How to specify an offset within a memory segment in a section placement file?

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Ed Graham

• May 10, 2023 17:30

My solution contains two projects.  I want to specify that they be loaded into different halves of Flash memory. 

I have defined a memory region called FlexSPI that is 64MB in size.  My memory map file looks like this:

<Root name="iMXRT" >
  <MemorySegment name="FlexSPI" start="$(FlexSPISTART:0x60000000)" size="$(FlexSPISIZE:0x04000000)" access="ReadOnly"/>
... other segments ...
</Root>

My first project is a bootloader, which should be loaded into the FlexSPI region at address 0x60000000 (i.e., the beginning).  My placement file for the bootloader looks like this:

<!DOCTYPE Linker_Placement_File>
<Root name="FlexSPI (QuadSPI) Section Placement">
  <MemorySegment name="$(FLASH_NAME:FlexSPI)">
    <ProgramSection load="Yes" name=".fill" size="$(FILLSIZE:0x0)" keep="Yes"/>
... other sections ...
  </MemorySegment>

... other segments ...  

</Root>

My second project is my actual app, which should be loaded into the FlexSPI region at address 0x62000000 (i.e., half-way through).  I tried to avoid using hard-coded addresses and use the macros in calculations like this:

<!DOCTYPE Linker_Placement_File>
<Root name="FlexSPI (QuadSPI) Section Placement">
  <MemorySegment name="$(FLASH_NAME:FlexSPI)">
    <ProgramSection load="Yes" name=".fill" start="$(FlexSPISTART)+$(FlexSPISIZE)/2" size="$(FILLSIZE:0x0)" keep="Yes"/>
... other sections ...
  </MemorySegment>

... other segments ...  

</Root>

However, perhaps predictably, it didn't work.

What is the best way to do this?

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• 

  Jon Elliott

  • May 11, 2023 07:40

  You can set the FlexSPISTART and FlexSPISIZE macros as required for each project using the Code > Linker > Memory Map Macros project property.

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  Ed Graham

  • May 11, 2023 09:06

  Thanks Jon - I've done that now and both projects are now compiled and linked successfully.  However, when trying to download the one that starts at the midpoint address 0x62000000 I get the following error:

  Memory erase operation failed: no driver installed for memory range

  Any ideas?

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  Ed Graham

  • May 11, 2023 11:08

  I've worked this one out now - my FlexSPI memory component wasn't as big as I thought it was!  So the memory addresses I was using were all out of range ... this has now been fixed.

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