Re: [avr-gcc-list] initialized progmem data at fix address

[Eivind Sivertsen]

Well,
then I think there is something wrong with the makefile you were using.
The .text section should not be moved anywhere unless specifically told so.
And the only reason to do this (or the best reason anyway), would be if 
you're making a bootloader.
Please see if you can start with the attached makefile.

Cheers,
Eivind


> The problem with this is it moves the start of the 'text' section to 
> the place where you want to put the version string.  The flash space
> between 0 and FLASHDATA is not used. 
>
> I was trying to solve this problem once before where I had a company
> 'standard'
> requiring a 16 byte field located at flash address 0x100. 
>
> I declared the section as you suggest but the linker simply starts all
> program storage in flash following the 16 byte field as if the lower 
> 0x100 bytes of flash don't exist. (And are thus "wasted".)
>
> The gcc linker doesn't recognize that a small code module could
> fit in this space.
>
> The IAR EW linker I use at "work", when compiling the same 
> application, has no issues "injecting" this 16 byte section at the
> specified address and 'wrapping' it with initialization code or small
> modules that fit around it.
>
> Has anyone got a gcc linker 'fix' that gets around this problem?
> And of course, I'm no expert, so if I'm doing something wrong, please
> educate me.
>
>
>
>  
>
> > > > Eivind Sivertsen <address@hidden> 04/14/05 3:15 AM >>>
> > > >        
> Hi,
> I dont know if the #pragma option works, but I know you can do this 
> (e.g. in your main .c file):
>
> // 1) Define the segment.
> #define FLASHDATA __attribute__ ((section (".flashdata")))
>
> // 2) Declare the data array.
> const unsigned char data_array[] FLASHDATA = {0xd9, 0xce, 0xe3, ..., 
> ...etc, etc};
>
>
> Then add this linker command under the others in the makefile:
>
> LDFLAGS += -Wl,--section-start=.flashdata=0x1E800
>
>
> Cheers,
> Eivind
>
>
>
>  
>
> > Hi,
> >
> > use: #pragma yoursection="ANYNAME"
> >
> > then in your makefile write:
> > ANYNAME_ADDRESS = 8000
> > LDFLAGS += -Wl,--section-start=.text=$(ANYNAME_ADDRESS)
> >
> > Attention: gcc understands 8000 as BYTE address!
> >
> >
> >
> >    
> >
> > > hi,
> > >
> > > how can i create an initialized progmem data at fix address in
> > >      
> program
>  
>
> > > flash in C?
> > >
> > > ie.: bootloader version number:
> > > uint16_t version;   // at address 0x1E800
> > >
> > > thanks: Andras
> > >
> > >
> > >
> > > _______________________________________________
> > > AVR-GCC-list mailing list
> > > address@hidden 
> > > http://lists.nongnu.org/mailman/listinfo/avr-gcc-list 
> > >   
> > >
> > >      
> > _______________________________________________
> > AVR-GCC-list mailing list
> > address@hidden 
> > http://lists.nongnu.org/mailman/listinfo/avr-gcc-list 
> >
> >
> >
> >    
>
>
>
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>  
# Hey Emacs, this is a -*- makefile -*-
#
# WinAVR Sample makefile written by Eric B. Weddington, Jörg Wunsch, et al.
# Released to the Public Domain
# Please read the make user manual!
#
# Additional material for this makefile was submitted by:
#  Tim Henigan
#  Peter Fleury
#  Reiner Patommel
#  Sander Pool
#  Frederik Rouleau
#  Markus Pfaff
#
# On command line:
#
# make all = Make software.
#
# make clean = Clean out built project files.
#
# make coff = Convert ELF to AVR COFF (for use with AVR Studio 3.x or VMLAB).
#
# make extcoff = Convert ELF to AVR Extended COFF (for use with AVR Studio
#                4.07 or greater).
#
# make program = Download the hex file to the device, using avrdude.  Please
#                customize the avrdude settings below first!
#
# make filename.s = Just compile filename.c into the assembler code only
#
# To rebuild project do "make clean" then "make all".
#


# MCU name
MCU = atmega128

# Output format. (can be srec, ihex, binary)
FORMAT = ihex

# Target file name (without extension).
TARGET = main


# List C source files here. (C dependencies are automatically generated.)
SRC = $(TARGET).c eeprom.c


# List Assembler source files here.
# Make them always end in a capital .S.  Files ending in a lowercase .s
# will not be considered source files but generated files (assembler
# output from the compiler), and will be deleted upon "make clean"!
# Even though the DOS/Win* filesystem matches both .s and .S the same,
# it will preserve the spelling of the filenames, and gcc itself does
# care about how the name is spelled on its command-line.
ASRC = 



