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[Qemu-devel] [PATCH v4 12/12] fdc: change auto fallback drive for ISA FD

From: John Snow
Subject: [Qemu-devel] [PATCH v4 12/12] fdc: change auto fallback drive for ISA FDC to 288
Date: Wed, 20 Jan 2016 01:51:34 -0500

The 2.88 drive is more suitable as a default because
it can still read 1.44 images correctly, but the reverse
is not true.

Since there exist virtio-win drivers that are shipped on
2.88 floppy images, this patch will allow VMs booted without
a floppy disk inserted to later insert a 2.88MB floppy and
have that work.

This patch has been tested with msdos, freedos, fedora,
windows 8 and windows 10 without issue: if problems do
arise for certain guests being unable to cope with 2.88MB
drives as the default, they are in the minority and can use
type=144 as needed (or insert a proper boot medium and omit
type=144/288 or use type=auto) to obtain different drive types.

As icing, the default will remain auto/144 for any pre-2.6
machine types, hopefully minimizing the impact of this change
in legacy hw to basically zero.

Signed-off-by: John Snow <address@hidden>
 hw/block/fdc.c      | 2 +-
 include/hw/compat.h | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/hw/block/fdc.c b/hw/block/fdc.c
index f8f7e6d..fb0786d 100644
--- a/hw/block/fdc.c
+++ b/hw/block/fdc.c
@@ -2531,7 +2531,7 @@ static Property isa_fdc_properties[] = {
                         FLOPPY_DRIVE_TYPE_AUTO, qdev_prop_fdc_drive_type,
     DEFINE_PROP_DEFAULT("fallback", FDCtrlISABus, state.fallback,
-                        FLOPPY_DRIVE_TYPE_144, qdev_prop_fdc_drive_type,
+                        FLOPPY_DRIVE_TYPE_288, qdev_prop_fdc_drive_type,
diff --git a/include/hw/compat.h b/include/hw/compat.h
index 491884b..2ebe739 100644
--- a/include/hw/compat.h
+++ b/include/hw/compat.h
@@ -3,6 +3,10 @@
 #define HW_COMPAT_2_5 \
+        .driver   = "isa-fdc",\
+        .property = "fallback",\
+        .value    = "144",\
+    },{\
         .driver   = "pvscsi",\
         .property = "x-old-pci-configuration",\
         .value    = "on",\

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