Boot process
The WiiU has two processors -- an ARM core (inside the Latte, known as "Starbuck") and a PowerPC core (Espresso). The boot process starts on the ARM core, which eventually bootstraps the PPC.
The code components involved in the WiiU's boot process are, in order:
- (ARM) boot0 A mask ROM which loads boot1 and verifies its SHA1 hash against that stored in OTP.
- (ARM) boot1 Lives in the first block of NAND and loads the IOSU from the NAND filesystem.
- (ARM) IOSU The IOSU is the operating system running on the ARM core. It bootstraps the PPC to start the Cafe OS.
- (PPC) Cafe OS The Cafe OS is the operating system running on the PowerPC core.
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