Re: [ECOS] eCos kernel image size

[Jonathan Larmour <jifl at eCosCentric dot com>]

Gary Thomas wrote:
> On Wed, 2003-08-27 at 20:48, Satish Kumar wrote:
>
> > Hi,
> >    i have this basic doubt i guess..i m interested in knowing 
> > the eCos basic kernel image size..i only see a ecos library build
> > and when i try compiling the hello.c program with the above ecos 
> > library using arm-elf-gcc..my hello.bin is something around 780 kb, 
> > which is just too large..now this library contains default package.
> >
> > i m just interested in knowing only the eCos kernel image size 
> > with out the C library..!! how to know this kernel size..?
>
>
> You're not looking at the size of the program, just the size of
> the ELF image!  The ELF image contains *LOTS* of debug information
> which makes it appear quite large.  In reality, the kernel itself
> is quite small.  What you need to do is use the "size" utility to
> determine the actual memory requirements.
>
> For example, a "hello" application built with the default template:
> [gthomas@hermes t]$ ls -l hello
> -rwxr-xr-x    1 gthomas  wheel     1643945 Aug 27 21:33 hello
> [gthomas@hermes t]$ powerpc-eabi-size hello
>    text    data     bss     dec     hex filename
>   52940       0   16300   69240   10e78 hello
>
> > From this, you can see that the ELF file is 1.6MB, but the actual
> executable image is only 52KB of TEXT + 16KB of DATA.

And just to be clear: that's just the default configuration, which still 
has plenty of bells and whistles that you wouldn't need (certainly not for 
hello world :-)). And judicious use of the eCos Configuration Tool (or 
editting of ecos.ecc) will make that footprint smaller. *Much* smaller.

Jifl
--
eCosCentric    http://www.eCosCentric.com/    The eCos and RedBoot experts
--["No sense being pessimistic, it wouldn't work anyway"]-- Opinions==mine


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