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Hi i recently asked a question about disabling LV exposure simulation on 600D for external flash usage

( http://www.magiclantern.fm/forum/index.php?topic=3806.0 )

as far as i understand this feature is non-working / blocked on the 600D, but works on the 550D.

im trying to figure out what exactly causes this to happen in the firmware itself, i started by dumping the 600D firmware, and for now only defined the functions i found on stubs.S (using an .idc file i generated) obviously this is next to nothing compared to the 550D .idc floating around which has much more info to work with..

i would appreciate help in any of the following ways that could get me further into a solution :

* a 550D rom dump / a way to extract the 550D rom from the cannon update .fir ( didnt manage to find any working way yet.. )
* an .idc file for the 600D rom dump as 'complete' as the 550D one..
* hints/ i deas on how to locate what the firmware sets when the internal flash is on (what turns off the LV exposure simulation), where to look at
* an example of modifying (in-memory) the internal firmware code from within ML code

i know im kind of a 'noob' here.. but im hoping if i learn enough i could eventually give something back.. its a steep curve but we all start somewhere i guess

any help would be greatly appreciated ! 

The point of this is basically being able to shut down exposure simulation on the 600D.. and maybe even making flash work with 3rd party flashes (YN560) in LV mode.

is it possible to "trick" the camera into thinking a "cannon" flash is attached?.. or perhaps into thinking the internal flash is on ?