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Hello Kitty Collection - Miracle Fashion Maker (Japan) black screen #1320

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benderscruffy opened this issue Feb 23, 2019 · 7 comments
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platform:GBA Game Boy Advance-related issues severity:boot failure Games that fail to show anything severity:holy grail Issues that affect all emulators
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@benderscruffy
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using 0.7.0
nothing but a black screen

@endrift
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endrift commented Feb 23, 2019

Old bug, never looked into it too deeply.

@endrift endrift added this to the mGBA 0.8.0 milestone Feb 23, 2019
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endrift commented Feb 24, 2019

Doesn't boot in any emulator. Does work on hardware though. This appears to have a similar root cause to #301 where it's reading a value from RAM and expecting it to be non-zero but it never sets it.

@endrift endrift added platform:GBA Game Boy Advance-related issues severity:boot failure Games that fail to show anything severity:holy grail Issues that affect all emulators labels Feb 24, 2019
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endrift commented Apr 29, 2019

Looks like the RAM address (0x0200002C) gets initialized (to 0x02000140) right after the function that dies gets called. Confirmed that it gets to 0x080427AA on hardware, so it's not initialized properly on hardware yet I don't think, but for some reason it managed to break out of the loop on invalid RAM it gets into (it looks like it's trying to crawl a linked list, but the linked list is all invalid memory).

@endrift endrift modified the milestones: mGBA 0.8.0, mGBA 0.9.0 Oct 5, 2019
@endrift endrift closed this as completed Jan 25, 2020
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endrift commented Jan 25, 2020

Fixed in 93633ea.

@michelhe
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Hey @endrift
I've read the blog post you made about this issue, thank you for the wonderful read! 👍
I myself toy with developing a GBA emulator in rust, and this game is booting successfully for me.
I suppose its due to that I'm not implementing the "open bus" behavior at all, I just return 0 for invalid memory region accesses, or mask out invalid address bits if the region is correct.
When I move on to implement open-bus, I will sure take into account the DMA lingering on the bus 😄

@endrift
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endrift commented Jan 27, 2020

If you're wondering why Minish Cap hangs when you leave the house at the beginning of the game, that's because you don't have open bus emulated

@michelhe
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Sadly I did not get to experience that because I don't emulate EEPROM saves , but I will get there soon enough.

@mgba-emu mgba-emu deleted a comment Dec 3, 2021
@mgba-emu mgba-emu deleted a comment Dec 3, 2021
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