linker file: copy defined section from ROM to RAM

[christophe74]

I'm trying to add a section that will include calibration data stored in data flash and loaded in RAM at startup.

The firmware can modify these data in RAM and erase/program the data flash block with updated values.

So I created these sections in the .lcf file:

GROUP :

    {

      .calibration_dataflash : {}

. = ALIGN (0x4000);

      .fee1_dataflash : {}

. = ALIGN (0x4000);

      .fee2_dataflash2 : {}

. = ALIGN (0x4000);

      .history_dataflash : {}

    } > internal_dataflash

__CALIB_ROM_START = ADDR(.calibration_dataflash);

    GROUP :

    {

      .calibration LOAD(__CALIB_ROM_START):

      {

	. = ALIGN (0x4);
	*(.calibration_data)
	. = ALIGN (0x4);
	*(.calibration_crc)
	. = ALIGN (0x8);

      }

    } > calibration_ram

__CALIB_RAM_START = ADDR(.calibration);

__CALIB_RAM_END = ADDR(.calibration) + SIZEOF(.calibration);

In my header file I defined:

#pragma section  ".calibration"

#define __CALIBRATION __declspec(section ".calibration")

But at compilation I have the following error:

>Linker command file output section '.calibration' has a type or input which

>is incompatible with

>section '.calibration' in file

I searched in many files and discussions but I haven't found the solution. Any idea ?

Environment: CW 10.5 for MPC5604B

[trytohelp]

Bonjour Christophe,

I don't have lot of expertise with MPC5604B processor but I've tried to reproduce the problem  on my side.

I've just created a project with the wizard and added your lcf and source modification in MPC5604B_RAM.lcf and main.c file.

Attached you will find the project added.

Keep in mind I don't try to create a "running code".

Regards

Pascal

[christophe74]

Bonjour Pascal,

Thanks for your answer.

Restarting with your example I finally managed to place my variables a the right address. At least when I check .map file for RAM placement and .mot file for ROM placement.

But I still have a warning at compilation:

=__CALIBRATION uint16_t test1 = 0x2222; 

>'RW' object 'test1' is being put into section '.calibration_data' with access

>permission 'R';

>section's access permission will be changed to 'RW'

If I add (RW) information on calibration_ram line in memory section:

calibration_ram (RW):

org = 0x40005000,   len = 0x00001000 /* 4K */

I got an error:

>':' expected in command file at line '42'.

Does the linker file syntax changed in eclipse ?

And adding the DATA filter type at .calibration line:

      .calibration (DATA) LOAD(__CALIB_ROM_START):

doesn't change anything.

If I ignore the warning and launch a debug session, I got a Codewarrior alert:

Memory area from address 0x00080000 with size c is restricted for write in the memory configuration file.

What do I have to change in lcf file to solve this problem ?

Christophe

[trytohelp]

Hi Christophe,

Can you please provide me your application ?

For details you can refer to the \CW MCU v10.5\MCU\Help\PDF\MCU_Power-Architecture_Compiler.pdf

Pascal

[christophe74]

Hi Pascal,

I solved the warning problem by inserting a RW filter in the pragma line:

#pragma section  RW ".calibration_data"

The codewarrior alert in debug session was due to an invalid address for internal_dataflash in the memory section of .lcf file.

Thanks for your help.

Christophe