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Thread: Difference between boot2 and IOS backups

  1. #1
    Junior Member jayc89's Avatar
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    Difference between boot2 and IOS backups

    Can anyone tell if what, if any, is the difference between a NAND backup taken from BootMii installed as boot2 and a backup taken from BootMii installed as IOS.

    I understand boot2 is the safest of the two, but am trying to get my head around why.

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  2. #2
    Member siphilips's Avatar
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    As long as you have a backup there is not much difference apart from Boot2 installation of Bootmii is more robust than an IOS.

    Boot process
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    The Wii has two processors -- an ARM core (inside the Hollywood, known as "Starlet") and a PowerPC (Broadway). The boot process starts on the ARM, which eventually bootstraps the PPC.

    The code components involved in the Wii's boot process are, in order:

    * (ARM) boot0 A mask ROM (1.5K) which loads boot1 and verifies its SHA1 hash against that stored in OTP. If there is a mismatch, the system will halt.
    * (ARM) boot1 Lives in the first block of NAND; loads one of two copies of boot2 from blocks 1-7 of NAND and verifies it using RSA / SHA1.
    * (ARM) boot2 A stripped-down version of IOS. It reads the NAND filesystem to load the System Menu's IOS
    * (ARM) IOS sees its being booted thanks to the (lowmen?) writes of boot2 and bootstraps the PPC to start the System Menu title (1-2)
    Homebrew Channel 1.0.6 | Internet Channel | Sys Menu 4.1e | NeoGamma R8 b15 | Preloader .30 r3 | cIOS38 r14 | Wad Manager 1.5 | cIOSCORP 3.5 | DVDX v2 | Mplayer CE | WiiGator GC Backup Launcher Ver 2.0 | Wii64 Nintendo 64 Emulator | Homebrew Browser V 0.3.6 | IOSCheck V 0.3.6







  3. #3
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    because boot2 loads before the system menu does, so you can access it under the most difficult of circumstances.

  4. #4
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    yea what he said lol.

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