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Revision 1 CPU DMA crash: Difference between revisions
From SnesLab
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* Adjust the time at which GPDMA begins | * Adjust the time at which GPDMA begins | ||
* Decrease the number of bytes transferred during GPDMA | * Decrease the number of bytes transferred during GPDMA | ||
=== See Also === | |||
* [[Revision 1 PPU1 Time Over Bug]] | |||
=== References === | === References === | ||
Revision as of 05:36, 16 July 2023
Little is known about why the CPU revision 1 DMA crash happens. In 2015, Ramsis wrote a test rom to trigger it. [2]
Trigger
- kicking of an HDMA at about the same time that a General Purpose DMA finishes
Symptoms
Workarounds
- Use GPDMA only during vblank
- Make sure HDMA starts in the middle of a GPDMA data transfer
- Avoid HDMA
- Adjust the time at which GPDMA begins
- Decrease the number of bytes transferred during GPDMA
See Also
References
- page 2-25-1 of Book I of the official Super Nintendo development manual
- https://forums.nesdev.org/viewtopic.php?t=13280