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SCFW: Custom Firmware & Kernel for Supercard
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<blockquote data-quote="davidgf" data-source="post: 10385460" data-attributes="member: 276513"><p>Thanks for your reply!</p><p>Yeah, diffing ROMs might be very helpful to find how they are patched and fix non-working games. I saw that some games have very specific patches (tho only a handful) and the majority are properly patched with the WAITCNT register write finder. But perhaps there's room to improve (I can imagine funny bugs since the patcher is so simple!)</p><p>So are there any features that need yet discovering, related to some more magic commands, any missing memory-mapped registers...? Asking cause I'm good with HW and could help somehow. For instance we could man-in-the-middle the ROM bus and see what reads/writes happen while using the original firmware. I did something similar, albeit much simpler, to reverse the wireless adapter.</p><p>Another funny option would be to emulate some of this on mgba/gpsp/vba to simplify the whole development process. AFAIU it would entail: adding writtable ROM (and RW switch), emulate the SD card interface and some of the mode switching bits...?</p></blockquote><p></p>
[QUOTE="davidgf, post: 10385460, member: 276513"] Thanks for your reply! Yeah, diffing ROMs might be very helpful to find how they are patched and fix non-working games. I saw that some games have very specific patches (tho only a handful) and the majority are properly patched with the WAITCNT register write finder. But perhaps there's room to improve (I can imagine funny bugs since the patcher is so simple!) So are there any features that need yet discovering, related to some more magic commands, any missing memory-mapped registers...? Asking cause I'm good with HW and could help somehow. For instance we could man-in-the-middle the ROM bus and see what reads/writes happen while using the original firmware. I did something similar, albeit much simpler, to reverse the wireless adapter. Another funny option would be to emulate some of this on mgba/gpsp/vba to simplify the whole development process. AFAIU it would entail: adding writtable ROM (and RW switch), emulate the SD card interface and some of the mode switching bits...? [/QUOTE]
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