# Optimization level, can be [0, 1, 2, 3, s]. 
# 0 = turn off optimization. s = optimize for size.
# (Note: 3 is not always the best optimization level. See avr-libc FAQ.)
OPT = s

# Debugging format.
# Native formats for AVR-GCC's -g are stabs [default], or dwarf-2.
# AVR (extended) COFF requires stabs, plus an avr-objcopy run.
DEBUG = dwarf-2

# List any extra directories to look for include files here.
#     Each directory must be seperated by a space.
EXTRAINCDIRS = 


# Compiler flag to set the C Standard level.
# c89   - "ANSI" C
# gnu89 - c89 plus GCC extensions
# c99   - ISO C99 standard (not yet fully implemented)
# gnu99 - c99 plus GCC extensions
CSTANDARD = -std=gnu99

# Place -D or -U options here
CDEFS =

# Place -I options here
CINCS =


# Compiler flags.
#  -g*:          generate debugging information
#  -O*:          optimization level
#  -f...:        tuning, see GCC manual and avr-libc documentation
#  -Wall...:     warning level
#  -Wa,...:      tell GCC to pass this to the assembler.
#    -adhlns...: create assembler listing
CFLAGS = -g$(DEBUG)
CFLAGS += $(CDEFS) $(CINCS)
CFLAGS += -O$(OPT)
CFLAGS += -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums
CFLAGS += -Wall -Wstrict-prototypes
CFLAGS += -Wa,-adhlns=$(<:.c=.lst)
CFLAGS += $(patsubst %,-I%,$(EXTRAINCDIRS))
CFLAGS += $(CSTANDARD)
CFLAGS += -mcall-prologues 



# Assembler flags.
#  -Wa,...:   tell GCC to pass this to the assembler.
#  -ahlms:    create listing
#  -gstabs:   have the assembler create line number information; note that
#             for use in COFF files, additional information about filenames
#             and function names needs to be present in the assembler source
#             files -- see avr-libc docs [FIXME: not yet described there]
ASFLAGS = -Wa,-adhlns=$(<:.S=.lst),-gstabs 



#Additional libraries.

# Minimalistic printf version
PRINTF_LIB_MIN = -Wl,-u,vfprintf -lprintf_min

# Floating point printf version (requires MATH_LIB = -lm below)
PRINTF_LIB_FLOAT = -Wl,-u,vfprintf -lprintf_flt

PRINTF_LIB = 

# Minimalistic scanf version
SCANF_LIB_MIN = -Wl,-u,vfscanf -lscanf_min

# Floating point + %[ scanf version (requires MATH_LIB = -lm below)
SCANF_LIB_FLOAT = -Wl,-u,vfscanf -lscanf_flt

SCANF_LIB = 

MATH_LIB = -lm

# External memory options

# 64 KB of external RAM, starting after internal RAM (ATmega128!),
# used for variables (.data/.bss) and heap (malloc()).
#EXTMEMOPTS = -Wl,-Tdata=0x801100,--defsym=__heap_end=0x80ffff

# 64 KB of external RAM, starting after internal RAM (ATmega128!),
# only used for heap (malloc()).
#EXTMEMOPTS = -Wl,--defsym=__heap_start=0x801100,--defsym=__heap_end=0x80ffff

EXTMEMOPTS =

# Linker flags.
#  -Wl,...:     tell GCC to pass this to linker.
#    -Map:      create map file
#    --cref:    add cross reference to  map file
LDFLAGS = -Wl,-Map=$(TARGET).map,--cref
LDFLAGS += $(EXTMEMOPTS)
LDFLAGS += $(PRINTF_LIB) $(SCANF_LIB) $(MATH_LIB)
LDFLAGS += -Wl,--section-start=.flashdata=0x1E800



# Programming support using avrdude. Settings and variables.

# Programming hardware: alf avr910 avrisp bascom bsd 
# dt006 pavr picoweb pony-stk200 sp12 stk200 stk500
#
# Type: avrdude -c ?
# to get a full listing.
#
AVRDUDE_PROGRAMMER = stk500

# com1 = serial port. Use lpt1 to connect to parallel port.
AVRDUDE_PORT = com1    # programmer connected to serial device

AVRDUDE_WRITE_FLASH = -U flash:w:$(TARGET).hex
AVRDUDE_WRITE_EEPROM = -U eeprom:w:$(TARGET).eep


