow
compared to other RTOS, the disadvantage is becoming small relatively.

Ten years later, people may be laughing if they hear that I wrote sentences
to explain about "why Linux in Embedded Application".

=== Overview of Linux Size Issue ===

Having said that Linux has been used in some of the actual products, Linux has
issues that can not be accepted by some of the products. Size is one of such issues.
The hardware configuration between CE products and [[PCs]] are very different. The following
example shall give you quick overview of the difference.
{|
|- bgcolor="80C0C0"
| align="center" | '''-'''
| align="center" | '''CE Product ex1'''
| align="center" | '''CE Product ex2'''
| align="center" | '''Enterprize'''
|- bgcolor="80C0C0"
| align="center" | -
| align="center" | Set Top Box(STB)
| align="center" | Celluler Phone
| align="center" | Desktop PC
|-
| align="center" | CPU(frequency)
| align="center" | MIPS(30MHz)
| align="center" | ARM(50MHz)
| align="center" | Pentium(2,200MHz)
|-
| align="center" | RAM size
| align="center" | 32Mbyte
| align="center" | 8Mbyte
| align="center" | 128+Mbyte
|-
| align="center" | Flash/ROM
| align="center" | 16Mbyte
| align="center" | 4Mbyte
| align="center" | -
|-
| align="center" | Strage
| align="center" | HDD 15Gbyte
| align="center" | none
| align="center" | HDD 30+Gbyte
|}

It is said that new type of CE(Consumer Electronics) applications with
pc-like feature will change our life dramatically. Those type of
applications are so called as "digital consumer product(appliance)" or
"Ubiquitous CE product".

=== Charter of SZWG ===
The System Size Working Group shall work to minimize the memory required
to operate a Linux system. The Working Group shall establish requirements,
recommended technical solutions and may define the appropriate feature
for consumer electronics devices.
=== Scope ===
WG shall discuss the following items, in order to achieve the
goal of minimize the memory usage.

# Benchmarking
#### Re-clarification of the Linux size issue by analysis and benchmarking with other OS
#### Capture high-level image of the issue. Make clarificaiton and characterize which software component- driver, kernel,middleware or application - makes Linux system fatty.

# XIP(execute-in-place)
#### Summary of advantage and disadvantage of XIP
#### Discussion on further improvement
#### Discussion on the workaround of disadvantate
#### WG shall establish requirement and recommended soluiton.

# Compressed File System
#### Summary of advantage and disadvantage of compress file
#### WG shall make comparison between XIP and Compressed File System and make summary, in different configurations.
#### WG shall establish requirement and recommended soluiton.

# Configurability
#### Configurable feature -- System Modularity
#### WG shall establish requirement and recommended solution.

# Subset Feature
#### Subset of library
#### Subset of middleware -- e.g. window system
#### WG shall establish requirement and/or may define the spec.

# Tool Chain improvement
#### compiler -- further optimizaiton
#### linker -- function level strip out, post link optimizaiton
#### memory usage profiling
#### WG shall establish requirement and recommended solution.

# Other method
#### Any other approach to achieve this charter.

=== Scope of this document ===
=== Definition of words ===
* AG
*** Architecture Group / This group is positioned under the SC. Founders, appinted members and associated are the member. The mission of the group are;
****** Help SC to strategize the technical direction of CELF
****** Make plan and process ,to improve the CELF property, such as kernel, tools , middleware and so on
****** Dispatch technical WG to address specific item

* CELF
*** Consumer Linux Forum
* CELF Source Tree
*** Linux kernel soruce tree maintained by CELF
* XIP
*** eXecution In Place / Typically, at the boot time, the code is copied from ROM to RAM and the code in RAM is actually executed. XIP is the technique to execute the code in ROM.
* WG
*** Working Group / AG shall establish technical WG to address specific topics. Each WG shall work on to fix/improve the issue. As of February 2004, there are following [[WGs]];
***** SZWG / System Size Working Group - A WG to address Linux System Size Issue
***** BTWG / Bootup Time Working Group - A WG to address Linux Boot up time Issue
***** RTWG / Real Time Wokring Group - A WG to address Linux Realtime response Issue
***** PMWG / Power Management Wrouking Group - A WG to address Power Management Issue
***** AVGWG / Audio Video & Graphics Working Group - A WG to address Audio & Graphics Issue
***** SECWG / Security Wroking Group - A WG to address Security Isse

