ESP32 Forum

Posted: **Fri Dec 06, 2024 9:08 am**

Hi, I wanted to create a section in flash.rodata called y_table and place a symbol of the same name (y_table) into it.

So I created a .lf file with the following contents and added it to the LDFRAGMENTS-part of idf_component_register:

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[sections:y_table]
entries:
  .y_table+

[scheme:rodata_table]
entries:
  y_table -> flash_rodata

[mapping:table]
archive: archive
entries:
  table:y_table (rodata_table)

And my variable declaration in "table.cpp" is:

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table_t __attribute__(( section( ".flash.rodata.y_table" ) )) const y_table = {...};

However, this does not work, the result in the *.map file is:

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                0x3c0e0120                        . = ALIGN (ALIGNOF (.flash.rodata))
                0x00000000                        ASSERT ((ADDR (.flash.rodata) == (ADDR (.flash.appdesc) + SIZEOF (.flash.appdesc))), The gap between .flash.appdesc and .flash.rodata must not exist to produce the final bin image.)

.flash.rodata.y_table
                0x3c0e0120       0x50
 .flash.rodata.y_table
                0x3c0e0120       0x50 esp-idf/VOS/libVOS.a(table.cpp.obj)
                0x3c0e0120                y_table

.flash.rodata   0x3c0e0170    0x44a28

and the assert triggers.

I have tried changing the "archive: archive" part of the .lf File to "archive: libVOS.a" (VOS is the component which includes the fragment and table.cpp), but this results in a parsing error (which I don't understand, as I thought the two statements should have the same effect).

I also tried changing the entries in the sections fragment from ".y_table+" to ".flash.rodata.y_table+", but that did not change anything either.

Can somebody help me find out what I am doing wrong?

ESP32 Forum

Creating section via Linker-Fragment does not work for me

Creating section via Linker-Fragment does not work for me