Installed into the first 0x4000 sector of the eMMC storage's BCPKG2 partitions, "BootConfig" contains data used to configure TrustZone/OS behaviors.
BootConfig is normally all-zero for retail units, however TrustZone additionally sets the loaded configuration to all-zero when running on a retail unit anyway.
Format
Despite having 0x4000 for storage, the actual loaded BootConfig is only 0x400 bytes, with the following format:
| Offset | Size | Description |
|---|---|---|
| 0x0 | 0x200 | #Unsigned Configuration |
| 0x200 | 0x100 | RSA-PSS Signature |
| 0x300 | 0x100 | #Signed Configuration |
Unsigned Configuration
This is "nn::bconfig::BootConfig".
| Offset | Size | Description |
|---|---|---|
| 0x0 | 0x4 | Version (yyMMddHHmm in uint32) |
| 0x4 | 0xC | Reserved |
| 0x10 | 0x1 | IsDebugMode (bit 1) and TakeExtabtSerrorToEl3 (bit 2) |
| 0x11 | 0x1 | KernelConfiguration (first byte) |
| 0x12 | 0xF | Reserved |
| 0x21 | 0x1 | KernelConfiguration (second byte) |
| 0x22 | 0x1 | Reserved |
| 0x23 | 0x1 | MemoryMode |
| 0x24 | 0x1 | HasInitialTscValue |
| 0x25 | 0xB | Reserved |
| 0x30 | 0x8 | InitialTscValue |
| 0x38 | 0x1C8 | Reserved |
Signed Configuration
| Offset | Size | Description |
|---|---|---|
| 0x0 | 0x8 | Version |
| 0x8 | 0x1 | IsPackage2Plaintext (bit 0) and IsPackage2Unsigned (bit 1) |
| 0x9 | 0x7 | Reserved |
| 0x10 | 0x10 | HardwareInfo (must match the HardwareInfo read from fuses, or else the loaded Signed Config will be memset to 0 even if signed; this allows Nintendo to set signed configuration on a per-unit basis) |
| 0x20 | 0x1 | DisableProgramVerification (controls the default value for how to check NCA signatures) |
| 0x21 | 0xDF | Reserved |