dumpstack even with no up
use uartrb (to use the portable uart code)
don't print when ether queues are full

Reference: /n/atom/patch/applied2013/rbnits
Date: Wed Aug  7 03:07:36 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/9/rb/trap.c	Wed Aug  7 03:06:55 2013
+++ /sys/src/9/rb/trap.c	Wed Aug  7 03:06:55 2013
@@ -585,9 +585,6 @@
 	ulong l, v, top, i;
 	extern ulong etext;
 
-	if(up == 0)
-		return;
-
 	print("ktrace /kernel/path %.8lux %.8lux %.8lux\n",
 		ureg->pc, ureg->sp, ureg->r31);
 	top = (ulong)up->kstack + KSTACK;
--- /sys/src/9/rb/rb	Wed Aug  7 03:06:55 2013
+++ /sys/src/9/rb/rb	Wed Aug  7 03:06:55 2013
@@ -30,7 +30,9 @@
 	qmalloc
 	noswap
 
-	uarti8250
+#	uarti8250
+	uartrb		uartp8250
+
 # emulated fp
 	fpi
 	fpimips
@@ -48,8 +50,9 @@
 
 port
 	int cpuserver = 1;
-	uchar arge0mac[] = { 0xd4, 0xca, 0x6d, 0x60, 0xb8, 0x42, };
-	uchar arge1mac[] = { 0xd4, 0xca, 0x6d, 0x60, 0xb8, 0x43, };
+	uchar arge0mac[] = { 0xd4, 0xca, 0x6d, 0x2f, 0x04, 0xbc, };
+	uchar arge1mac[] = { 0xd4, 0xca, 0x6d, 0x2f, 0x04, 0xbd, };
+	char bootmethod[] = "il";
 
 boot cpu
 	il
--- /sys/src/9/rb/devether.c	Wed Aug  7 03:06:55 2013
+++ /sys/src/9/rb/devether.c	Wed Aug  7 03:06:55 2013
@@ -1161,7 +1161,7 @@
 		i += sprint(buf+i, "%dGbps", ether->mbps/1000);
 	else
 		i += sprint(buf+i, "%dMbps", ether->mbps);
-	i += sprint(buf+i, " port %#luX irq %d", PADDR(ether->port), ether->irq);
+	i += sprint(buf+i, " port %#P irq %d", PADDR(ether->port), ether->irq);
 	i += sprint(buf+i, ": %2.2ux%2.2ux%2.2ux%2.2ux%2.2ux%2.2ux",
 		ether->ea[0], ether->ea[1], ether->ea[2],
 		ether->ea[3], ether->ea[4], ether->ea[5]);
@@ -1341,8 +1341,6 @@
 	}
 
 	if(!loopback){
-		if(qfull(ether->oq))
-			print("etheroq: WARNING: ether->oq full!\n");
 		qbwrite(ether->oq, bp);
 		athtransmit(ether);
 	} else