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bcm: make sure fiq is on enabled on cpu0

--- a/sys/src/9/bcm/irq.c

+++ b/sys/src/9/bcm/irq.c

@@ -106,7 +106,7 @@

 	m->intr++;

 	v = vfiq;

-	if(v == nil)

+	if(v == nil || m->machno)

 		panic("cpu%d: unexpected item in bagging area", m->machno);

 	coherence();

 	v->f(ureg, v->a);

@@ -149,6 +149,7 @@

 	if(irq == IRQfiq){

 		assert((ip->FIQctl & Fiqenable) == 0);

 		assert((*enable & v->mask) == 0);

+		assert(cpu == 0);

 		vfiq = v;

 		ip->FIQctl = Fiqenable | irq;

 	}else{

-- 

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