RTEMS on tiny microcontroller

[asporner at googlemail.com (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
>>>
>>>
>>
>>
>>
>
>
> --
>
> Beno?t CAMUS
> Leroy Automatique Industrielle
> Bd du Libre ?change - 31650 Saint-Orens
> Standard : 05.62.24.05.50
> e-mail : benoit.camus at leroy-autom.com
>
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