[ECOS] running code from RAM / Memory Regions
Jesper Skov
jskov@redhat.com
Fri Aug 17 02:57:00 GMT 2001
>>>>> "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")));
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:
#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));
Cheers,
Jesper
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