# Uncomment the following if you want avrdude's erase cycle counter.
# Note that this counter needs to be initialized first using -Yn,
# see avrdude manual.
#AVRDUDE_ERASE_COUNTER = -y

# Uncomment the following if you do /not/ wish a verification to be
# performed after programming the device.
#AVRDUDE_NO_VERIFY = -V

# Increase verbosity level.  Please use this when submitting bug
# reports about avrdude. See <http://savannah.nongnu.org/projects/avrdude> 
# to submit bug reports.
#AVRDUDE_VERBOSE = -v -v

AVRDUDE_FLAGS = -p $(MCU) -P $(AVRDUDE_PORT) -c $(AVRDUDE_PROGRAMMER)
AVRDUDE_FLAGS += $(AVRDUDE_NO_VERIFY)
AVRDUDE_FLAGS += $(AVRDUDE_VERBOSE)
AVRDUDE_FLAGS += $(AVRDUDE_ERASE_COUNTER)



# ---------------------------------------------------------------------------

# Define directories, if needed.
DIRAVR = c:/winavr
DIRAVRBIN = $(DIRAVR)/bin
DIRAVRUTILS = $(DIRAVR)/utils/bin
DIRINC = .
DIRLIB = $(DIRAVR)/avr/lib
DIROUT = ./Output


# Define programs and commands.
SHELL = sh
CC = $(DIRAVRBIN)/avr-gcc
OBJCOPY = $(DIRAVRBIN)/avr-objcopy
OBJDUMP = $(DIRAVRBIN)/avr-objdump
SIZE = $(DIRAVRBIN)/avr-size
NM = $(DIRAVRBIN)/avr-nm
AVRDUDE = avrdude
REMOVE = rm -f
COPY = cp
MKDIR = $(DIRAVRUTILS)/mkdir


# Define Messages
# English
MSG_ERRORS_NONE = Errors: none
MSG_BEGIN = ----------------------- Clean Up Old Files  
--------------------------
MSG_END   = -----------------------      Finished       
--------------------------
MSG_SIZE_BEFORE = Size before: 
MSG_SIZE_AFTER = Size after:
MSG_COFF = Converting to AVR COFF:
MSG_EXTENDED_COFF = Converting to AVR Extended COFF:
MSG_FLASH = Creating load file for Flash:
MSG_EEPROM = Creating load file for EEPROM:
MSG_EXTENDED_LISTING = Creating Extended Listing:
MSG_SYMBOL_TABLE = Creating Symbol Table:
MSG_LINKING = Linking:
MSG_COMPILING = Compiling:
MSG_ASSEMBLING = Assembling:
MSG_CLEANING = Cleaning project:




# Define all object files.
OBJ = $(SRC:.c=.o) $(ASRC:.S=.o) 

# Define all listing files.
LST = $(ASRC:.S=.lst) $(SRC:.c=.lst)

# Define EEPROM file.
SRC = $(TARGET).c eedata.c


# Compiler flags to generate dependency files.
GENDEPFLAGS = -Wp,-M,-MP,-MT,$(*F).o,-MF,.dep/$(@F).d


# Combine all necessary flags and optional flags.
# Add target processor to flags.
ALL_CFLAGS = -mmcu=$(MCU) -I. $(CFLAGS) $(GENDEPFLAGS)
ALL_ASFLAGS = -mmcu=$(MCU) -I. -x assembler-with-cpp $(ASFLAGS)


# Default target.
all:  begin gccversion sizebefore build sizeafter finished extcoff end
allwithclean:  begin clean gccversion sizebefore build sizeafter finished 
extcoff end

build: elf hex eep lss sym extcoff

elf: $(TARGET).elf
hex: $(TARGET).hex
eep: $(TARGET).eep
lss: $(TARGET).lss 
sym: $(TARGET).sym



# Eye candy.
# AVR Studio 3.x does not check make's exit code but relies on
# the following magic strings to be generated by the compile job.
begin:
        @echo 
        @echo $(MSG_BEGIN)

finished:
        @echo $(MSG_ERRORS_NONE)
        
end:
        @echo $(MSG_END)
        @echo


# Display size of file.
HEXSIZE = $(SIZE) --target=$(FORMAT) $(TARGET).hex
ELFSIZE = $(SIZE) -A $(TARGET).elf
sizebefore:
        @if [ -f $(TARGET).elf ]; then echo; echo $(MSG_SIZE_BEFORE); 
$(ELFSIZE); echo; fi

sizeafter:
        @echo
        @echo
        @echo ............................ FINISHED 
.......................................
        @echo 
-----------------------------------------------------------------------------
        @if [ -f $(TARGET).elf ]; then echo; echo $(MSG_SIZE_AFTER); 
$(ELFSIZE); echo; fi


