diff --git a/hw/hppa/dino.c b/hw/hppa/dino.c
index 360716de5715..40f9e1a96312 100644
--- a/hw/hppa/dino.c
+++ b/hw/hppa/dino.c
@@ -178,7 +178,7 @@ static MemTxResult dino_chip_read_with_attrs(void *opaque, hwaddr addr,
     case DINO_PCI_IO_DATA ... DINO_PCI_IO_DATA + 3:
         /* Read from PCI IO space. */
         io = &address_space_io;
-        ioaddr = s->parent_obj.config_reg;
+        ioaddr = s->parent_obj.config_reg + (addr & 3);
         switch (size) {
         case 1:
             val = address_space_ldub(io, ioaddr, attrs, &ret);
@@ -250,7 +250,7 @@ static MemTxResult dino_chip_write_with_attrs(void *opaque, hwaddr addr,
     case DINO_IO_DATA ... DINO_PCI_IO_DATA + 3:
         /* Write into PCI IO space.  */
         io = &address_space_io;
-        ioaddr = s->parent_obj.config_reg;
+        ioaddr = s->parent_obj.config_reg + (addr & 3);
         switch (size) {
         case 1:
             address_space_stb(io, ioaddr, val, attrs, &ret);
@@ -360,6 +360,27 @@ static const MemoryRegionOps dino_config_data_ops = {
     .endianness = DEVICE_LITTLE_ENDIAN,
 };
 
+static uint64_t dino_config_addr_read(void *opaque, hwaddr addr, unsigned len)
+{
+    PCIHostState *s = opaque;
+    return s->config_reg;
+}
+
+static void dino_config_addr_write(void *opaque, hwaddr addr,
+                                   uint64_t val, unsigned len)
+{
+    PCIHostState *s = opaque;
+    s->config_reg = val & ~3U;
+}
+
+static const MemoryRegionOps dino_config_addr_ops = {
+    .read = dino_config_addr_read,
+    .write = dino_config_addr_write,
+    .valid.min_access_size = 4,
+    .valid.max_access_size = 4,
+    .endianness = DEVICE_BIG_ENDIAN,
+};
+
 static AddressSpace *dino_pcihost_set_iommu(PCIBus *bus, void *opaque,
                                             int devfn)
 {
@@ -440,7 +461,7 @@ PCIBus *dino_init(MemoryRegion *addr_space,
 
     /* Dino PCI config. */
     memory_region_init_io(&s->parent_obj.conf_mem, OBJECT(&s->parent_obj),
-                          &pci_host_conf_be_ops, dev, "pci-conf-idx", 4);
+                          &dino_config_addr_ops, dev, "pci-conf-idx", 4);
     memory_region_init_io(&s->parent_obj.data_mem, OBJECT(&s->parent_obj),
                           &dino_config_data_ops, dev, "pci-conf-data", 4);
     memory_region_add_subregion(&s->this_mem, DINO_PCI_CONFIG_ADDR,
diff --git a/pc-bios/hppa-firmware.img b/pc-bios/hppa-firmware.img
index 4ec0dbfc4ae0..86930974b9e1 100644
Binary files a/pc-bios/hppa-firmware.img and b/pc-bios/hppa-firmware.img differ