Reply by ●February 23, 20052005-02-23

Hi

I use Metroweks Codewarrior for 5249. I used the default memory configuration generated by the compiler. In that my code was positioned in SDRAM, which causes memory stalls for instructions. For eg: a MAC takes 8 cycles to execute.

I tried positioning my code in SRAM, but it simply isn't running. I'm copying the linker command file I used to run the code. Somebody plz help me out.

LINKER COMMAND FILE
**************************************************************************

MEMORY {

sdram (RWX) : ORIGIN = 0x00000000, LENGTH = 0x00800000
vector_ram (RWX) : ORIGIN = 0x00000000, LENGTH = 0x00000400
user (RWX) : ORIGIN = 0x20002000, LENGTH = 0x00005000
mbar (RWX) : ORIGIN = 0x10000000, LENGTH = 0x00000500
sram0 (RWX) : ORIGIN = 0x20000000, LENGTH = 0x00010000
sram1 (RWX) : ORIGIN = 0x20010000, LENGTH = 0x00008000
mbar2 (RWX) : ORIGIN = 0x80000000, LENGTH = 0x40000000 }

SECTIONS {

.sdram : {} > sdram
.mbar : {} > mbar
.mbar2 : {} > mbar2
.sram0 : {} > sram0
.sram1 : {} > sram1 .vector_ram : {} > vector_ram

.vectors :
{
# vectors.s (.text)
. = ALIGN (0x4);
} > user

.text :
{
. = ALIGN (0x4);
*(.text)
. = ALIGN (0x4);
*(.rodata)
. = ALIGN (0x4);
} >> user

.data :
{
___DATA_ROM = .;
___DATA_RAM = .;
__START_DATA = .;

*(.data)
. = ALIGN (0x4);
__END_DATA = .;

__START_SDATA = .;
*(.sdata)
. = ALIGN (0x4);
__END_SDATA = .;

__SDA_BASE = .;
. = ALIGN (0x4);
} >> user

.bss :
{ __START_SBSS = .;
*(.sbss)
. = ALIGN (0x4);
*(SCOMMON)
__END_SBSS = .;

__START_BSS = .;
*(.bss)
. = ALIGN (0x4);
*(COMMON)
__END_BSS = .;

. = ALIGN(0x4);

} >> user

.custom :
{

___HEAP_START = .;
___HEAP_END = ___HEAP_START + 0x5000;
___SP_END = ___HEAP_END;
___SP_INIT = ___SP_END + 0x1000;

. = ALIGN (0x4);
} >> user
___MBAR = ADDR(.mbar);
___MBAR2 = ADDR(.mbar2);
___SDRAM = ADDR(.sdram);
___SRAM0 = ADDR(.sram0);
___SRAM1 = ADDR(.sram1); ___VECTOR_RAM = ADDR(.vector_ram);

__SP_INIT = ___SP_INIT;
___heap_addr = ___HEAP_START;
___heap_size = 0x5000;
__S_romp = 0x0; }

**************************************************************************

Ramkumar