Never had the memory hack problem myself.
Someone here has fixed a Rockchip memory hack:-
[Tut] hwo to remove memory-hack on Rockchip Mp4-players.
but not sure which version it refers too.
btw have you had issues with do,while() and printf() with the rk26xx Sdk/Gdk?
I've been looking at porting again and had some problems with bugs in the SDK.