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sdide: make sure bmiba is in i/o port space, not memory

--- a/sys/src/9/pc/sdide.c

+++ b/sys/src/9/pc/sdide.c

@@ -2160,7 +2160,7 @@

 			ctlr->maxdma = maxdma;

 			ctlr->span = span;

 			ctlr->irqack = irqack;

-			if(pi & 0x80)

+			if((pi & 0x80) && (p->mem[4].bar & 0x01))

 				ctlr->bmiba = (p->mem[4].bar & ~0x01) + channel*8;

 			if(head != nil)

 				tail->next = sdev;