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Enable busmastering for SCH (Poulsbo) PATA controller.

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

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

@@ -2129,6 +2129,10 @@

 				map |= 2;

 			irqack = ichirqack;

 			break;

+		case (0x811a<<16)|0x8086:	/* Intel SCH (Poulsbo) */

+			map = 1;

+			irqack = ichirqack;

+			break;

 		}

 		for(channel = 0; channel < 2; channel++){

 			if((map & 1<<channel) == 0)

@@ -2255,7 +2259,8 @@

 		atadmaclr(ctlr);

 		if(ctlr->pcidev != nil)

 			pcisetbme(ctlr->pcidev);

-		ctlr->prdt = mallocalign(Nprd*sizeof(Prd), 4, 0, 64*1024);

+		/* Intel SCH requires 8 byte alignment, though datasheet says 4 m( */

+		ctlr->prdt = mallocalign(Nprd*sizeof(Prd), 8, 0, 64*1024);

 	}

 	snprint(name, sizeof(name), "%s (%s)", sdev->name, sdev->ifc->name);

 	intrenable(ctlr->irq, atainterrupt, ctlr, ctlr->tbdf, name);

-- 

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