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linker: move last section id constant to c-code

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Move creation of last section id from ld linker script LONG() usage to
C code with last section attribute.

The use of `LONG()` works correctly with ld but lld emits a warning
because .last_section section is not allocated as there are no matching
input sections and discards the `LONG()` call, meaning the last section
identifier will not be present in the flash.
> ld.lld: warning: ignoring memory region assignment for
>                             non-allocatable section '.last_section'

Placing the last section id in `.last_section` in C code makes lld
allocate the memory for the id and thereby create the output section
with the correct output.

Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>
This commit is contained in:
Torsten Rasmussen 2025-04-23 15:07:12 +02:00 • committed by Benjamin Cabé
commit c79c4ef9a8
8 changed files with 30 additions and 30 deletions
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8
soc/andestech/ae350/linker.ld
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@ -421,11 +421,9 @@ GROUP_END(DTCM)
/* Must be last in romable region */
SECTION_PROLOGUE(.last_section,,)
{
#ifdef CONFIG_LINKER_LAST_SECTION_ID
/* Fill last section with a word to ensure location counter and actual rom
* region data usage match. */
LONG(CONFIG_LINKER_LAST_SECTION_ID_PATTERN)
#endif
/* .last_section contains a fixed word to ensure location counter and actual
* rom region data usage match when CONFIG_LINKER_LAST_SECTION_ID=y. */
KEEP(*(.last_section))
} GROUP_LINK_IN(ROMABLE_REGION)
/* Because ROMABLE_REGION != RAMABLE_REGION in XIP-system, it is valid