[ECOS] Re: ecos mem footprint with HTTPD support

Mandeep Sandhu mandeepsandhu.chd@gmail.com
Wed Jul 15 14:05:00 GMT 2009


On Wed, Jul 15, 2009 at 7:27 PM, Sergei
Gavrikov<sergei.gavrikov@gmail.com> wrote:
> Mandeep Sandhu wrote:
>>
>> seems like a std error? now back to reading your reply :) .....
>
> That error is not surprise for small memory footprint targets. I hope
> you get it. That trick did not fit an external RAM on your board, It did
> deceive linker and then you can use `size' utility.

Yes, I suspected that much. But tell me, where does the linker get the RAM
size constraint for the atmel board...i.e the sam7ex256? It must be configured
somewhere...as part of a template...no?

Couldn't we have "added" RAM there?

BTW, your trick worked...I pretty much get the same numbers as you
had shown...

Before reducing PBUF pool size:

arm-eabi-size test_install/tests/net/lwip_tcpip/v3_0/tests/httpd
   text	   data	    bss	    dec	    hex	filename
  71512	   5440	 102796	 179748	
2be24	test_install/tests/net/lwip_tcpip/v3_0/tests/httpd

After reducing it to 6:

arm-eabi-size test_install/tests/net/lwip_tcpip/v3_0/tests/httpd
   text	   data	    bss	    dec	    hex	filename
  71512	   5440	  46636	 123588	
1e2c4	test_install/tests/net/lwip_tcpip/v3_0/tests/http

So this figure is not too different from the FreeRTOS numbers for
similar app :)...

~/freeRTOS/FreeRTOS/Demo/lwIP_Demo_Rowley_ARM7$
~/gnuarm/gnuarm-3.4.3/bin/arm-elf-size rtosdemo.elf
   text	   data	    bss	    dec	    hex	filename
 119096	   2016	  62736	 183848	  2ce28	rtosdemo.elf

Do you think 256K RAM will be enough to run a similarly configured
system (with additional
USB device and SPI driver support) on ARM7 based embedded SoC?

-mandeep

>
>
> Sergei
>

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