Srsa 4c/DIGIC notes
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The following are notes, mostly based on http://magiclantern.wikia.com/wiki/Register_Map
A420, Digic II
0xc04100xx: watchdog-related
0xc0400008: clock control, some functions that use this: EnableClk, DisableClk
needs to be set with disabled interrupts :)
0xc0a100xx: dma channel 1, used as "BltDmac", bitmap overlay-related
look around 0xffc7b6a8
the other dma channels seem to unused
