Go back to using 0xf0000000 for PCI memory start.

Qemu/Kvm still has some dependencies on 0xe0000000, so go back until
they are ready.
diff --git a/src/config.h b/src/config.h
index dc0b69f..d83d6ea 100644
--- a/src/config.h
+++ b/src/config.h
@@ -145,6 +145,7 @@
 // 32KB for shadow ram copying (works around emulator deficiencies)
 #define BUILD_BIOS_TMP_ADDR       0x30000
 #define BUILD_MAX_HIGHMEM         0xe0000000
+#define BUILD_PCIMEM_START        0xf0000000
 
 #define BUILD_APIC_ADDR           0xfee00000
 #define BUILD_IOAPIC_ADDR         0xfec00000
diff --git a/src/pciinit.c b/src/pciinit.c
index a6070e7..0556ee2 100644
--- a/src/pciinit.c
+++ b/src/pciinit.c
@@ -194,7 +194,7 @@
     dprintf(3, "pci setup\n");
 
     pci_bios_io_addr = 0xc000;
-    pci_bios_mem_addr = BUILD_MAX_HIGHMEM;
+    pci_bios_mem_addr = BUILD_PCIMEM_START;
 
     int bdf, max;
     foreachpci(bdf, max) {