Atmosphere/docs/components/sept.md

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.