About section placement of "SEGGER Embedded Studio"

[takashina hiroki]

I have a question about "SEGGER Embedded Studio for ARM V4.12".

I want to place the section of the FLASH area arbitrarily.
And, for example, I want to place the following constants in that section.
(For example, 0x77FF0 to 0x77FF2 section layout)

const uint8_t table_data [3] = {1, 2, 3};

Please tell me how.

[Simonr]

Hi

Please check out this post, where a SEGGER employee describes how to do just that.

Best regards,

Simon

[takashina hiroki]

Thank you for answering.
I will check it.

[takashina hiroki]

I changed "flash_placement.xml" as follows.

<!DOCTYPE Linker_Placement_File>
<Root name="Flash Section Placement">
  <MemorySegment name="FLASH" start="$(FLASH_PH_START)" size="$(FLASH_PH_SIZE)">
    <ProgramSection load="no" name=".reserved_flash" start="$(FLASH_PH_START)" size="$(FLASH_START)-$(FLASH_PH_START)" />
    [...]
	<ProgramSection alignment="4" load="No" name=".sp_flash" start="0x00077FF6" size="0x00000006" />
  </MemorySegment>
  <MemorySegment name="RAM" start="$(RAM_PH_START)" size="$(RAM_PH_SIZE)">
    [...]
  </MemorySegment>
</Root>

In addition, I added the following processing.

const uint8_t flash_test[1] __attribute__((section (".sp_flash"))) __attribute__((used)) = {0xBC};

I thought "0xBA" was written at the address 0x00077FF6.
However, I confirmed that it was not written at that address.

Please tell me the cause and countermeasures.