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TMS320F28388D: f28338d bootloader question

Part Number: TMS320F28388D


Hello.
Question about Bootloader. (for F28388D)

1. Why can I manipulate the flash only when the program is running in RAM?
    When a program runs in Flash, isn't it possible to manipulate other unused sectors?

2. I'm doing a firmware update using c2prog.
    c2prog supports both cpu1, cpu2 and cm.
    SCI is not connected to CM on Functional Block Diagram, but I would like to know why CM firmware update is possible in SCI BOOT mode.
    (IPC from BOOT ROM? or IPC from flash kernel? or other methods?)

Thank you.