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Flash size should be chosen with headroom because

  • A.the code will grow through the product's life
  • B.flash loses capacity as it is erased and rewritten
  • C.the linker cannot use the last quarter of the device
  • D.a bootloader must occupy exactly half the available flash

Answer: A

Field updates, new features and bug fixes all add code, and running out of flash late in a programme forces either a redesign or a painful optimisation. Twenty to thirty per cent spare at first release is a common target.

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