How big is RTEMS?

[Paul Evans]

Hi,

I did a reasonable size application on a 68k with 512K of flash, RTEMS 
itself was less than 128K (including bsp/bootstrap). While looking at 
the RTEMS code I was concerned that empty tables and API's would eat up 
memory space (this system had no networking but did have termios) but in 
reality it didn't prove to be a problem.

In my experience  RAM was more of a problem.  Some of the basic types 
used more RAM space than was really needed in that application, but it 
squeaked by.

    -Paul


Joel Sherrill wrote:
> Jonathan Kalbfeld wrote:
>   
>> Depending on how you are going to be launching the kernel and if your
>> bootloader can deal with compressed images, you can probably get it
>> down to a few hundred k.
>>
>> I have a hello world that is about 93k compressed, but that is for
>> i386, and we know that CISC code is usually more compact.
>>
>>   
>>     
> That is about typical for hello world on a BSP which has any significant
> work to do at startup or shutdown.    The SPARC BSPs hello world
> is in the same range.
>
> Again long term, there are some identified ways in which the minimum
> footprint of RTEMS can be trimmed.
>
> --joel
>   
>> jonathan
>>
>> On 2/26/07, Michael Silva <mjsilva at swfla.rr.com> wrote:
>>   
>>     
>>> Pardon me for asking such a basic question, but I couldn't find any
>>> data on the RTEMS site.  I think RTEMS may be just the OS I'm looking
>>> for but I'd like to get some idea of its memory requirements.  Is
>>> there any sort of matrix listing code size for various
>>> configurations, from a bare-bones tasking kernel on up?  My
>>> particular focus is ARM7 at the moment, and I want to get an idea how
>>> small/cheap I can go in that family.  Thanks.
>>> _______________________________________________
>>> rtems-users mailing list
>>> rtems-users at rtems.com
>>> http://rtems.rtems.org/mailman/listinfo/rtems-users
>>>
>>>     
>>>       
>>   
>>     
>
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