SES: SDK12.2.0: undefined reference to __SRAM_segment_end__

[Erlend]

Earlier (couple of months) I was working on the examples/peripheral/ppi example in SDK12.2.0. I converted the Keil project inside pca10028/blank/arm5_no_packs to a Segger Embedded Studio project and made it run. Project file here. However now I try to compile, flash and debug the program. At first I had strange behaviour due to the default memory map for ARM (samples/MemoryMap_ARM.xml in the SES install directory) signifying Flash and RAM size both 0. I changed to this memory map.

Next, I get the error undefined reference to '__SRAM_segment_end__ in SDK12.2.0/components/toolchain/embedded_studio/ses_nrf51_startup.s (shown here), on line 108.

I didn't change anything in the project or in the SES install directory since the last time I tried to run it (couple of months), successfully.

Any idea how to fix this?

[bjorn-spockeli]

You just have to change the MemorySegment name from RAM to SRAM, i.e. need to correct the memory map to the following

<!DOCTYPE Board_Memory_Definition_File>
<root name="nRF51422_xxAC">
  <MemorySegment name="FLASH" start="0x00000000" size="0x00040000" access="ReadOnly" />
  <MemorySegment name="SRAM" start="0x20000000" size="0x00008000" access="Read/Write" />
</root>

[suvarna_kadam]

Hi bjorn

I am trying to build ble_app_uart example of sdk 12.3 for pca10028. I am facing the same problem and I am not able to getting your solution.

In which file I need to do given above changes?

Can you please guide with exact file name?

[bjorn-spockeli]

The changes need to be done in the MemoryMap file that is set in the Project Settings under Code > Build > Memory Map File.

Alternatively you can use the Code > Build > Memory Segments to define the Memory Segments instead of creating a dedicated Memory Map file. This is what we do today in our latest SDK. 

Make sure that you follow this guide to the letter wen using older SDKs that does not have native SES support. 

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