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→Format
All of the hashes stored in this NCCH header are over the cleartext data. The ExeFS/RomFS superblock starts at offset 0x0 in the ExeFS/RomFS, and the size is specified by the hash region fields. Interestingly, Nintendo's NCCH validation code seems to have the size of this region fixed to 0x200 bytes (for ExeFS at least).
All of the hashes stored in this NCCH header are over the cleartext data. The ExeFS/RomFS superblock starts at offset 0x0 in the ExeFS/RomFS, and the size is specified by the hash region fields. Interestingly, Nintendo's NCCH validation code seems to have the size of this region fixed to 0x200 bytes (for ExeFS at least).
As of [[5.0.0-11]] the application [[ExeFS]]:/.logo can be loaded from the plaintext region between the access descriptor and the plain region, all applications built since [[5.0.0-11]] store the logo here. The size of this logo is always 0x2000-bytes. Applications built starting with [[6.0.0-11]] have this logo data set to all-zero with the logo offset/size and hash(in the NCCH header) set the same as if there was actual logo data, it's unknown how this is handled.
As of [[5.0.0-11]] the application [[ExeFS]]:/.logo can be loaded from the plaintext region between the access descriptor and the plain region, all applications built since [[5.0.0-11]] store the logo here. The size of this logo is always 0x2000-bytes.
The plain region mainly contains tags for each SDK library used when building the CXI. The version used for the "FIRMWARE" tag is the kernel/FIRM [[Configuration_Memory|version]], this version can also be stored in the exheader "kernel release version" ARM11 kernel descriptor field. As of [[2.2.0-X]] the NATIVE_FIRM kernels check the CXI exheader "kernel release version" field, if it is stored in the CXI exheader. If the kernel/FIRM version specified by this field is higher than the version of the running NATIVE_FIRM, the kernel will return error-code 0xD9001413.
The plain region mainly contains tags for each SDK library used when building the CXI. The version used for the "FIRMWARE" tag is the kernel/FIRM [[Configuration_Memory|version]], this version can also be stored in the exheader "kernel release version" ARM11 kernel descriptor field. As of [[2.2.0-X]] the NATIVE_FIRM kernels check the CXI exheader "kernel release version" field, if it is stored in the CXI exheader. If the kernel/FIRM version specified by this field is higher than the version of the running NATIVE_FIRM, the kernel will return error-code 0xD9001413.