cafe2wii
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cafe2wii is the process used to transition to WiiMode. It lowers the Espresso's clock speed, disables Starbuck access to Wii U-exclusive hardware, then launches the loaded IOS.
Launching cafe2wii
cafe2wii is launched by the MCP module of the IOSU.
MCP-CMPT will load multiple binaries from OSv0/v1 into MEM1.
It then launches the c2w.img, which prepares those binaries in memory.
There are 3 different launch modes for booting into vWii: "NORMAL", "SIMPLE_DOL" and "HAI". All launch modes load the OSv0/v1 c2w.img and foot.bin and read the Wii EEPROM using the "/dev/crpyto" ioctl 0x1e.
NORMAL (0)
This mode uses the c2w.img and font.bin from OSv0.
It reads and parses the TMD of the vWii System Menu stored in the SLCCMPT. Using the boot index of the TMD it loads the System Menu Ancast image into memory.
It also reads the TMD of the IOS specified by the System Menu and loads its boot content into memory.
SIMPLE_DOL (1)
HAI (2)
This mode uses the c2w.img and font.bin from OSv1.
It loads the COMPAT-BS Ancast image (boot.bin) from OSv1 into memory and an IOS named fw.img from the launched title.
It also prepares a structure with hai parameters in memory. Those parameters will be parsed by the loaded IOS.