ARM AT9260 + data na SDRAM

Čaute,
vedeli by ste mi prosím poradiť, ako dostať v AT9260 dáta na SDRAM-ku (adresa 0x200000)? Čítal som nejaké matroše okolo nastavenia lds skriptu, ale nejako mi to nefunguje… akonahle zadam adresu -Tdata 0x20000000, tak mi program po kompiláci nefunguje.

moj Makefile:

[code]ifndef ERASE_FCT
ERASE_FCT=rm -f
endif
ifndef CROSS_COMPILE
CROSS_COMPILE=arm-elf-
endif

TOOLCHAIN=gcc

OUTFILE_SDRAM=at91sam9260_getting_started_sdram

INCL=./include

Comment the line below for debug mode

#OPTIM=-Os

ifeq ($(TOOLCHAIN), gcc)

AS=$(CROSS_COMPILE)gcc
CC=$(CROSS_COMPILE)gcc
LD=$(CROSS_COMPILE)gcc
NM= $(CROSS_COMPILE)nm
SIZE=$(CROSS_COMPILE)size
OBJCOPY=$(CROSS_COMPILE)objcopy
OBJDUMP=$(CROSS_COMPILE)objdump
CCFLAGS=-g -mcpu=arm9 $(OPTIM) -Wall -I$(INCL)
ASFLAGS=-D__ASSEMBLY__ -g -mcpu=arm9 -c $(OPTIM) -Wall -I$(INCL)

Linker flags.

-Wl,…: tell GCC to pass this to linker.

-Map: create map file

–cref: add cross reference to map file

-lc : tells the linker to tie in newlib

-lgcc : tells the linker to tie in newlib

LDFLAGS+=-nostartfiles -Wl,–cref
LDFLAGS+=-lc -lgcc
LDFLAGS+=-T elf32-littlearm.lds
OBJS=cstartup.o
endif

OBJS+= lowlevel.o
main.o

rebuild: clean all

all: sdram

sdram: $(OBJS)
$(LD) $(LDFLAGS) -Ttext 0x20000000 -Tdata 0x200000 -n -o $(OUTFILE_SDRAM).elf $(OBJS)
$(OBJCOPY) --strip-debug --strip-unneeded $(OUTFILE_SDRAM).elf -O binary $(OUTFILE_SDRAM).bin

main.o: main.c
$(CC) -c $(CCFLAGS) main.c -o main.o

lowlevel.o: lowlevel.c
$(CC) -c $(CCFLAGS) lowlevel.c -o lowlevel.o

emac.o: emac.c
$(CC) -c $(CCFLAGS) emac.c -o emac.o

cstartup.o: cstartup.S
$(AS) $(ASFLAGS) cstartup.S -o cstartup.o

clean:
$(ERASE_FCT) *.o *.bin *.elf *.map
[/code]

.lds subor:

OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm")
OUTPUT_ARCH(arm)
ENTRY(reset_handler)

/*#include "project.h"*/


SECTIONS
{
	.text : { 
		_stext = .;
		*(.text)
		*(.rodata)                 /* read-only data (constants) */
		*(.rodata*)
		. = ALIGN(4);
 		_etext = . ;
	}

	/* collect all initialized .data sections that go into FLASH  */
	.data : AT ( ADDR (.text) + SIZEOF (.text) ) { 
		_sdata = .;
		*(.vectors)
		*(.data)
		_edata = .;
	}

	/* collect all uninitialized .bss sections that go into FLASH  */
	.bss (NOLOAD) : { 
		. = ALIGN(4);
		_sbss = .;
		*(.bss)
		_ebss = .;
	}
		/* koli problemu pri kompilacii */
	/DISCARD/ :
    {
        *(.eh_*)
    }
}
end = .;

za každú radu vopred vďaka.

V makefilu dáváte sekci kódu do SDRAM a data do SRAM.