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A2400 Notes
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Porting thread: http://chdk.setepontos.com/index.php?topic=9513.msg97387#msg97387

To enter CHDK <ALT> mode use the Playback [>] button.
Long Press of Playback button will execute original Canon functionality.

Playback [>] or Help [?] button can be configured as <ALT> mode button.


KNOWN BUGS
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- CHDK GUI sometimes flashes in shotting mode. 
  Reported here:  http://chdk.setepontos.com/index.php?topic=9513.msg99675#msg99675

Development notes:
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- This is a blind port.
- rand() and srand() are not part of original firmware. 
  They were added to platform/generic/wrappers.c under #ifdef CAM_MISSING_RAND
- Extended video time not implemented
- AF during video recording is not implemented
- hook_raw_image_addr() & hook_alt_raw_image_addr() return the same value
- Tables in shooting.c not verified.
- DNG calibration not done.
- LED addresses not found. This version is using address from A4000=A2300
- camera_set_led() was not tested.