Segger Embedded Studio Link Errors - Undefined References

Question

First - thanks to those who answered my question about the Segger Embedded Studio code size limit. It appears to have be fixed when I switch the build configuration from "Internal and External" to just "Internal". 
 This question may relate to the SDK rather than the Segger Embedded Studio, but my project did compile, link, and run with IAR and now I am getting these link errors with SES. 
 Linking hm_chair.elf 
 _build/nrf_sdh.o:(.rodata.sdh_req_observers+0x0): undefined reference to `__start_sdh_req_observers' 
 _build/nrf_sdh.o:(.rodata.sdh_req_observers+0x4): undefined reference to `__stop_sdh_req_observers' 
 _build/nrf_sdh.o:(.rodata.sdh_state_observers+0x0): undefined reference to `__start_sdh_state_observers' 
 _build/nrf_sdh.o:(.rodata.sdh_state_observers+0x4): undefined reference to `__stop_sdh_state_observers'

Mike Marks · Accepted Answer

RK Thanks much for the help - I now have a build that links without errors. My confusion was coming from two places. First, the flash_placement.xml I had copied to the code directory was not being used. The Project->Options->Linker-> Section Placement File was actually pointing to a directory a couple layers down in my project source rather than where I might have expected. Modifying that xml file with the two <Program Section...> lines in my post three above this one eliminated the four linker errors. I can now happily build in Segger above the 32K IAR Kickstarter limit, which was my main motivation for evaluating this tool. 
 A second confusion source that held me up longer that I would have liked is that the Project->Options->Section Placement File indicated actually changes once the Import is done. The imported file line was showing a file named "section_placement.xml", and when I couldn't find a file by that name I got further confused.

Segger Embedded Studio Link Errors - Undefined References

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