I am a little confused by the results that I get when I use the dimensional tool utility (Yagarto and codeourcery). it reports that I use 0 bytes in the data section. see below
$ arm-none-eabi-size.exe rest-server-example.crazy-horse.elf
text data bss dec hex filename
79364 0 34288 113652 1bbf4 rest-server-example.crazy-horse.elf
I know that my code uses and initializes variables of static RAM to values other than 0.
interestingly enough when I pass the size tool directly to some related object files. I see a data section report.
Example:
text data bss dec hex filename
1648 0 20 1668 684 obj_crazy-horse/uip-nd6.o
200 12 2652 2864 b30 obj_crazy-horse/uip-packetqueue.o
12 0 0 12 c obj_crazy-horse/uip-split.o
1816 24 48 1888 760 obj_crazy-horse/usb-core.o
284 0 0 284 11c obj_crazy-horse/usb-interrupt.o
2064 20 188 2272 8e0 obj_crazy-horse/xmac.o
Why does the elf file report 0 for the .data section when the object files that make it report non-zero values?
FYI I am working on firmware for the AT91SAM7x256 Micro
edit:
adding CFLAGS and LDFLAGS
CFLAGS += -O -DRUN_AS_SYSTEM -DROM_RUN -ffunction-sections
LDFLAGS += -L $(CPU_DIRECTORY) -T $(LINKERSCRIPT) -nostartfiles -Wl,-Map,$(TARGET).map
edit # 2:
, .data , , -
objdump
, , - . , .
edit 3:
, , - .datap >
$ arm-none-eabi-size.exe -A -t -x rest-server-example.crazy-horse.elf
rest-server-example.crazy-horse.elf :
section size addr
.vectrom 0x34 0x100000
.text 0x10fc8 0x100038
.rodata 0x149c 0x111000
.ARM.extab 0x30 0x11249c
.ARM.exidx 0xe0 0x1124cc
.data 0x1028 0x200000
.bss 0x7bec 0x201028
.stack 0xa08 0x20f5f8
.ARM.attributes 0x32 0x0
.comment 0x11 0x0
.debug_aranges 0xc68 0x0
.debug_info 0x2b87e 0x0
.debug_abbrev 0x960b 0x0
.debug_line 0x9bcb 0x0
.debug_frame 0x4918 0x0
.debug_str 0x831d 0x0
.debug_loc 0x13fad 0x0
.debug_ranges 0x620 0x0
Total 0x7c4c5