5124d90b3b
TURBOChannel cfb has a vertical-retrace interupt that cannot be disabled in software. 4.4BSD and NetBSD don't supply an interrupt hander and simply neverenable interrupts from slots with a cfb. This has never ever worked with a cfb in a 3MIN (Decstation 5000/1xx), where a TURBOChannel card in slot 0 (or 1 or 2) interrupts at the same IPL as spl0() (or spl1 or spl2), and there's also never been support for selectively enabling or disabling those interrupts on a 3MIN, in either NetBSD or 4.4BSD. This revision add an interrupt handler for the cfb, used only on 3MINs, so that a 3MIN can boot with a cfb as console, and enable/disable of TC slot interrupts can be debugged. (Serial consoles via ioasic SCCs still don't quite work, and simply clearing the relevant bits in the R3000 cause register is apparently over-ridden by a subsequent spl0() somewhere else.) |
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