Homebrew libctru and new 3DS RAM

sparius · Dec 8, 2022

Hello,

I'm currently trying to port a game to the 3DS which needs quite a lot of RAM.
I noticed that overwriting __ctru_heap_size/__ctru_linear_heap_size and __stacksize__ only gives me access to ~128MB RAM (counting in code/data and the 4MB reserved for kernel).
I'm running my code in Citra in New 3DS mode. So 256MB should be available right?
Is there a way to access the additional memory provided by the n3ds?

Thank you

zoogie · Dec 8, 2022

sparius said:
Hello,

I'm currently trying to port a game to the 3DS which needs quite a lot of RAM.
I noticed that overwriting __ctru_heap_size/__ctru_linear_heap_size and __stacksize__ only gives me access to ~128MB RAM (counting in code/data and the 4MB reserved for kernel).
I'm running my code in Citra in New 3DS mode. So 256MB should be available right?
Is there a way to access the additional memory provided by the n3ds?

Thank you

About half of that memory is usually reserved for OS modules and applets on real hardware. There is an ext mode for new3ds that will free up some of that lost space, and it can be accessed in the .rsf file for .cia builds
<https://github.com/LiquidFenrir/Lum...41d555d2d02ceea4d8ee40/cia_workaround.rsf#L67> (178MB)
Not sure how to access that mode for .3dsx format homebrew. Citra is pretty lenient with out of bounds memory access, and I'm not sure how much it will allow you use until it crashes. It won't be the same as real hardware though.

sparius · Dec 8, 2022

zoogie said:
About half of that memory is usually reserved for OS modules and applets on real hardware. There is an ext mode for new3ds that will free up some of that lost space, and it can be accessed in the .rsf file for .cia builds
(178MB)
Not sure how to access that mode for .3dsx format homebrew. Citra is pretty lenient with out of bounds memory access, and I'm not sure how much it will allow you use until it crashes. It won't be the same as real hardware though.

Thank you very much. The numbers making a lot more sense now. And thank you for the link.
I noticed some out of bounds errors in the citra log, thought this is normal. Have to test it on real hardware sometime.

Homebrew libctru and new 3DS RAM

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