== Clarification of Linux Size Issue ==
=== Profiling of CE products ===
=== Benchmarking with other hi-end RTOS ===
== Environment for this report ==
=== TI/Omap Platform(Reference Platform) ===
==== Overview ====
following picture is not real -- just space holder
[[Image:Omap.jpg]] [[Media:Omap.jpg]]

Brief introduction of TI/Omap board
==== Hardware Specification ====
*CPU
******* OMAP5910/OMAP1510
*Memory
******* 32MB SDRAM
******* 32MB Flash
*User IF
******* LCD/Touch Screen/CCFL front light
******* 4-wire touch screen controller
******* Dual RS232 port
******* Voice connectors,
******* Stereo amplifier and dual speakers
******* Power and up/down select buttons
******* USB host an client
******* Two serial ports
*Other
******* SD/MMC expansion slot
******* JTAG accessible

User's Manual

==== Software Specification ====

*Kernel
******* CELF 2003/10/30
*compiler
******* gnu
*User Land

=== KMC/SH4 Platform(Case Study) ===
==== Overview ====
==== Hardware Specification ====
==== Software Specification ====
=== Renesas/SH4 Platform(case study ===
==== Overview ====
==== Hardware Specification ====
==== Software Specification ====
== Legacy Embedded Linux Boot ==
=== Summary ===
=== Actual Size Data ===
The following table is just space holder
[[Image:table.jpg]]
=== Advantage ===
=== Disadvantage ===
=== Room for the improvement / Requirement ===
== Compressed Linux Boot ==
=== Summary ===
=== Actual Size Data ===
The following table is just space holder
[[Image:table.jpg]]
=== Advantage ===
=== Disadvantage ===
=== Room for the improvement / Requirement ===
== Kernel XIP ==
=== Summary ===
=== Actual Size Data ===
The following table is just space holder
[[Image:table.jpg]]
=== Advantage ===
=== Disadvantage ===
=== Room for the improvement / Requirement ===
== Kernel & Apps XIP ==
=== Summary ===
=== Actual Size Data ===
The following table is just space holder
[[Image:table.jpg]]
=== Advantage ===
=== Disadvantage ===
=== Room for the improvement / Requirement ===

← Older revision		Revision as of 06:30, 28 October 2011
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	=== Disadvantage ===		=== Disadvantage ===
	=== Room for the improvement / Requirement ===		=== Room for the improvement / Requirement ===
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		+	[[Category:CE Linux Working Groups]]

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 === Actual Size Data ===
 The following table is just space holder
-   [[Image:table.jpg]]
+   Image:table.jpg
 === Advantage ===
 === Disadvantage ===
 === Room for the improvement / Requirement ===

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 ==== Overview ====
          following picture is not real -- just space holder
-  [[Image:Omap.jpg]]   [[Media:Omap.jpg]]
+  Image:Omap.jpg   Media:Omap.jpg
        Brief introduction of TI/Omap board
 ==== Hardware Specification ====
    *CPU

@@ Line 143: / Line 143: @@
 *** eXecution In Place / Typically, at the boot time, the code is copied from ROM to RAM and the code in RAM is actually executed. XIP is the technique to execute the code in ROM.
 * WG
-*** Working Group / AG shall establish technical WG to address specific topics. Each WG shall work on to fix/improve the issue. As of February 2004, there are following [[WGs]];
+*** Working Group / AG shall establish technical WG to address specific topics. Each WG shall work on to fix/improve the issue. As of February 2004, there are following WGs;
 ***** SZWG / System Size Working Group - A WG to address Linux System Size Issue
 ***** BTWG / Bootup Time Working Group - A WG to address Linux Boot up time Issue

@@ Line 44: / Line 44: @@
    Having said that Linux has been used in some of the actual products, Linux has
    issues that can not be accepted by some of the products. Size is one of such issues.
-   The hardware configuration between CE products and [[PCs]] are very different. The following
+   The hardware configuration between CE products and PCs are very different. The following
    example shall give you quick overview of the difference.
 {|