[Qemu-block] [PATCH 4/6] hw: Default -drive to if=none instead of scsi when scsi cannot work

[Markus Armbruster]

Block backends defined with -drive if=scsi are meant to be picked up
by machine initialization code: a suitable frontend gets created and
wired up automatically.

if=scsi drives not picked up that way can still be used with -device
as if they had if=none, but that's unclean and best avoided.  Unused
ones produce an "Orphaned drive without device" warning.

A few machine types default to if=scsi, even though they don't
actually have a SCSI HBA.  This makes no sense.  Change their default
to if=none.  Affected machines:

* aarch64/arm: realview-pbx-a9 vexpress-a9 vexpress-a15 xilinx-zynq-a9

Cc: Peter Maydell <address@hidden>
Cc: "Edgar E. Iglesias" <address@hidden>
Cc: Alistair Francis <address@hidden>
Cc: address@hidden
Signed-off-by: Markus Armbruster <address@hidden>
---
 hw/arm/realview.c    | 1 -
 hw/arm/vexpress.c    | 1 -
 hw/arm/xilinx_zynq.c | 1 -
 3 files changed, 3 deletions(-)

diff --git a/hw/arm/realview.c b/hw/arm/realview.c
index 8eafcca..8c11c7a 100644
--- a/hw/arm/realview.c
+++ b/hw/arm/realview.c
@@ -443,7 +443,6 @@ static void realview_pbx_a9_class_init(ObjectClass *oc, 
void *data)
 
     mc->desc = "ARM RealView Platform Baseboard Explore for Cortex-A9";
     mc->init = realview_pbx_a9_init;
-    mc->block_default_type = IF_SCSI;
     mc->max_cpus = 4;
 }
 
diff --git a/hw/arm/vexpress.c b/hw/arm/vexpress.c
index 58760f4..5756470 100644
--- a/hw/arm/vexpress.c
+++ b/hw/arm/vexpress.c
@@ -751,7 +751,6 @@ static void vexpress_class_init(ObjectClass *oc, void *data)
 
     mc->desc = "ARM Versatile Express";
     mc->init = vexpress_common_init;
-    mc->block_default_type = IF_SCSI;
     mc->max_cpus = 4;
 }
 
diff --git a/hw/arm/xilinx_zynq.c b/hw/arm/xilinx_zynq.c
index 7dac20d..3985356 100644
--- a/hw/arm/xilinx_zynq.c
+++ b/hw/arm/xilinx_zynq.c
@@ -323,7 +323,6 @@ static void zynq_machine_init(MachineClass *mc)
 {
     mc->desc = "Xilinx Zynq Platform Baseboard for Cortex-A9";
     mc->init = zynq_init;
-    mc->block_default_type = IF_SCSI;
     mc->max_cpus = 1;
     mc->no_sdcard = 1;
 }
-- 
2.7.4