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'''boot2''' is the [[Wii]]'s third-stage bootloader. It is responsible for loading the [[System Menu]] [[TMD]] and loading the appropriate [[IOS]] under normal circumstances, although it can also load [[MIOS]] if it detects the lowered clock speed set by [[BC]] (if [[IOS/Syscalls|syscall 55]] returns 162).
 
'''boot2''' is the [[Wii]]'s third-stage bootloader. It is responsible for loading the [[System Menu]] [[TMD]] and loading the appropriate [[IOS]] under normal circumstances, although it can also load [[MIOS]] if it detects the lowered clock speed set by [[BC]] (if [[IOS/Syscalls|syscall 55]] returns 162).
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boot2 itself is not much of a bootloader, and more of an IOS configured slightly differently with get_kernel_flavor returning 0 instead of 3. The main boot code is found in [[ES/Internal documentation|ES]], but this code is present in other IOS branches as well.
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boot2 itself is not much of a bootloader, and more of an IOS configured slightly differently with get_kernel_flavor returning 0 instead of 3. The main boot code is found in [[ES]], but this code is present in other IOS branches as well.
    
boot2 is also launched by MIOS when the power button is pressed; the System Menu is initialized in this case, and [[Memory Map|0x80003164]] <!-- read as c0003164 by the system menu; written as 00003164 by boot2 --> is set to 1 if the SRSTB_CPU bit is set in [[Hardware/Hollywood_Registers#HW_RESETS|HW_RESETS]]; the System Menu checks 0x80003164 and shuts down if it is enabled and [[:/title/00000001/00000002/data/state.dat|state.dat]] is set appropriately, with the message "Shutdown system from GC!".
 
boot2 is also launched by MIOS when the power button is pressed; the System Menu is initialized in this case, and [[Memory Map|0x80003164]] <!-- read as c0003164 by the system menu; written as 00003164 by boot2 --> is set to 1 if the SRSTB_CPU bit is set in [[Hardware/Hollywood_Registers#HW_RESETS|HW_RESETS]]; the System Menu checks 0x80003164 and shuts down if it is enabled and [[:/title/00000001/00000002/data/state.dat|state.dat]] is set appropriately, with the message "Shutdown system from GC!".
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