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Nintendo 3DS
DS(i) Mode hacking progress thread
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<blockquote data-quote="ahezard" data-source="post: 6753275" data-attributes="member: 383573"><p>Ok, it is true that ARM7 and ARM9 can access main ram but the 16MB dsi ram mode maps the ram differently to the original 4MB ds mode which breaks retail ds games and most homebrews (the addresses used usually to access an uncached mirror of the ram in 4MB mode point to real ram and not a mirror of the ram in 16MB mode). The games can be patched to avoid that for sure and maybe it will be required in the end but for now we are limited to the 4MB ram mode if we want to run a retail ds game. </p><p>So I will not load the rom into ram, this would be faster and simpler if it was possible but it is not. I will patch the game to redirect the arm9 card commands towards arm7 that will read the necessary data into the .nds rom file onto sd. The arm7 card command will be patched as well but it is easier since the sd can be accessed directly. So there will not be a limit in the rom size for the compatible game.</p><p>If enabled the 16MB mode could be used for cache (12MB available), but cache management algorithms may be tricky to implement and are prone to create bugs, so this will not be present at launch.</p></blockquote><p></p>
[QUOTE="ahezard, post: 6753275, member: 383573"] Ok, it is true that ARM7 and ARM9 can access main ram but the 16MB dsi ram mode maps the ram differently to the original 4MB ds mode which breaks retail ds games and most homebrews (the addresses used usually to access an uncached mirror of the ram in 4MB mode point to real ram and not a mirror of the ram in 16MB mode). The games can be patched to avoid that for sure and maybe it will be required in the end but for now we are limited to the 4MB ram mode if we want to run a retail ds game. So I will not load the rom into ram, this would be faster and simpler if it was possible but it is not. I will patch the game to redirect the arm9 card commands towards arm7 that will read the necessary data into the .nds rom file onto sd. The arm7 card command will be patched as well but it is easier since the sd can be accessed directly. So there will not be a limit in the rom size for the compatible game. If enabled the 16MB mode could be used for cache (12MB available), but cache management algorithms may be tricky to implement and are prone to create bugs, so this will not be present at launch. [/QUOTE]
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