We were able to downsize RTEMS to about 9k for the LPC1768. Marcos, could you give a hint?
On Wed, Dec 17, 2014 at 1:34 PM, Joel Sherrill <joel.sherr...@oarcorp.com> wrote: > > > > On December 17, 2014 8:00:50 AM PST, Hesham Moustafa < > heshamelmat...@gmail.com> wrote: > >Hi all, > > > >I am working on reducing RTEMS size to fit into <32KB as every Epiphay > >core has only 32KB of local memory. I was able to get hello and > >minimum samples with aggressive size reduction by manually removing > >un-needed code. Currently I only use libcsupport, sapi, score, rtems > >built for cpukit only, and for each, some source code files were > >removed. No IO, no FS, no barrier, event, managers are included. > > Our minimum is where it is because no one has provided lower requirements. > Some of the things you dropped out could be addressed by initialization > being more like a constructor table that is automatically built based on > dependencies. This was/is the sequenced initialization project. I don't > know the state of it. > > Try turning on per section methods and data like the SPARC bsps. This > saves memory. > > > Defining which features are part of 'nanoRTEMS' is a big part of this. > Then those requirements can drive dropping things not covered by sequenced > initialization and finer tuning. > > Using printk saves a lot of memory. > > >And I > >added -Os flag. However when building ticker, the .text area overflows > >the 32KB local memory by about 8KB. > > > >The question is, what are the very basic mandatory sources/libraries > >and/or managers that are enough to build ticker? > > Some of that is stack size in ticker. Look at the ticker variants in > examples-v2 > > >Regards, > >Hesham > >_______________________________________________ > >devel mailing list > >devel@rtems.org > >http://lists.rtems.org/mailman/listinfo/devel > > --joel > _______________________________________________ > devel mailing list > devel@rtems.org > http://lists.rtems.org/mailman/listinfo/devel > -- Daniel F. Gutson Chief Engineering Officer, SPD San Lorenzo 47, 3rd Floor, Office 5 Córdoba, Argentina Phone: +54 351 4217888 / +54 351 4218211 Skype: dgutson LinkedIn: http://ar.linkedin.com/in/danielgutson
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