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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 SHA1 hash against that stored in [[Hardware/OTP|OTP]].
+* (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 the IOSU from the NAND filesystem.
+* (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]] - The IOSU is the operating system running on the ARM core. It bootstraps the PPC to start the Cafe OS.
+* (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.
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