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sdiahci: do port reset on stuck drive on boot

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

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

@@ -912,6 +912,8 @@

 		d->state = Dmissing;

 		break;

 	case Spresent:

+		if(d->state == Dnull)

+			d->state = Dportreset;

 		break;

 	case Sphylink:

 		if(d->state == Dready)