Hacking Develop own kernel?

[UnsungDev]

Hello folks! I'm a software developer so I got some experience in programming.
I bought my little brother a R4i SDHC flashcard but I'm not satisfied with the kernel R4i SDHC offers so I want to write my own.

I only found entires/tutorials/code for developing "homebrew" and afaik (I don't have any Nintendo programming experience) this isn't the term I'm looking for.

The R4 kernel got a "R4.dat" file in the root folder - I guess thats the bootloader/entry point for the kernel (Please correct me if I'm wrong).

I'd be thankful for any resources/links/help you can provide me!

Greetings, UnsungDev.

 

[Technicmaster0]

I assume that you have a current R4 card from r4isdhc.com/r4i-sdhc.com.
I think that no one has sucessfully broken the format of their latest menu. You probably have to reverse the kernel.

 

[UnsungDev]

Is there any tool to analyze the R4.dat file? I tried IDA Pro, but it seems that it's not a normal arm9/11 file (maybe encrypted?)

 

[Technicmaster0]

There are programs to decrypt DS roms but you would have to figure out a way to decrypt it (if it's encrypted) on your own.

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BTW: there are some known keys to decrypt R4 kernels (read http://gbatemp.net/threads/analysis-on-the-gateway-3ds-blue-cart-updateable.357103/ for more information) and you can try to use them.