Locating _c_int00 in a fixed position in memory

Hello,

I moved this into the Code Composer Studio forum, as I believe they will have more expertise on this specific question.

--Bobby

Susie Johnson said:

  .text:_c_int00 > 0x30000

That doesn't work because that section name is not used in the ARM compiler RTS library boot routine.  Instead, you need to adapt a technique described in this wiki article.

First, you need to know the exact name of the RTS library you are using.  That library is often chosen automatically.  Here is one way to find the name.

% find "rts" file.map

---------- FILE.MAP
00000020 00000102 rtsv7M4_T_be_v4SPD16_eabi.lib : ctype.obj (.const:.string:_ctypes_)
00001000 00000048 rtsv7M4_T_be_v4SPD16_eabi.lib : boot.obj (.text)
...

Replace file.map with the name of your map file.  If you are building with CCS, the map file is usually located in project_directory\debug.  (If necessary, change debug to the name of your build configuration.)  

That rts_something.lib is the name of your RTS library.  In your linker command file add something similar to ...

    boot_section > 0x30000
    {
      -l rtsv7M4_T_be_v4SPD16_eabi.lib<boot.obj>(.text)
    }

Thanks and regards,

-George

Thanks George. 

 I modified my file but it didn't work.  I got this warning:

"No matching section." 

Here is the snippet of code from the .cmd file.  I'm sure I did something wrong but don't know what.

/* Section allocation in memory */

SECTIONS

{

    .intvecs:   > APP_BASE

.text   :   > FLASH

.const  :   > FLASH

.cinit  :   > FLASH

.pinit  :   > FLASH

.init_array : > FLASH

.vtable :   > RAM_BASE

.data   :   > SRAM

.bss    :   > SRAM

.sysmem :   > SRAM

 .stack  :   > SRAM

    boot_section > 0x30000

    {

        -l rtsv7M4_T_le_v4SPD16_eabi.lib<boot.obj>(.text)

    }   

UNION

    {

     GROUP

        {

            .blFlash: {  blFlash.obj (

.text)  }

        }  load = FLASH, table(_blFlash_copy_table)

    }  run = SRAM

    .ovly: > FLASH

}

Thanks,

Susie

Susie Johnson said:

     -l rtsv7M4_T_le_v4SPD16_eabi.lib<boot.obj>(.text)

This library name has to exactly match the RTS library you are using.  I showed you how to see the name of that library using the map file from the earlier successful link.  Change this RTS library name to the one you are using.

Thanks and regards,

-George

The name of the library is rtsv7M4_T_le_v4SPD16_eabi.lib.  I don't know why it was underlined above.  So the exact line I have in my file is:

-l rtsv7M4_T_le_v4SPD16_eabi.lib<boot.obj>(.text)

I found where the section on the linker "Specifying Library or Archive Members as Input to Output Sections" and it uses and equal sign after the -l:

-l=rtsv7M4_T_le_v4SPD16_eabi.lib<boot.obj>(.text)

I tried this but it didn't work either.  I have attached a screen shot of the warning.

Best regards,

Susie

Try moving the boot_section lines to the beginning of the SECTIONS directive.  Please let me know if that works.

Thanks and regards,

-George 

I moved it to the top of the SECTIONS directive and it still gives me the same warning and does not locate boot.bin at the specified address.

Thanks,

Susie

Remove the "-l" or "-l=" in the linker command file; it is unnecessary and it is not recognized in older compiler versions.

Removed the "-l" did a clean and rebuilt the whole application and still have the same warning and the position of boot.obj is still in the same place -- it did not relocate to the specified memory location.

Thanks,

Susie

I am out of suggestions at this point.  Please show exactly how the linker is invoked, and post the map file.  There might be a useful clue there.

Thanks and regards,

-George

From the build console:

'Invoking: TMS470 Linker'

"C:/ti/ccsv5/tools/compiler/tms470_4.9.1/bin/cl470" -mv7M4 --code_state=16 --float_support=FPv4SPD16 --abi=eabi -me -g --gcc --define=ccs --define=PART_LM4F232H5QD --define=TARGET_IS_BLIZZARD_RA1 --diag_warning=225 --gen_func_subsections=on --ual -z --stack_size=9216 -m"LM4F112H5QD.map" --heap_size=0 -i"C:/ti/ccsv5/tools/compiler/tms470_4.9.1/lib" -i"C:/ti/ccsv5/tools/compiler/tms470_4.9.1/include" --reread_libs --warn_sections --rom_model -o "LM4F112H5QD.out"  "./util.obj" "./usb.obj" "./uSecTimer.obj" "./systemTick.obj" "./stellarisComm.obj" "./startup_ccs.obj" "./relay.obj" "./poe.obj" "./menu.obj" "./led.obj" "./lcd.obj" "./irRx.obj" "./ir.obj" "./io.obj" "./fpb.obj" "./esw.obj" "./comm.obj" "./button.obj" "./blFlash.obj" "./ax.obj" "./app.obj" "./SOMspi.obj" "./LM4F112H5QD.obj" "./Eeprom.obj" -l"libc.a" -l"C:/StellarisWare/boards/ek-lm4f232/hello/ccs/../../../../driverlib/ccs-cm4f/Debug/driverlib-cm4f.lib" -l"C:/StellarisWare/boards/ek-lm4f232/hello/ccs/../../../../grlib/ccs-cm4f/Debug/grlib-cm4f.lib" "../LM4F112H5QD_ccs.cmd"

<Linking>

"../LM4F112H5QD_ccs.cmd", line 58: warning: no matching section

Zipped .map file:

4760.LM4F112H5QD.zip

Thanks,

Susie

Hi George,

I got side-tracked for a few weeks bit I've finally updated my compiler and it fixed the problem.  Thanks so much!

Susie