About section placement of "SEGGER Embedded Studio"

RE: About section placement of "SEGGER Embedded Studio"

takashina hiroki — Wed, 25 Sep 2019 04:20:26 GMT

By setting keep = "Yes" load = "Yes", it was possible to place in the section.
Thank you for answering.

RE: About section placement of "SEGGER Embedded Studio"

Simonr — Wed, 18 Sep 2019 11:37:52 GMT

First of all, I see that you've set load="No" where this should be Yes when storing to flash.

You can use one of our DFU examples as a reference to see how for example the bootloader is set up to start in the correct flash address. The flash placement file for one of the DFU examples can be found in this path: ..\nRF5_SDK_15.3.0_59ac345\examples\dfu\open_bootloader\pca10056_usb\ses\flash_placement.xml

Best regards,

Simon

RE: About section placement of "SEGGER Embedded Studio"

takashina hiroki — Wed, 18 Sep 2019 02:43:28 GMT

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.

RE: About section placement of "SEGGER Embedded Studio"

takashina hiroki — Tue, 17 Sep 2019 22:49:11 GMT

Thank you for answering.
I will check it.

RE: About section placement of "SEGGER Embedded Studio"

Simonr — Tue, 17 Sep 2019 12:04:42 GMT

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

Best regards,

Simon