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Here are some resources for understanding flash on 28x devices:
C2000 Flash Issues and Frequently Asked Questions Wiki:
http://tiexpressdsp.com/index.php/C2000_Flash_Common_Issues/FAQs
Application Notes:
Flash Programming Solutions for the TMS320F28xxx DSCs (http://www-s.ti.com/sc/techlit/spraal3)
Running an Application from Internal Flash Memory on the TMS320F28xx DSP (http://www-s.ti.com/sc/techlit/spra958)
Copying Compiler Sections from Flash to RAM on the TMS320F28xxx DSCs (http://www-s.ti.com/sc/techlit/spraau8)
TMS320F281x Boot ROM Serial Flash Programming (http://www-s.ti.com/sc/techlit/spraaq2)
Understanding Flash Programming (sprb169)