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Can contiguous Flash blocks be combined (linker command file, F28335)?

Johannes von Löwis
Expert 1786 points

In the linker command file I'm using I found the comment:

          Contiguous SARAM memory blocks can be combined
          if required to create a larger memory block.

Can I do the same with FLASH blocks? I.e., can I put the following line in the linker command file:

   FLASHHG     : origin = 0x300000, length = 0x010000     /* on-chip FLASH */

and then use that block to allocate code and const data sections?

Btw., it appears to work, but I want to make sure it is safe to do so. For example, I'm not sure whether it is a problem when a two-word instruction crosses a FLASH block boundary.

Thanks in advance

Johannes

  • TI__Guru* 91275 points

     Yup, you can.  On the flash side, the thing to keep in mind is a sector is the smallest amount of flash that can be erased at a time.  Thus you may want to partition your code such that code you upgrade (or don't upgrade) aligns to a sector.  

     On the SARAM side, the thing to remember is the SARAM blocks are single access.  So it is best to partition code into a different physical SARAM block than data that code is accessing - this will improve performance.

    -Lori 

  • in reply to Lori Heustess
    Expert 1786 points

     Thank you, Lori.

     Johannes