1 files changed, 20 insertions, 4 deletions

diff --git a/system/vl.c b/system/vl.c
index 9c6942c..2a570ed 100644
--- a/system/vl.c
+++ b/system/vl.c
@@ -53,6 +53,7 @@
 #include "hw/usb.h"
 #include "hw/isa/isa.h"
 #include "hw/scsi/scsi.h"
+#include "hw/sd/sd.h"
 #include "hw/display/vga.h"
 #include "hw/firmware/smbios.h"
 #include "hw/acpi/acpi.h"
@@ -194,7 +195,7 @@ static int default_parallel = 1;
 static int default_monitor = 1;
 static int default_floppy = 1;
 static int default_cdrom = 1;
-static int default_sdcard = 1;
+static bool auto_create_sdcard = true;
 static int default_vga = 1;
 static int default_net = 1;
 
@@ -718,7 +719,7 @@ static void configure_blockdev(BlockdevOptionsQueue *bdo_queue,
     default_drive(default_cdrom, snapshot, machine_class->block_default_type, 2,
                   CDROM_OPTS);
     default_drive(default_floppy, snapshot, IF_FLOPPY, 0, FD_OPTS);
-    default_drive(default_sdcard, snapshot, IF_SD, 0, SD_OPTS);
+    default_drive(auto_create_sdcard, snapshot, IF_SD, 0, SD_OPTS);
 
 }
 
@@ -1346,8 +1347,8 @@ static void qemu_disable_default_devices(void)
     if (!has_defaults || machine_class->no_cdrom) {
         default_cdrom = 0;
     }
-    if (!has_defaults || machine_class->no_sdcard) {
-        default_sdcard = 0;
+    if (!has_defaults || !machine_class->auto_create_sdcard) {
+        auto_create_sdcard = false;
     }
     if (!has_defaults) {
         default_audio = 0;
@@ -2661,12 +2662,27 @@ static void qemu_init_displays(void)
 
 static void qemu_init_board(void)
 {
+    MachineClass *machine_class = MACHINE_GET_CLASS(current_machine);
+
     /* process plugin before CPUs are created, but once -smp has been parsed */
     qemu_plugin_load_list(&plugin_list, &error_fatal);
 
     /* From here on we enter MACHINE_PHASE_INITIALIZED.  */
     machine_run_board_init(current_machine, mem_path, &error_fatal);
 
+    if (machine_class->auto_create_sdcard) {
+        bool ambigous;
+
+        /* Ensure there is a SD bus available to create SD card on */
+        Object *obj = object_resolve_path_type("", TYPE_SD_BUS, &ambigous);
+        if (!obj && !ambigous) {
+            fprintf(stderr, "Can not create sd-card on '%s' machine"
+                            " because it lacks a sd-bus\n",
+                            machine_class->name);
+            abort();
+        }
+    }
+
     drive_check_orphaned();
 
     realtime_init();