[ECOS] Re: ecos memory footprint

[Mandeep Sandhu]

On Tue, Jul 14, 2009 at 7:51 PM, Grant Edwards<grant.b.edwards@gmail.com> wrote:
> On 2009-07-14, Simon Kallweit <simon.kallweit@intefo.ch> wrote:
>> Mandeep Sandhu schrieb:
>>
>>> Anybody knows if ECOS can run in 64KB mem (or lesser) with the
>>> following features:
>>>
>>> * USB Device/slave support
>>> * SPI Driver support
>>> * Networking support (for running a small webserver)
>>>
>>> I've not yet narrowed down on my h/w yet...but Microchips
>>> PIC32MX460F128H seems promising? But the sad part is that ecos
>>> doesn't show this in their list of supported h/w.
>>>
>>> Have ppl run ecos on microcontrollers w/o external SDRAM (I'm
>>> trying to conserve power by not having ext RAM)?
>>
>> This will be rather tough, but probably possible. You should use the
>> lwIP networking stack to keep memory usage low. Also, try to use as few
>> threads as possible, as this saves you valuable stack memory.
>
> I agree that it's probably possible, but IMO you're going to
> spend a lot of time trying to make everything fit -- effort
> that could be better spent on developing and testing your
> application.  I'd recommend a serious look at using something
> intended for a smaller footprint (XMK, FreeRTOS, uC/OS-II, etc.).

Yes, I'm evaluating FreeRTOS as well for my requirements. I've just
compiled their
sample webserver app for the same Atmel platform. And that doesn't look too good
as well! :(

~/freeRTOS/FreeRTOS/Demo/lwIP_Demo_Rowley_ARM7$ arm-elf-size rtosdemo.elf
   text	   data	    bss	    dec	    hex	filename
 119096	   2016	  62736	 183848	  2ce28	rtosdemo.elf

~/freeRTOS/FreeRTOS/Demo/lwIP_Demo_Rowley_ARM7$ arm-elf-objdump -h rtosdemo.elf

rtosdemo.elf:     file format elf32-littlearm

Sections:
Idx Name          Size      VMA       LMA       File off  Algn
  0 startup       00000044  00100000  00100000  00008000  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, CODE
  1 prog          0001d0f4  00100044  00100044  00008044  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, CODE
  2 .data         000007e0  00200000  0011d138  00028000  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  3 .bss          0000f510  002007e0  002007e0  000287e0  2**3
                  ALLOC
  4 .debug_abbrev 00007274  00000000  00000000  000287e0  2**0
                  CONTENTS, READONLY, DEBUGGING
  5 .debug_info   0002cb4d  00000000  00000000  0002fa54  2**0
                  CONTENTS, READONLY, DEBUGGING
  6 .debug_line   00007e5c  00000000  00000000  0005c5a1  2**0
                  CONTENTS, READONLY, DEBUGGING
  7 .debug_frame  00003400  00000000  00000000  00064400  2**2
                  CONTENTS, READONLY, DEBUGGING
  8 .debug_pubnames 0000213a  00000000  00000000  00067800  2**0
                  CONTENTS, READONLY, DEBUGGING
  9 .debug_aranges 00000ba8  00000000  00000000  00069940  2**3
                  CONTENTS, READONLY, DEBUGGING
 10 .debug_str    00002410  00000000  00000000  0006a4e8  2**0
                  CONTENTS, READONLY, DEBUGGING
 11 .comment      000005fa  00000000  00000000  0006c8f8  2**0
                  CONTENTS, READONLY
 12 .debug_ranges 000001d8  00000000  00000000  0006cef2  2**0
                  CONTENTS, READONLY, DEBUGGING

This does not give the exact figure (as I think the config here does
not have the
SPI driver built-in), but I'm using the results here to just get some
rough comparative
figure vis-a-vis ecos with roughly the same config.

I think i'll have to "up" my RAM  requirements to have at least 256KB
RAM. Though
I'm not sure if i'll be able to meet my price budget constraints.

-mandeep

>
> --
> Grant Edwards                   grante             Yow! I had pancake makeup
>                                  at               for brunch!
>                               visi.com
>
>
> --
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>

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