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[PATCH v2 3/3] hw/hppa/machine: Map the PDC memory region with higher pr

From: Philippe Mathieu-Daudé
Subject: [PATCH v2 3/3] hw/hppa/machine: Map the PDC memory region with higher priority
Date: Thu, 9 Jan 2020 01:05:25 +0100

The region in range [0xf0000000 - 0xf1000000] is the PDC area
(Processor Dependent Code), where the firmware is loaded.
This region has higher priority than the main memory.

When the machine has more than 3840MB of RAM, there is an
overlap. Since the PDC is closer to the CPU in the bus
hierarchy, it gets accessed first, and the CPU does not have
access to the RAM in this range.

To model the same behavior and keep a simple memory layout,
reduce the priority of the RAM region. The PDC region ends
overlapping the RAM.

Signed-off-by: Philippe Mathieu-Daudé <address@hidden>
 hw/hppa/machine.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/hppa/machine.c b/hw/hppa/machine.c
index 119ae4d3c8..810e6718d9 100644
--- a/hw/hppa/machine.c
+++ b/hw/hppa/machine.c
@@ -98,7 +98,7 @@ static void machine_hppa_init(MachineState *machine)
     ram_region = g_new(MemoryRegion, 1);
     memory_region_allocate_system_memory(ram_region, OBJECT(machine),
                                          "ram", ram_size);
-    memory_region_add_subregion(addr_space, 0, ram_region);
+    memory_region_add_subregion_overlap(addr_space, 0, ram_region, -1);
     /* Init Dino (PCI host bus chip).  */
     pci_bus = dino_init(addr_space, &rtc_irq, &serial_irq);

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