RTEMS on tiny microcontroller

[Andrew Sporner]

Hi

If you look at the normal RTEMS wiki you might note that I
am working on bringing the current TCP/IP stack to RTEMS.

I hope to have something at the end of August ready (or perhaps
a little sooner.)


Andy


On Tue, Jun 23, 2009 at 12:36 PM, Benoit
Camus<benoit.camus at leroy-autom.com> wrote:
> After doing some tests with samples applications, i've got quite same
> binary size as your.
> I will try it on the 512Ko/128ko version of the microcontroler.
>
> I was currently using Lwip but due to lack of some options, i need to
> change. That's why i'm so
> interst in FreeBSD stack.
>
> There's on wiki a page about TinyRTEMS which i think is a really
> interesting project.
> It says project was up to 25% in 2007, what is the state today ? Is
> there any way to contribute ?
>
> Just a last question, what the preferred way to implement/use static
> allocation ?
>
> Benoit
>> Benoit Camus wrote:
>>
>>> Hello all,
>>>
>>> I read a lot of thing about memory usage on mailing list and have to say
>>> i'm a bit in doubt about it.
>>>
>>> Here is the available memory i have: 256ko Flash /  64ko RAM ( could be
>>> 512/128 but i'd really like to avoid it ).
>>> The microcontroller i use is an arm: at91sam7x.
>>>
>>> The question is what i need ?
>>> Of course the kernel itself, ideally with the posix interface and the
>>> Ethernet stack (the FreeBSD one).
>>> I guess this last point is the worst. and i don't need all of the stack
>>> just: TCP, UDP layers ( 2-3 connection for each ), Broadcast and
>>> Multicast capability and that's it.
>>>
>>
>> Here is the memory layout for an application with telnet and FTP services on an
>> LPC2478 (ARM Thumb):
>>
>> Idx Name          Size      VMA       LMA       File off  Algn
>>   0 .start        00000120  00000000  00000000  000000d4  2**2
>>                   CONTENTS, ALLOC, LOAD, READONLY, CODE
>>   1 .vector       000005c0  40000000  40000000  00061bd4  2**0
>>                   ALLOC
>>   2 .text         00048540  00000120  00000120  000001f4  2**2
>>                   CONTENTS, ALLOC, LOAD, CODE
>>   3 .rodata       0000b380  00048660  00048660  00048734  2**2
>>                   CONTENTS, ALLOC, LOAD, READONLY, DATA
>>   4 .data         0000e120  a0400000  000539e0  00053ab4  2**2
>>                   CONTENTS, ALLOC, LOAD, DATA
>>   5 .bss          00007880  a040e120  a040e120  00061be0  2**5
>>                   ALLOC
>>
>>
>>> Considering all this needs, do you think it will fit in memory ? Is
>>> there any options fine tune the system and  drop down it size ?
>>>
>>
>> As far as I know the TCP/IP stack is monolithic in RTEMS.  You may have a look
>> at http://www.rtems.com/wiki/index.php/Open_Projects#LWIP.
>>
>>
>>> A last question to help me doing some tests, where could i find a
>>> ready-to-use arm-rtems compiler ?
>>>
>>
>> http://www.rtems.com/wiki/index.php/RTEMS_Development_Hosts
>>
>>
>>> Thanks in adavance.
>>> B. Camus
>>>
>>>
>>
>>
>>
>
>
> --
>
> Benoît CAMUS
> Leroy Automatique Industrielle
> Bd du Libre échange - 31650 Saint-Orens
> Standard : 05.62.24.05.50
> e-mail : benoit.camus at leroy-autom.com
>
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