Andrew Lunn ?????:
The .data segment is your problem. It is much higher in memory, so
objdump is putting 0's in the middle.
You might have a RAM application which you are trying to ROM? Or your
ROM linker scripts are broken.
Andrew
Thanks, Andrew, for help.
Problem was in linker script.
Data and bss sections were defined
SECTION_got (flash, ALIGN (0x8), LMA_EQ_VMA)
SECTION_sram (sram, 0x20000400, LMA_EQ_VMA)
SECTION_data (sram, ALIGN (0x8), LMA_EQ_VMA)
SECTION_bss (sram, ALIGN (0x8), LMA_EQ_VMA)
I've changed it to
SECTION_got (flash, ALIGN (0x8), LMA_EQ_VMA)
SECTION_sram (sram, 0x20000400, FOLLOWING (.got))
SECTION_data (sram, ALIGN (0x8), FOLLOWING (.sram))
SECTION_bss (sram, ALIGN (0x8), LMA_EQ_VMA)
But I'm not sure if it is completely correct.
Whole script(20k sram, 128k flash):
// eCos memory layout
#include <pkgconf/hal.h>
#include <cyg/infra/cyg_type.inc>
MEMORY
{
sram : ORIGIN = 0x20000000, LENGTH =
0x00005000-CYGNUM_HAL_COMMON_INTERRUPTS_STACK_SIZE
flash : ORIGIN = 0x08000000, LENGTH = 0x00020000
}
SECTIONS
{
SECTIONS_BEGIN
SECTION_rom_vectors (flash, 0x08000000, LMA_EQ_VMA)
SECTION_RELOCS (flash, ALIGN (0x8), LMA_EQ_VMA)
SECTION_text (flash, ALIGN (0x8), LMA_EQ_VMA)
SECTION_fini (flash, ALIGN (0x8), LMA_EQ_VMA)
SECTION_rodata (flash, ALIGN (0x8), LMA_EQ_VMA)
SECTION_rodata1 (flash, ALIGN (0x8), LMA_EQ_VMA)
SECTION_fixup (flash, ALIGN (0x8), LMA_EQ_VMA)
SECTION_gcc_except_table (flash, ALIGN (0x8), LMA_EQ_VMA)
SECTION_eh_frame (flash, ALIGN (0x8), LMA_EQ_VMA)
SECTION_got (flash, ALIGN (0x8), LMA_EQ_VMA)
SECTION_sram (sram, 0x20000400, FOLLOWING (.got))
SECTION_data (sram, ALIGN (0x8), FOLLOWING (.sram))
SECTION_bss (sram, ALIGN (0x8), LMA_EQ_VMA)
CYG_LABEL_DEFN(__heap1) = ALIGN (0x8);
SECTIONS_END
}
hal_vsr_table = 0x20000000;
hal_virtual_vector_table = hal_vsr_table + 128*4;
hal_startup_stack = 0x20000000 + 1024*20;
Max
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