Changes

Every Wii is preloaded at the hardware level with a few pieces of software; these are already present on the Wii and will run when the Wii is powered on at the factory. The first of these pieces of software is [[boot0]], the first piece of code ran on the Wii after power-on (which will stay the same from when it is physically programmed onto the chip to after factory setup, since it cannot physically be modified), which will check the stored [[boot1]] hash in the Wii's [[EFuse|eFuses]], and seeing that it is blank (as it is written to later in the process, using up its one opportunity to program it), determines that it is in the factory and continues with boot by loading boot1 from the NAND. boot1 works as usual by verifying the signature of the boot2 on the NAND, then loading it.

Every Wii is preloaded at the hardware level with a few pieces of software; these are already present on the Wii and will run when the Wii is powered on at the factory. The first of these pieces of software is [[boot0]], the first piece of code ran on the Wii after power-on (which will stay the same from when it is physically programmed onto the chip to after factory setup, since it cannot physically be modified), which will check the stored [[boot1]] hash in the Wii's [[EFuse|eFuses]], and seeing that it is blank (as it is written to later in the process, using up its one opportunity to program it), determines that it is in the factory and continues with boot by loading boot1 from the NAND. boot1 works as usual by verifying the signature of the boot2 on the NAND, then loading it.

Next, [[boot2]] loads; the version of boot2 installed at the factory is "sd_boot", a special boot2 which does not read or write to NAND and instead boots from the SD card; a SD card (designated as SD#1) is prepared containing a number of [[BroadOn]]-format [[WAD]] files (stored raw with no filesystem); one of these files has its contents executed as an ARM binary on the [[IOP]], said file being an installer program which will install the other WADs on the SD card to the NAND. On production systems, this typically includes a [[NDEV Menu]] and [[IOS]]4, although other variations have been seen such as images which install [[BC]] and [[MIOS]]. The NDEV Menu will then be booted, allowing for the next phase of setup to occur when a disc is inserted.

Next, [[boot2]] loads; the version of boot2 installed at the factory is "sd_boot", a special boot2 which does not read or write to NAND and instead boots from the SD card; a SD card (designated as SD#1) is prepared containing a number of [[BroadOn]]-format [[WAD]] files (stored raw with no filesystem); one of these files has its contents executed as an ARM binary on the [[IOP]], said file being an installer program which will install the other WADs on the SD card to the NAND. On production systems, this typically includes a [[NDEV Menu]] and [[IOS]]4, although other variations have been seen such as images which install [[BC]] and [[MIOS]]. The NDEV Menu will then be booted, performing some filesystem tests using the disc ID 0000. The menu then loads from the disc slot, allowing for the next phase of setup to occur when a disc is inserted.

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