ROM Hack [Q] Decompiling in IDA

[Huuf]

I just started on 3DS disassembling and such, I tried looking for the ROM / RAM segments locations but I can't find the information I need

There are two ARM's inside, ARM9 and ARM11, how is the code.bin file separated in them?

I have read that the 3DS is running bare metal, not on an OS, is this correct, and does the game never call any feature from the Firmware? E.g. all keys needed are stored on the cartridge, and if you could somehow boot the 3ds file on the machine, it would not require the firmware at all.

Both the ARM9 and ARM11 are Little Endian?

What are the RAM and ROM Sizes and offsets?

 

[Mrrraou]

There is an OS.
http://4dsdev.org/thread.php?id=100
Both are Little Endian (I think it's a CPU thing)
RAM and ROM sizes and offsets are located inside the NCCH extended header (also called exheader)

 

[Huuf]

Thanks the terms NCCH and exheader are useful for googling.

 

[Mrrraou]

Thanks the terms NCCH and exheader are useful for googling.

You should look on 3dbrew too. There is almost everything you need here.

 

[zoogie]

Thanks the terms NCCH and exheader are useful for googling.

You seriously need to consult 3dbrew.org. (im sure that's where your googling is bringing you anyway)

just to get you started:
http://www.3dbrew.org/wiki/Bootloader
http://3dbrew.org/wiki/Flash_Filesystem
http://3dbrew.org/wiki/FIRM
http://3dbrew.org/wiki/Home_Menu

http://3dbrew.org/wiki/Memory_layout
http://3dbrew.org/wiki/NCSD
http://3dbrew.org/wiki/NCCH

 

[Huuf]

Thanks, I got it loaded into IDA, I now only need to see how to get the system modules (newer version, which aren't on my 3ds), but this has been posted to a different thread, thanks again!