The 'empty_slot' models a ChipEnable (or ChipSelect) MMIO device
pluggable on a bus.
The bus allow such slots to be not connected ('empty), thus no
bus errors are generated when this range is accessed.
The device is mapped at priority -10000 to allow other devices
to be mapped on top of it.
Signed-off-by: Philippe Mathieu-Daudé <f4...@amsat.org>
---
hw/misc/empty_slot.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/hw/misc/empty_slot.c b/hw/misc/empty_slot.c
index 0adf7a26dc..53299cdbd1 100644
--- a/hw/misc/empty_slot.c
+++ b/hw/misc/empty_slot.c
@@ -68,7 +68,11 @@ void empty_slot_init(hwaddr addr, uint64_t slot_size)
qdev_init_nofail(dev);
- sysbus_mmio_map(s, 0, addr);
+ /*
+ * We use a priority lower than the default UNIMPLEMENTED_DEVICE
+ * to be able to plug a UnimplementedDevice on an EmptySlot.
+ */
+ sysbus_mmio_map_overlap(s, 0, addr, -10000);
}
}
--
2.19.1
