[ECOS] forwarded message from Simpkins, Andy

[Jesper Skov <jskov@redhat.com>]

To : Jesper Skov <jskov at redhat dot com>
Subject : RE: [ECOS] running code from RAM / Memory Regions
From : "Simpkins, Andy" <Andy dot Simpkins at Transcomm dot uk dot com>
Date : Fri, 17 Aug 2001 14:36:52 +0100

Hi there,

Thanks for the pointers, I am afraid that I still need a little more help
though

Thanks

Andy


> -----Original Message-----
> From: Jesper Skov [ mailto:jskov@redhat.com ]
> Sent: 17 August 2001 10:58
> To: Simpkins, Andy
> Cc: ecos-discuss@sources.redhat.com
> Subject: Re: [ECOS] running code from RAM / Memory Regions
> 
> 
> >>>>> "Simpkins," == Simpkins, Andy 
> <Andy.Simpkins@Transcomm.uk.com> writes:
> 
> Simpkins,> Am I approaching this the write way?  Are there any
> Simpkins,> pitfalls I should watch out for?  Has this already been
> Simpkins,> done (obviously it has) but is the code available?
> 
> Simply mark the function to be located in .2ram and it will
> automagically do the right thing:
> 
> void flash_query(void* data) __attribute__ ((section 
> (".2ram.flash_query")));
> 

this always gives a compiler error : 

 parse error before `{'

when I have the following function

void flash_query(void* data) __attribute__ ((section (".2ram.flash_query")))
{
	// do something
}


> 
> That is, assuming you are using eCos from CVS. Otherwise you'll need
> to hack the arm.ld file so it contains a .data rule like this:

No I am not using a CVS snapshot so shall need the following...
> 
> #define SECTION_data(_region_,  _vma_, _lma_) \
>     .data _vma_ : _lma_ \
>     { __ram_data_start = ABSOLUTE (.); *(.data*) *(.data1) 
> MERGE_IN_RODATA \
>     _GOT1_START_ = ABSOLUTE (.); *(.got1) _GOT1_END_ = ABSOLUTE (.); \
>     _GOT2_START_ = ABSOLUTE (.); *(.got2) _GOT2_END_ = ABSOLUTE (.); \
>     . = ALIGN (4); \
>     KEEP(*( SORT (.ecos.table.*))) ;            \
>     . = ALIGN (4); \
>     __CTOR_LIST__ = ABSOLUTE (.); KEEP (*(SORT (.ctors*))) 
> __CTOR_END__ = ABSOLUTE (.); \
>     __DTOR_LIST__ = ABSOLUTE (.); KEEP (*(SORT (.dtors*))) 
> __DTOR_END__ = ABSOLUTE (.); \
>     *(.dynamic) *(.sdata*) *(.sbss*) \
>     . = ALIGN (4); *(.2ram.*) } \
>     > _region_ \
>     __rom_data_start = LOADADDR (.data); \
>     __ram_data_end = .; PROVIDE (__ram_data_end = .); _edata 
> = .; PROVIDE (edata = .); \
>     PROVIDE (__rom_data_end = LOADADDR (.data) + SIZEOF(.data));


I couldn't use your example directly because I also needed the section for
__DEVTAB__ but have been able to get this part working...

> 
> Cheers,
> Jesper
>