warning: no matching section.... bzzzzzzzzzzzzt!

MATT GESSNER

I have an assembly file, called mmcload.asm:

            .text
            .def mmcload
mmcload:
            ldr        pc, lc_int00

            .ref    _c_int00
lc_int00:
            .word    _c_int00

In my linker file, I have the following:

MEMORY
{
   shared_ram:      ORIGIN = 0x40200000 LENGTH = 0x00000FFFF
}

SECTIONS
{
   .text: align=4
   {
           mmcload.obj(.text)
           *(.text)
   } > shared_ram
   .const: align=4      > shared_ram
   .data: align=4       > shared_ram
   .sysmem: align=4     > shared_ram
   .bss: align=4, fill=0x00000000        > shared_ram
}

Yet I get:

line 12: warning: no matching section

Anyone have any ideas why this is an error? It sure seems clear to me.

Thanks,

Matt

over 15 years ago

0 AartiG over 15 years ago

TI__Guru**** 173310 points

Matt,

Which one is line 12 in your linker command file? Is it the line specifying *(.text)? Is mmcload.obj the only object file in your link? If so then there are likely no more .text sections so there is nothing to match the *(.text) specification, which in turn generates the warning.

0 MATT GESSNER over 15 years ago in reply to AartiG

Expert 1435 points

Hi,

Line 12 is the "mmcload.obj(.text)" line.

And the file mmcload.obj is there along with all the other (about 4) .obj files.

Matt

0 AartiG over 15 years ago in reply to MATT GESSNER

TI__Guru**** 173310 points

Are you building for EABI? If so, all sections are eligible for removal via conditional linking by default. If a section is not referenced elsewhere in the code, it will be removed. I believe that is what is happening here with the .text section in mmcload.asm. The link map file generated should confirm that there is no mmcload.obj(.text) section.

There are a couple of ways to make sure these sections are explicitly retained:
- using the .retain assembler directive
- using the --retain=mmcload linker option

Please take a look at this article for more details: http://processors.wiki.ti.com/index.php/C6000_EABI_Migration#Conditional_Linking_Feature

0 MATT GESSNER over 15 years ago in reply to MATT GESSNER

Expert 1435 points

Never mind... in spite of the lack of help, I've solved the problem myself.

0 Brad Griffis over 15 years ago in reply to MATT GESSNER

TI__Guru*** 125430 points

Thanks for letting us know the problem is solved. It might be helpful to others in the future if you also post the cause of the issue.

Best regards,
Brad

0 MATT GESSNER over 15 years ago in reply to Brad Griffis

Expert 1435 points

I changed the starting point with the -e option to the linker.

I didn't see Aarti's response to use .retain, which would have done what I wanted as well.

That wouldn't have done what I wanted, though, because program start should be mmcload to begin with.

I suppressed the warning that _c_int00 was the starting address; I know.

Aarti, thank you for your last reply.

Matt

0 MATT GESSNER over 15 years ago in reply to AartiG

Expert 1435 points

When I use .retain, as in this example:

            .sect    ".mlo"

mlolen:        .word    0x00000000
loadaddr:    .word    0x40200000

            .retain ".mlo"

in mmcload.asm, I get the following error:

"../mmcload.asm", ERROR! at line 12: [E0002] Illegal mnemonic specified
.retain ".mlo"

Any ideas?

0 AartiG over 15 years ago in reply to MATT GESSNER

TI__Guru**** 173310 points

As mentioned in this other post, the ARM CGT v4.6.x does not support the .retain assembler directive but does support the --retain linker option. The next production release of the ARM CGT scheduled for later this month should support the .retain directive also.

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warning: no matching section.... bzzzzzzzzzzzzt!