AW: [ECOS] linker script problem

AW: [ECOS] linker script problem

[Neundorf, Alexander]

Hi Laurent, 

> Von: ecos-discuss-owner@ecos.sourceware.org
> [mailto:ecos-discuss-owner@ecos.sourceware.org]Im Auftrag von GONZALEZ
> Laurent
....
> > This is what the list file says:
> > 
> > -----%<---------------------------------------------------
> > testapp:     file format elf32-littlearm
> > testapp
> > architecture: arm, flags 0x00000112:
> > EXEC_P, HAS_SYMS, D_PAGED
> > start address 0x00020040
> > 
> > ...
> >  17 .ram2         020000fa  04000000  04000000  00040000  2**0
> >                   CONTENTS, ALLOC, LOAD, DATA
> > ...
> > 040000fa g     O .ram2	02000000 RealBigBuffer
> > ...
> > 04000000 g     O .ram2	000000fa Buffer
> 
> I'am afraid that .ram2 section is loadable.
> 
> My guess is that your .ram2 section also contains an 
> initialized variable (Buffer?), thus the whole section is 
> tagged "CONTENTS, ALLOC, LOAD, DATA" like another .data section.

Initialized in which way ?
Could you please explain a bit more ?

Thanks
Alex

--
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss

Re: [ECOS] linker script problem

[GONZALEZ Laurent]

alexander,

On Fri, 22 Apr 2005 12:04:01 +0200
"Neundorf, Alexander" <Alexander.Neundorf@jenoptik.com> wrote:

> Hi Laurent, 
> 
> > Von: ecos-discuss-owner@ecos.sourceware.org
> > [mailto:ecos-discuss-owner@ecos.sourceware.org]Im Auftrag von GONZALEZ
> > Laurent
> ....
> > > This is what the list file says:
> > > 
> > > -----%<---------------------------------------------------
> > > testapp:     file format elf32-littlearm
> > > testapp
> > > architecture: arm, flags 0x00000112:
> > > EXEC_P, HAS_SYMS, D_PAGED
> > > start address 0x00020040
> > > 
> > > ...
> > >  17 .ram2         020000fa  04000000  04000000  00040000  2**0
> > >                   CONTENTS, ALLOC, LOAD, DATA
> > > ...
> > > 040000fa g     O .ram2	02000000 RealBigBuffer
> > > ...
> > > 04000000 g     O .ram2	000000fa Buffer
> > 
> > I'am afraid that .ram2 section is loadable.
> > 
> > My guess is that your .ram2 section also contains an 
> > initialized variable (Buffer?), thus the whole section is 
> > tagged "CONTENTS, ALLOC, LOAD, DATA" like another .data section.
> 
> Initialized in which way ?
> Could you please explain a bit more ?
> 

Buffer might have been initialized in your C code by a statement like:
char Buffer[0xfa] = "Hallo welt\n";

However, the most important thing is that the .ram2 section has wrong attributes despite the presence of (NOLOAD) type specifier ! I only suggested that it could comes from some initialized data.

What does your target.ld file looks like ? Are you sure that it is properly generated, or that you really use the good one when your application links ?

-- 
GONZALEZ Laurent
-----------------------------------------
Real-Time OS Team Leader
TRANGO Systems - ELSYS Design Group
74, avenue des Martyrs
38000 Grenoble
Tel: 33 (0)4 76 12 28 44
Fax: 33 (0)4 76 12 28 49
-----------------------------------------
Trango, the real-time embedded hypervisor
http://www.trango-systems.com

-- 
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss

AW: [ECOS] linker script problem

[Neundorf, Alexander]

Hi Laurent, 

> Von: GONZALEZ Laurent [mailto:laurent.gonzalez@trango-systems.com]
...
> However, the most important thing is that the .ram2 section 
> has wrong attributes despite the presence of (NOLOAD) type 
> specifier ! I only suggested that it could comes from some 
> initialized data.
> 
> What does your target.ld file looks like ? Are you sure that 
> it is properly generated, or that you really use the good one 
> when your application links ?

Ok, I checked again, the snippet was from an older version of the listing file. Now ram2 is only "ALLOC", nothing more.
The buffer isn't initialized in any way.

Alex

--
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss