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pci: just in case the bios is drunk

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

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

@@ -441,10 +441,10 @@

 				if((hdt & 0x7F) != 0)

 					break;

 				rno = PciBAR0;

-				for(i = 0; i < nelem(p->mem); i++) {

+				for(i = 0; i <= 5; i++) {

 					p->mem[i].bar = pcicfgr32(p, rno);

 					p->mem[i].size = pcibarsize(p, rno);

-					if((p->mem[i].bar & 7) == 4){

+					if((p->mem[i].bar & 7) == 4 && i < 5){

 						ulong hi;

 						rno += 4;

-- 

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