# Display compiler version information.
gccversion : 
        @echo ............................ Compiling 
......................................
        @echo 
-----------------------------------------------------------------------------
        @$(CC) --version



# Program the device.  
program: $(TARGET).hex $(TARGET).eep
        $(AVRDUDE) $(AVRDUDE_FLAGS) $(AVRDUDE_WRITE_FLASH) 
$(AVRDUDE_WRITE_EEPROM)




# Convert ELF to COFF for use in debugging / simulating in AVR Studio or VMLAB.
COFFCONVERT=$(OBJCOPY) --debugging \
--change-section-address .data-0x800000 \
--change-section-address .bss-0x800000 \
--change-section-address .noinit-0x800000 \
--change-section-address .eeprom-0x810000 


coff: $(TARGET).elf
        @echo
        @echo $(MSG_COFF) $(TARGET).cof
        $(COFFCONVERT) -O coff-avr $< $(TARGET).cof


extcoff: $(TARGET).elf
        @echo
        @echo ....................... Convert to extCoff 
..................................
        @echo 
-----------------------------------------------------------------------------
        @echo
        @echo $(MSG_EXTENDED_COFF) $(TARGET).cof
        $(COFFCONVERT) -O coff-ext-avr $< $(TARGET).cof


# Create final output files (.hex, .eep) from ELF output file.
%.hex: %.elf
        @echo
        @echo $(MSG_FLASH) $@
        # $(OBJCOPY) -O $(FORMAT) -R .eeprom -j .text -j .data -j .calibration 
$< $@
        
        $(OBJCOPY) -O $(FORMAT) -R .eeprom $< $@

# changed the objcopy call above. EAS
        $(OBJCOPY) -O $(FORMAT) -j .eeprom eedata.o eedata.hex
        

%.eep: %.elf
        @echo
        @echo $(MSG_EEPROM) $@
        -$(OBJCOPY) -j .eeprom --set-section-flags=.eeprom="alloc,load" \
        --change-section-lma .eeprom=0 -O $(FORMAT) $< $@

# Create extended listing file from ELF output file.
%.lss: %.elf
        @echo
        @echo $(MSG_EXTENDED_LISTING) $@
        $(OBJDUMP) -h -S $< > $@

# Create a symbol table from ELF output file.
%.sym: %.elf
        @echo
        @echo $(MSG_SYMBOL_TABLE) $@
        $(NM) -n $< > $@



# Link: create ELF output file from object files.
.SECONDARY : $(TARGET).elf
.PRECIOUS : $(OBJ)
%.elf: $(OBJ)
        @echo
        @echo $(MSG_LINKING) $@
        $(CC) $(ALL_CFLAGS) $(OBJ) --output $@ $(LDFLAGS)


# Compile: create object files from C source files.
%.o : %.c
        @echo
        @echo $(MSG_COMPILING) $<
        $(CC) -c $(ALL_CFLAGS) $< -o $@ 


# Compile: create assembler files from C source files.
%.s : %.c
        $(CC) -S $(ALL_CFLAGS) $< -o $@


# Assemble: create object files from assembler source files.
%.o : %.S
        @echo
        @echo $(MSG_ASSEMBLING) $<
        $(CC) -c $(ALL_ASFLAGS) $< -o $@



# Target: clean project.
clean: begin clean_list finished end

clean_list :
        @echo
        @echo $(MSG_CLEANING)
        $(REMOVE) $(TARGET).hex
        $(REMOVE) $(TARGET).eep
        $(REMOVE) $(TARGET).obj
        $(REMOVE) $(TARGET).cof
        $(REMOVE) $(TARGET).elf
        $(REMOVE) $(TARGET).map
        $(REMOVE) $(TARGET).obj
        $(REMOVE) $(TARGET).a90
        $(REMOVE) $(TARGET).sym
        $(REMOVE) $(TARGET).lnk
        $(REMOVE) $(TARGET).lss
        $(REMOVE) $(OBJ)
        $(REMOVE) $(LST)
        $(REMOVE) $(SRC:.c=.s)
        $(REMOVE) $(SRC:.c=.d)
        $(REMOVE) .dep/*
        @echo
        @echo



# Include the dependency files.
-include $(shell mkdir .dep 2>/dev/null) $(wildcard .dep/*)


# Listing of phony targets.
.PHONY : all begin finish end sizebefore sizeafter gccversion \
build elf hex eep lss sym coff extcoff \
clean clean_list program