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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.
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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:
The code components involved in the WiiU's boot process are, in order:
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* (ARM) [[boot0]] A mask ROM which loads boot1 and verifies its SHA1 hash against that stored in [[Hardware/OTP|OTP]].
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* (ARM) [[boot0]] - A mask ROM which loads boot1 and verifies its SHA1 hash against that stored in [[Hardware/OTP|OTP]].
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* (ARM) [[boot1]] Lives in the first block of NAND and loads the IOSU from the NAND filesystem.
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* (ARM) [[boot1]] - Lives in the first block of NAND and loads the IOSU from the NAND filesystem.
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* (ARM) [[IOSU]] The IOSU is the operating system running on the ARM core. It bootstraps the PPC to start the Cafe OS.
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* (ARM) [[IOSU]] - The IOSU is the operating system running on the ARM core. It bootstraps the PPC to start the Cafe OS.
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* (PPC) [[Cafe OS]] The Cafe OS is the operating system running on the PowerPC core.
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* (PPC) [[Cafe OS]] - The Cafe OS is the operating system running on the PowerPC core.
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