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sdiahci: only wait for drives that are in the process of becoming ready when onlining, add *noahci option

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

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

@@ -908,6 +908,7 @@

 	ilock(d);

 	switch(d->port->sstatus & Smask){

+	default:

 	case Smissing:

 		d->state = Dmissing;

 		break;

@@ -1497,7 +1498,7 @@

 	c = u->dev->ctlr;

 	d = c->drive[u->subno];

-	while(waitready(d) == 1)

+	while(d->state != Dmissing && waitready(d) == 1)

 		esleep(1);

 	dprint("%s: iaonline: %s\n", dnam(d), diskstates[d->state]);

@@ -2136,6 +2137,9 @@

 	if(done)

 		return nil;

 	done = 1;

+

+	if(getconf("*noahci") != nil)

+		return nil;

 	if(getconf("*ahcidebug") != nil){

 		debug = 1;

-- 

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