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Memory/Flash RW guidelines

So I am trying to figure out what i do and dont have access to as far as flash and ram is concerned. From the nRF51822 spec it discusses this in general but im finding myself not confident with writing non-violating code since im not sure what memory locations the softdevice and API function use.

nRFgo says the softdevice uses 80kb, but is that exact?, do i assume its the first 80kb's of the flash? Where is program code, above or below the softdevice. Im sure there is some document im missing but cant seem to recall seeing it.

There is also the issue of setting up a project and defining ROM and RW memory areas via the Target Options Menu. Ive had problems with programming the eval board because these were wrong before.

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