fix repeating dma. the incremented source and dest address werent being written back into the internal dma control variables. this fixes nsmb parallaxing backgrounds. we still have a rather large BUG in that the updated dma registers can't be read back by the game software. wait until next version to retool the dma control logic.

desmume/ChangeLog

@@ -22,6 +22,7 @@
  - Add secure area decryption from ndstool [zeromus]
  - change backupmem autodetection to catch more cases of unusual usage patterns [zeromus]
  - Fixed Thumb LDMIA (fixes ingame Dead'n'Furious) [shash]
+ - Fix repeating DMA (fixes NSMB parallax BG) [zeromus]
  Graphics:
  - Added gfx3d module which emulates the whole GE as part of the core emu. [zeromus]
  - Moved the windows/cocoa OGLRender to the emu core and replace ogl_collector. 

desmume/src/MMU.cpp

@@ -876,6 +876,11 @@ void FASTCALL MMU_doDMA(u32 proc, u32 num)
 				dst += dstinc;
 				src += srcinc;
 			}
+
+		//write back the addresses
+		DMASrc[proc][num] = src;
+		if((u & 0x3)!=3) //but dont write back dst if we were supposed to reload
+			DMADst[proc][num] = dst;
 	}
 }