This should help people reversing iBoot and friends. It is a work in progress.
VIC (Vectored Interrupt Controller)
|Base (vic0): 0x38E00000
Base (vic1): 0x38E01000
||Raw Interrupt Status
||Interrupt Select (0=IRQ, 1=FIQ)
||Interrupt Enable (0=Disabled, 1=Enabled)
||Interrupt Enable Clear (Write-Only; 0=No Effect, 1=Interrupt enabled with previous reg disabled)
||Software Interrupt (0=Disabled, 1=Enabled)
||Software Interrupt Clear (Write-Only; 0=No Effect, 1=Interrupt enabled with previous reg disabled)
||Register Protection Mode. If bit 0 is set to 1, then Protection Mode is on and only privileged mode writes will work.
||Software Interrupt Priority Mask (0=Masked, 1=Not Masked)
||Vector Priority Levels
|0xFE0 through 0xFEC
||Not sure what these four registers are, because I can confirm that at least SecureROM, probably iBoot and such too, will simply read them when initializing the vectored interrupt controller. It does nothing about the contents...I'll post a snippet from IDA in the discussion page, but if anyone knows what these do, put it here.