[ECOS] how to configure eCos small enough to run on at91sam7s64

Sergei Gavrikov sergei.gavrikov@gmail.com
Sun May 31 16:41:00 GMT 2009


wb ning writes:

[cut]

> After building the library, i  use the command " arm-eabi-gcc -g
> -IBASE_DIR/ecos-work/install/include hello.c
> -LBASE_DIR/ecos-work/install/lib -Ttarget.ld -nostdlib" to build the
> HelloWorld test. Then a "a.out" exist.

eCos has `examples' directory which contains the scripts to get up a
proper Makefile to compile your eCos application.

> But when i use shell command "./a.out", i cann't get any output. Must
> i have download to the board to run the test?

Of course, if that is _RAM_ startup build, otherwise, you should burn
the application in the ROM like RedBoot and use JTAG, LED(s), or cross
the fingers.

And what is a reason to do not try the eCos tests first? Any eCos test
is more useful than one-line greeting

  make -s hal/common/v3_0 tests
  ls -R install/tests

> i can find the size of the "a.out" is 137k.  Is this size the same as
> your said "code/data size", How can i get the *.elf file and use
> arm-eabi-size to find out the code/data size?

Please, refer to eCos FAQ
http://ecos.sourceware.org/fom/ecos?file=91

Usually, an eCos application without the eCos kernel is just a few of
kilobytes:

  arm-eabi-size install/tests/hal/common/v3_0/tests/*

The tips how to reduce amount of memory for eCos you can find seeking
through out the eCos discuss list, or just here:

http://opensource.zylin.com/smallecos.html

Sergei

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