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Shutdown the card when a catastrophic error occurs. This quenches any interrupts stemming from the card. aic7xxx_inline.h: Return instead of processing additional interrupt state after handling a catastrophic error. We now shutdown the chip in this case in the hopes that the system can live without this controller. The shutdown process invalidates any other interrupt state. aic7xxx.seq: Only attempt to clear SCSIBUSL on Ultra2 controllers. The clearing is workaround for a selection timeout bug on U2/U160 controllers and happens to be illegal on aic7770 (EISA/VL) controllers.
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