Changes

boot2 is built from the same code as a regular IOSes, but has a [[IOS/Syscalls|kernel flavor]] (syscall 47) of 0 instead of 3; boot2's ES module includes all of the [[:/dev/es|normal ES functionality]] but it goes unused due to this kernel flavor value.  Regular IOSes also have the same check for a flavor less than 3, but the bootmii path goes unused.

boot2 is built from the same code as a regular IOSes, but has a [[IOS/Syscalls|kernel flavor]] (syscall 47) of 0 instead of 3; boot2's ES module includes all of the [[:/dev/es|normal ES functionality]] but it goes unused due to this kernel flavor value.  Regular IOSes also have the same check for a flavor less than 3, but the bootmii path goes unused.

There are two copies of boot2 housed in [[Hardware/NAND|NAND]] blocks 1-7 in case of failure, loaded by [[boot1]]. Additionally, a copy of boot2 may exist as title 1-1 in the NAND filesystem.

There are two copies of boot2 housed in [[Hardware/NAND|NAND]] blocks 1-7 in case of failure, loaded by [[boot1]].

boot2 was updated in the [[System Menu 4.2|4.2 update]] to [[boot2v4]], the only time Nintendo has ever pushed a boot2 update. This was done by installing boot2 as title 1-1{{Check}}, then calling ES_ImportBoot to install it into the boot2 region of the NAND. Unfortunately, Nintendo did not test ES_ImportBoot very well, which led to many Wiis receiving a [[Brick#Low Level Brick (LLB)|low-level brick]], even if they were previously unmodded.

boot2 was updated in the [[4.2]] update to [[boot2v4]], the only time Nintendo has ever pushed a boot2 update. This was done by calling ES_ImportBoot to install it into the boot2 region of the NAND. Unfortunately, Nintendo did not test ES_ImportBoot very well, which led to many Wiis receiving a [[Brick#Low Level Brick (LLB)|low-level brick]], even if they were previously unmodded.

== Version history ==

== Version history ==