Difference between revisions of "Boot process"
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Hallowizer2 (talk | contribs) (Corrected information about boot0 and added the espresso boot rom) |
Hallowizer2 (talk | contribs) m (Hallowizer2 moved page Boot Process to Boot process: Sentence case) |
Latest revision as of 04:57, 10 August 2021
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 SHA-1 hash against that stored in its ancast header.
- (ARM) boot1 - Lives in the first block of NAND and loads IOSU from the NAND filesystem. It verifies IOSU as an ancast image, similar to boot0.
- (ARM) IOSU - IOSU is the operating system running on the ARM core. It loads Cafe OS into memory, then bootstraps the Espresso.
- (PPC) Espresso Boot ROM - The Espresso Boot ROM verifies the SHA-1 hash of Cafe OS against the hash stored in the ancast header.
- (PPC) Cafe OS - The Cafe OS is the operating system running on the PowerPC core.
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