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pc/pmmc: check pci membar type

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

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

@@ -231,7 +231,7 @@

 		}

 	}

-	if(p == nil || p->mem[0].size < 256)

+	if(p == nil || p->mem[0].size < 256 || (p->mem[0].bar & 1) != 0)

 		return -1;

 	pmmc->mmio = vmap(p->mem[0].bar & ~0x0F, p->mem[0].size);