Difference between revisions of "Boot Process"

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(Created page with "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 event...")
 
 
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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:
* (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]].
* (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.
* (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.
* (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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Latest revision as of 21:32, 14 January 2020

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.