CELF Project and Conference Information Tim Bird CELF Architecture Group Chair

2 Agenda Previous projects New Project List for 2010 Contract work update Conferences

Previous Contract Work

Function-sections work

Function-sections Add support for compiler flag -ffunction- sections to Linux kernel Goal is to shrink the size of the Linux kernel image by up to 10% Contractor: Denys Vlasenko Status: patches for linker section renaming are mainlined in Remaining work is to fix missing dependencies at link time See sections_Denys_Vlasenko.pdfhttp://elinux.org/images/2/2d/ELC2010-gc- sections_Denys_Vlasenko.pdf

New Contract Work

New 2010 Projects Have final result of CELF Open Project Proposals Essentially ends the process that began in December 2009, to solicit project ideas from the public Now have: List of approved projects for 2010 Funding approved by CELF Architecture Group and Board of Directors Approval was done in April at CELF meetings in San Francisco

Approved New Project List LZO compression in SquashFS Mainline PramFS filesystem Investigate UBIFS mount time problems Mainline the YAFFS2 filesystem Create a trace data format standard Online training for using RT-Preempt Add bootchart logging support to busybox Enhance ARM processor support in U-Boot Improve kexecboot program

LZO compression in SquashFS Project to add support for LZO compression to SquashFS LZO is faster than zlib, but slower than LZMA LZO is smaller than zlib, but larger than LZMA LGE provided patches for LZO support They should get submitted In merge window CELF may pay Phillip a small amount for work related to pushing this upstream

Mainline PramFS Add PramFS (protected RAM filesystem) to the mainline kernel Purpose: Support a protected region of memory where applications or kernel can store data between reboots Contractor: Marco Stornelli Status: Still working on contract Need to see if recent RAMoops work makes this obsolete

Investigate UBIFS mount time problems UBIFS has poor mount time performance Scales linearly with size of flash Project is to measure times and identify problem area Contractor: Free Electrons Status: Contract signed, work has begun Should have report by end of summer Expect report at ELC Europe

Mainline YAFFS2 YAFFS2 is a popular flash filesystem, but it is out-of-tree. Goal is to mainline the filesystem Contractor: Aleph One Status: Contract signed, work has begun Co-funded by Google and CELF There are issues with YAFFS2 supporting more than just Linux Out-of-tree version of YAFFS2 needs to be maintained for WinCE and other embedded OSes

Trace data format standard Work to create a single, standard file format for trace data Goal is ability for any viewer to run on the data from any tracer Don’t plan to have every tracer produce file as their native format Instead, write converters for each tracers to the standard format Contractor: EfficiOS Status: Contract signed

Online RT-preempt training Create tutorial and training materials to help developers use RT-preempt effectively Work will be placed on elinux wiki Contractor: K Computing Status: Contract Signed

bootchartd in busybox Adds 'bootchartd' support to busybox, so that user-space bootup can be recorded and then converted to nice chart Contractor: Denys Vlasenko Status: Work is completed Now awaiting test results Toshiba has a test report in this Jamboree!! (Thanks!)

U-Boot ARM Enhancements Improve U-Boot on ARM Support for turning on caches during boot Should significantly improve boot time Ability to relocate kernel Support for multi-stage boot Contractor: Denx Software Status: Contract still in progress

kexecboot improvements Kexecboot is a UI when using Linux kernel as a bootloader Improve kexecboot in a number of ways Add MIPS architecture and UBIFS support Implement text user interface Improve graphical user interface Write users and developers guides Contractor: Yuri Bushmelev Status: Contract signed, work not started yet

Conferences

Past Conferences ELC 2010 – April 12-14, San Francisco Report at Jamboree after lunch

Conferences coming up... LinuxCon (US) – August 10-12, Boston LinuxCon Japan – September 27-29, Tokyo ELC Europe 2010 – October 27-28, Cambridge, UK Kernel Summit – November 1-2, Cambridge, Massachusetts

Embedded Linux Conference Information available at:

LinuxCon Japan September in Tokyo, Japan In Roppongi Hills CELF is a sponsor and is helping to organize the embedded track Embedded Linux Summit planned for September 30

ELC Europe 2010 Location: Cambridge, UK Date: October Proposals accepted through June 30 Tentative joint events Open Source DLNA summit Gstreamer conference

Questions & Answers!