Re: eCos + LPC21xx footprint

[Jani Monoses <jani at iv dot ro>]

Thomas Schrein wrote:
> Hi list,
>
> I am thinking about to use eCos on Philips LPC2106.
> With my information the footprint of a minimal system should be about 90k !! ROM (
> the LPCs has only less then 128k flash available). This would be too much to use
> eCos in a real application.
>
> Does anyone of you have experiences regarding the footprint ?

The footprint for the ecos tests is about the same as for any ARM platform:

minimal config:

jani@cow ~/work/build/mcb2100/minimal $ size install/tests/hal/common/current/tests/*
   text	   data	    bss	    dec	    hex	filename
   8954	    452	   4468	  13874	   3632	install/tests/hal/common/current/tests/basic
   8438	    452	   4468	  13358	   342e	install/tests/hal/common/current/tests/cache
   8798	    456	  12672	  21926	   55a6	install/tests/hal/common/current/tests/context
  11883	    460	   4492	  16835	   41c3	install/tests/hal/common/current/tests/intr
jani@cow ~/work/build/mcb2100/minimal $ size install/tests/infra/current/tests/cxxsupp
   text	   data	    bss	    dec	    hex	filename
  16272	    464	   4672	  21408	   53a0	install/tests/infra/current/tests/cxxsupp


if you have the kernel package included it gets a bit larger.

  text	   data	    bss	    dec	    hex	filename
  53084	   1464	  38304	  92852	  16ab4	install/tests/kernel/current/tests/tm_basic


So both the RAM and the flash on LPC2106 seems plenty for small apps, ecos' overhead is 
not much more than if you had to write the hw glue and drivers yourself.

Jani