RE: [ECOS] Executable Size

RE: [ECOS] Executable Size

[Dan Conti]

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> -----Original Message-----
> From: Carlos Camargo [ mailto:carlos_ivan_camargo@yahoo.com ]

[snip]

> arm-elf-gcc -mcpu=arm7di -c -o twothreads.o -static
> -Wall -I/root/ecos-work/install/include
> -ffunction-sections -fdata-sections twothreads.c
> arm-elf-gcc -mcpu=arm7di -nostartfiles
> -L/root/ecos-work/install/lib -Wl,--gc-sections -o
> twothreads twothreads.o -Ttarget.ld -nostdlib 
> 
> 
>    text	   data	    bss	    dec	    hex	filename
>   45880	   1956	  23544	  71380	  116d4	twothreads
> 
> But, i don`t understand this information, when i use
> man size don´t provide information about this format

It's giving you the size in bytes of each of the sections (sort of).
text is the size of the code, so 45k code. data is, i believe, both the
.data section and the .rodata section (which are preinitialized data,
the latter being const). bss is zero initialized data. the next value,
dec, is the total size in decimal, and the following one, hex, is the
total size in hex.

It's quite easy to get very small images with eCos. I've packed a lot
into a 160k image. :)

-Dan


> 
> Thanks Carlos Camargo
> 
> 
> 
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Re: [ECOS] Executable Size

[Jonathan Larmour]

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Carlos Camargo wrote:
> 
>    text    data     bss     dec     hex filename
>   45880    1956   23544   71380   116d4 twothreads
> 
> But, i don`t understand this information, when i use
> man size don´t provide information about this format

Try "info size" which is a little bit better.

But basically, text==code, and data+bss==your program data. This totals
71380 bytes in this case (rather large for such a simple case, but easily
reduced by tailoring your eCos configuration if you choose).

For a program programmed into ROM/Flash, you would find the total ROM usage
to be text+data, and the total RAM usage to be data+bss.

Jifl
-- 
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Re: [ECOS] Executable Size

[Carlos Camargo]

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Hi..
Jonathan thanks for your answer..

When i compile the twothreads example:

arm-elf-gcc -mcpu=arm7di -c -o twothreads.o -g -Wall
-I/root/ecos-work/install/include -ffunction-sections
-fdata-sections twothreads.c
arm-elf-gcc -mcpu=arm7di -nostartfiles
-L/root/ecos-work/install/lib -Wl,--gc-sections -o
twothreads twothreads.o -Ttarget.ld -nostdlib  


and i execute arm-elf-size twothreads:

   text	   data	    bss	    dec	    hex	filename
  45880	   1956	  23544	  71380	  116d4	twothreads

When i Buils whitout "-g" option 


arm-elf-gcc -mcpu=arm7di -c -o twothreads.o -static
-Wall -I/root/ecos-work/install/include
-ffunction-sections -fdata-sections twothreads.c
arm-elf-gcc -mcpu=arm7di -nostartfiles
-L/root/ecos-work/install/lib -Wl,--gc-sections -o
twothreads twothreads.o -Ttarget.ld -nostdlib 


   text	   data	    bss	    dec	    hex	filename
  45880	   1956	  23544	  71380	  116d4	twothreads

But, i don`t understand this information, when i use
man size don´t provide information about this format

Thanks Carlos Camargo



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Re: [ECOS] Executable Size

[Jonathan Larmour]

> 
> When i compile the hello world example the executable
> size is 1.1M, is this posible??? 

The executable size may be 1.1M, but that's because of debug information.
Use arm-elf-size on the executable to get the true size.

But you're correct that more unnecessary stuff could be stripped out by
judicious configuration of eCos using the Configuration Tool. But that's up
to you. At least, the situation is not what you think anyway.

Jifl
-- 
Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223) 271062
Maybe this world is another planet's Hell -Aldous Huxley || Opinions==mine
Come to the Red Hat TechWorld open source conference in Brussels!
Keynotes, techie talks and exhibitions    http://www.redhat-techworld.com/

[ECOS] Executable Size

[Carlos Camargo]

Hi all.

I have a question:

I have arm evaluator 7t, i build ecos:

ecosconfig new e7t
ecosconfig tree
make

The Makefile is:

PKG_INSTALL_DIR = /root/ecos-work/install
XCC = arm-elf-gcc -mcpu=arm7di                        
ifeq ($(XCC),sh-elf-gcc)
#CFLAGS        = -ggdb
else
#CFLAGS        = -g
CFLAGS		= -static
endif

CXXFLAGS      = $(CFLAGS)

EXTRACFLAGS   = -Wall -I$(PKG_INSTALL_DIR)/include
-ffunction-sections -fdata-sections

EXTRACXXFLAGS = $(EXTRACFLAGS) -fno-exceptions
-fno-rtti -fvtable-gc -finit-priority

LDFLAGS       = -nostartfiles -L$(PKG_INSTALL_DIR)/lib
-Wl,--gc-sections
LIBS          = -Ttarget.ld -nostdlib

LD            = $(XCC)
XCXX          = $(XCC)



When i compile the hello world example the executable
size is 1.1M, is this posible??? How i Can erase
drivers for ecos in linux???

Thanks

Carlos Camargo


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