Difference between revisions of "Boot process"
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Hallowizer2 (talk | contribs) (Corrected information about boot0 and added the espresso boot rom) |
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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 | + | * (ARM) [[boot0]] - A mask ROM which loads boot1 and verifies its SHA-1 hash against that stored in its [[Ancast Image|ancast header]]. |
| − | * (ARM) [[boot1]] - Lives in the first block of NAND and loads | + | * (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]] - | + | * (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. | * (PPC) [[Cafe OS]] - The Cafe OS is the operating system running on the PowerPC core. | ||
{{stub}} | {{stub}} | ||
Revision as of 03:03, 18 May 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.
| This article is a stub. You can help WiiUBrew by expanding it. |