[Qemu-devel] [PATCH 3/3] sun4u: switch m48t59 NVRAM to MMIO access

[Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>]

Real sun4u systems memory-map the NVRAM on the (ISA) ebus, so switch over to
MMIO from ioport access whilst setting the base year to 1968 as used by Sun
systems. This allows all SPARC64 OSs included in my tests to correctly detect
the NVRAM IC and read the hardware clock correctly upon boot.

Note that this also requires a corresponding OpenBIOS update to switch the
SPARC64 NVRAM accessors over from ioport to MMIO.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
---
 hw/sparc64/sun4u.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/hw/sparc64/sun4u.c b/hw/sparc64/sun4u.c
index f607f00..e3314f3 100644
--- a/hw/sparc64/sun4u.c
+++ b/hw/sparc64/sun4u.c
@@ -612,7 +612,7 @@ pci_ebus_init1(PCIDevice *pci_dev)
                              0, 0x1000000);
     pci_register_bar(pci_dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->bar0);
     memory_region_init_alias(&s->bar1, OBJECT(s), "bar1", get_system_io(),
-                             0, 0x1000);
+                             0, 0x4000);
     pci_register_bar(pci_dev, 1, PCI_BASE_ADDRESS_SPACE_IO, &s->bar1);
     return 0;
 }
@@ -825,6 +825,7 @@ static void sun4uv_init(MemoryRegion *address_space_mem,
     uint64_t initrd_addr, initrd_size, kernel_addr, kernel_size, kernel_entry;
     PCIBus *pci_bus, *pci_bus2, *pci_bus3;
     ISABus *isa_bus;
+    SysBusDevice *s;
     qemu_irq *ivec_irqs, *pbm_irqs;
     DriveInfo *hd[MAX_IDE_BUS * MAX_IDE_DEVS];
     DriveInfo *fd[MAX_FD];
@@ -876,8 +877,13 @@ static void sun4uv_init(MemoryRegion *address_space_mem,
         fd[i] = drive_get(IF_FLOPPY, 0, i);
     }
     fdctrl_init_isa(isa_bus, fd);
-    nvram = m48t59_init_isa(isa_bus, 0x0074, NVRAM_SIZE, 2000, 59);
 
+    /* Map NVRAM into I/O (ebus) space */
+    nvram = m48t59_init(NULL, 0, 0, NVRAM_SIZE, 1968, 59);
+    s = SYS_BUS_DEVICE(nvram);
+    memory_region_add_subregion(get_system_io(), 0x2000,
+                                sysbus_mmio_get_region(s, 0));
+ 
     initrd_size = 0;
     initrd_addr = 0;
     kernel_size = sun4u_load_kernel(machine->kernel_filename,
-- 
1.7.10.4