Some changes on the PCSCSI code of the new year (January 1st, 2025) #5089
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1. Too many soft resets should not reset the SCSI layer, fixes CD Audio on the 53c90a MCA controller used by guests. 2. Implemented preliminary MDL S/G mode for the PCSCSI side. 3. The underflow DMA function is no longer needed as it now SCSI transfers on the 53c90a MCA controller works properly. 4. Minor corrections to the PCI side (mainly the revision). 5. The DMA 86c01 side of the MCA 53c90a controller is more polished now, should fix some more bugs.
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