diff --git a/sys/src/cmd/aux/vga/3dfx.c b/sys/src/cmd/aux/vga/3dfx.c
index d1a4b59f8..997849497 100644
--- a/sys/src/cmd/aux/vga/3dfx.c
+++ b/sys/src/cmd/aux/vga/3dfx.c
@@ -81,7 +81,8 @@ snarf(Vga* vga, Ctlr* ctlr)
 		vga->n[1] = 256;
 		vga->p[1] = 4;
 
-		if((v = (tdfx->pci->mem[2].bar & ~0x3)) == 0)
+		v = tdfx->pci->mem[2].bar & ~0x3;
+		if(v == 0)
 			error("%s: I/O not mapped\n", ctlr->name);
 		tdfx->io = v;
 
diff --git a/sys/src/cmd/aux/vga/i81x.c b/sys/src/cmd/aux/vga/i81x.c
index dc0001c0f..243512e2e 100644
--- a/sys/src/cmd/aux/vga/i81x.c
+++ b/sys/src/cmd/aux/vga/i81x.c
@@ -403,10 +403,10 @@ dump(Vga* vga, Ctlr* ctlr)
 
 	p = i81x->pci;
 	printitem(name, "mem[0]");
-	Bprint(&stdout, "base %lux size %d\n", p->mem[0].bar & ~0x0F, p->mem[0].size);
+	Bprint(&stdout, "base %llux size %d\n", p->mem[0].bar & ~0x0F, p->mem[0].size);
 
 	printitem(name, "mem[1]");
-	Bprint(&stdout, "base %lux size %d\n", p->mem[1].bar & ~0x0F, p->mem[1].size);
+	Bprint(&stdout, "base %llux size %d\n", p->mem[1].bar & ~0x0F, p->mem[1].size);
 
 }
 
diff --git a/sys/src/cmd/aux/vga/mach64xx.c b/sys/src/cmd/aux/vga/mach64xx.c
index b2c549eac..a0e56fc98 100644
--- a/sys/src/cmd/aux/vga/mach64xx.c
+++ b/sys/src/cmd/aux/vga/mach64xx.c
@@ -379,7 +379,8 @@ snarf(Vga* vga, Ctlr* ctlr)
 		mp->iow32 = portiow32;
 		mp->pci = pcimatch(0, 0x1002, 0);
 		if (mp->pci) {
-			if(v = mp->pci->mem[1].bar & ~0x3) {
+			v = mp->pci->mem[1].bar & ~0x3;
+			if(v != 0) {
 				mp->io = v;
 				mp->ior32 = pciior32;
 				mp->iow32 = pciiow32;
diff --git a/sys/src/cmd/aux/vga/main.c b/sys/src/cmd/aux/vga/main.c
index a3915d2ae..8d044c906 100644
--- a/sys/src/cmd/aux/vga/main.c
+++ b/sys/src/cmd/aux/vga/main.c
@@ -131,12 +131,12 @@ linear(Vga* vga)
 		 * new: addr p 0x12345678 v 0x82345678 size 0x123
 		 */
 		if(buf[0]=='p' && buf[1]==' '){
-			vga->vmb = strtoul(buf+2, 0, 0);
+			vga->vmb = strtoull(buf+2, 0, 0);
 			p = strstr(buf, "size");
 			if(p)
 				vga->apz = strtoul(p+4, 0, 0);
 		}else
-			vga->vmb = strtoul(buf, 0, 0);
+			vga->vmb = strtoull(buf, 0, 0);
 	}
 	else
 		vgactlw("linear", "0");
diff --git a/sys/src/cmd/aux/vga/pci.c b/sys/src/cmd/aux/vga/pci.c
index ad1227101..2b4c57e0c 100644
--- a/sys/src/cmd/aux/vga/pci.c
+++ b/sys/src/cmd/aux/vga/pci.c
@@ -70,9 +70,9 @@ pcicfginit(void)
 			j = strtol(s+1, &s, 10);
 			if(j < 0 || j >= nelem(p->mem))
 				break;
-			p->mem[j].bar = strtoul(s+1, &s, 16);
+			p->mem[j].bar = strtoull(s+1, &s, 16);
 			p->mem[j].size = strtoul(s+1, &s, 10);
-			trace("\tmem[%d] = %lux %d\n", j, p->mem[j].bar, p->mem[j].size);
+			trace("\tmem[%d] = %llux %d\n", j, p->mem[j].bar, p->mem[j].size);
 		}
 
 		if(pcilist != nil)
diff --git a/sys/src/cmd/aux/vga/pci.h b/sys/src/cmd/aux/vga/pci.h
index a245b0f96..f0f886aed 100644
--- a/sys/src/cmd/aux/vga/pci.h
+++ b/sys/src/cmd/aux/vga/pci.h
@@ -92,7 +92,7 @@ typedef struct Pcidev {
 	uchar	rid;			/* revision ID */
 
 	struct {
-		ulong	bar;		/* base address */
+		uvlong	bar;		/* base address */
 		int	size;
 	} mem[6];
 
diff --git a/sys/src/cmd/aux/vga/vga.c b/sys/src/cmd/aux/vga/vga.c
index 7269a07b3..c208b81a4 100644
--- a/sys/src/cmd/aux/vga/vga.c
+++ b/sys/src/cmd/aux/vga/vga.c
@@ -459,7 +459,7 @@ dump(Vga* vga, Ctlr* ctlr)
 
 	if(vga->vma || vga->vmb){
 		printitem(ctlr->name, "vm a b");
-		Bprint(&stdout, "%9lud %8lud\n", vga->vma, vga->vmb);
+		Bprint(&stdout, "%9lud %8llud\n", vga->vma, vga->vmb);
 	}
 	if(vga->vmz){
 		printitem(ctlr->name, "vmz");
diff --git a/sys/src/cmd/aux/vga/vga.h b/sys/src/cmd/aux/vga/vga.h
index 62955004b..daea27467 100644
--- a/sys/src/cmd/aux/vga/vga.h
+++ b/sys/src/cmd/aux/vga/vga.h
@@ -197,7 +197,7 @@ typedef struct Vga {
 	ulong	r[2];
 
 	ulong	vma;			/* video memory linear-address alignment */
-	ulong	vmb;			/* video memory linear-address base */
+	uvlong	vmb;			/* video memory linear-address base */
 	ulong	apz;			/* aperture size */
 	ulong	vmz;			/* video memory size */