crc_table linker command example for MSP430?

If you take out the crc_table linker directives, does it build an executable file?

I tried to reproduce ...

Theodore Witkamp said:

"../lnk_msp430f2619.cmd", line 110: warning #10351-D: crc_table(_crc_table) operator ignored:  linker will only generate a CRC table when creating an executable file

and I cannot.  Please send in your project.

Thanks and regards,

-George

I am using the TMS320F28335 and not the MSP430, so I am not sure if there is a difference.

I add the crc_table linker directive right after the LOAD_SIZE() directive, i.e.

codestart : > BEGIN,
PAGE = 0,
LOAD_SIZE(_codestart_loadsize),
crc_table(_crcTableList, algorithm=CRC32_PRIME)

I did that for each of the sections that required a CRC.

A command at the end of the command file defines where to put the  CRC table in flash, i.e 

.TI.crctab: > FLASHH 

The main.c defines the following extern:

extern CRC_TABLE crcTableList;

Does your code and linker command file have something similar?

Stephen

Attached.

crc.zip

This part of the error diagnostic is correct ...

Theodore Witkamp said:

crc_table(_crc_table) operator ignored

This part is not ...

Theodore Witkamp said:

linker will only generate a CRC table when creating an executable file

You didn't get a CRC table because your application code makes no references to the symbol created by the crc_table operator.  Here is the relevant line from your linker command file (also known as a linker script) ...

   .crcsec	: {main.obj(.text)} crc_table(_crc_table) > FLASH

The symbol "_crc_table" gets created.  Note that, since you build for the newer EABI, you do not need the leading underscore to be able to use the name "crc_table" in the C code.  Write that symbol name the same way in the linker command file and in the C code.

When you build a more substantial example, you will of course refer to the symbol created with the crc_table() operator, and thus you won't see this problem.

As an aside, the 4.4.x tools do not generate that misleading diagnostic.

As for an example to build from ... Look at the Appendix titled CRC Reference Implementation in the MSP430 assembly tools manual.

Thanks and regards,

-George

It still does not work. Here is a summary of my changes and the linker error.

.text : {} crc_table(crctable) > FLASH /* CODE */

.TI.crctab : > FLASH

"../lnk_msp430f2619.cmd", line 110: warning #10351-D: crc_table(crctable) operator ignored: linker will only generate a CRC table when creating an executable file
<Linking>

undefined first referenced
symbol in file
--------- ----------------
crctable ./main.obj

I have also attached the updated project.

5706.crc.zip

thanks