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sept
Sept is a payload that facilitates booting Atmosphère when targeting firmware version 7.0.0+.
It consists of a primary and a secondary payload.
sept-primary
sept-primary is essentially a stand-in for Nintendo's package1ldr, on 7.0.0+. To use it, the caller (normally fusée-secondary) loads the sept-primary binary to 0x4003F000, loads the 7.0.0+ TSEC firmware to 0x40010F00, and loads a signed, encrypted payload to 0x40016FE0.
This signed, encrypted payload is normally sept-secondary.
sept-secondary
sept-secondary is a payload that performs 7.0.0+ key derivation, and then chainloads to sept/payload.bin.
It is normally stored encrypted/signed. Therefore, if one wishes to build sept-secondary instead of using release builds, one must bring their own keys.