Emulator

Just thought I'd add that I recently encountered a very similar error. Playing MarioKart Wii, Immediately after selecting "Automatic" or "Manual". Error Text reads:
BackPatch - no support for operand size 1
Error encountered accessing emulated address c2e46846.
Culprit instruction:
movzx eax, byte ptr ds:[rbx+rcx]
at 000000001161accb

This was encountered using x64 revision 6120, compiled myself, on Win 7 x64

1. Savestates are not stored in the memory card. They are in \User\StateSaves
2. Don't attach files here, the space Google Code projects get for attachments is limited. Upload to MediaFire or a similar off-site file hoster and link to it.
3. Be sure to specify the region of the game you're using. It's probably PAL since your memcard is EUR, but in the future…

Yes the game is in PAL.I thought memory card and explanation will suffice to reproduce the bug,but if wished for I can make a savesate and upload to RS or MU.Can anyone of the devs explain what this BackPatch operand size 1 means and how this error can occur in emulation?I'd be very interested,thanks

The bug with 8-bits backpatch (operand size 1) should be fixed in r6120.
Can you confirm?

Sorry, didn't see that it was happening in r6120... I'll have a look.

I feel like a fool, but now I can't even seem to recreate my own issue with Mario Kart. It did it three times in a row at the same spot, now I can't get it to do it again...

Bohlio: Which mode were you using (Jit or JitIL) when you had the bug in r6120?

I was using Jit when I encountered the problem.

Things have changed.In 6120 the BackPatch Error doesn't occur anymore in JIT,but instead the screen goes black music plays for a while (slowly fading out) until nothing happens in audio or video (black screen remains),but Dolphin still running at Speed 100%.(tested with x86/x64 Interpreter+JIT+JITIL)If someone would like to have a closer look on this,I uploaded a SaveState right before entering the doomed door which makes the screen go black. http://www.multiupload.com/1LIVTDS3QP

Are you saying that it should be fixed in JIT under 6120, or that the error itself cant be generated in the code in 6120. I'm 100% certain that I was using JIT and 6120 when I had the error on mariokart.

dok.slade, the error can still occur in r6120 if there is a JIT problem in the LoadStorePaired or lfs instructions. The address quoted "c2e46846" is not a valid gamecube address, so the problem is likely due to a bug in the JIT.

Bohlio, can you try it with JITIL?

skidau: the backpatch error at "c2e46846" is caused by a 8-bit access. But neither lfs nor any LoadStorePaired instructions are doing 8-bit accesses, if I remember.

@skidau & Dok - Sorry if I muddied up this ticket a little bit. The address "c2e46846" was posted by me with a Wii game, not GameCube, so keep that in mind. Also, I can't recreate my issue, under JIT or JITIL, so I apologize for that.

Issue 1176 has been merged into this issue.

I had this problem, too.
Open Dolphin and right-click on the game where that error message appears, then go to "properties".
You should see a box which says "core". there you have to check "enable mmu" and "speed up disc transfer rate"(these are needed for some games).
I'm not 100 % sure if this will solve your problem but it worked for me :)