switch support, Mainstone v2

Index: qemu_dev/hw/mainstone.c
===================================================================
@@ -87,33 +87,31 @@ static void mainstone_common_init(int ra
     /* Setup initial (reset) machine state */
     cpu->env->regs[15] = PXA2XX_SDRAM_BASE;
 
-    /* There are two 32MiB flash devices on the board */
+    /* There are two 32MiB flash devices on the board
+     * switch #7 governs which bank to use
+     */
     index = drive_get_index(IF_PFLASH, 0, 0);
     if (index == -1) {
-        fprintf(stderr, "Two flash images must be given with the "
+        fprintf(stderr, "One flash image must be given with the "
                 "'pflash' parameter\n");
         exit(1);
     }
-    if (!pflash_cfi01_register(MST_FLASH_0,
-                         mainstone_ram + PXA2XX_INTERNAL_SIZE,
-                         drives_table[index].bdrv,
-                         256 * 1024, 128, 4, 0, 0, 0, 0)) {
-        fprintf(stderr, "qemu: Error registering flash memory.\n");
-        exit(1);
-    }
-
-    index = drive_get_index(IF_PFLASH, 0, 1);
-    if (index == -1) {
-        fprintf(stderr, "Two flash images must be given with the "
-                "'pflash' parameter\n");
-        exit(1);
-    }
-    if (!pflash_cfi01_register(MST_FLASH_1,
-                         mainstone_ram + PXA2XX_INTERNAL_SIZE,
-                         drives_table[index].bdrv,
-                         256 * 1024, 128, 4, 0, 0, 0, 0)) {
-        fprintf(stderr, "qemu: Error registering flash memory.\n");
-        exit(1);
+    if(switch_get_value(CFG_SPDT_SWITCH, 7)) {
+        if (!pflash_cfi01_register(MST_FLASH_0,
+                        mainstone_ram + PXA2XX_INTERNAL_SIZE,
+                        drives_table[index].bdrv,
+                        256 * 1024, 128, 4, 0, 0, 0, 0)) {
+            fprintf(stderr, "qemu: Error registering flash memory.\n");
+            exit(1);
+        }
+    } else {
+        if (!pflash_cfi01_register(MST_FLASH_1,
+                        mainstone_ram + PXA2XX_INTERNAL_SIZE,
+                        drives_table[index].bdrv,
+                        256 * 1024, 128, 4, 0, 0, 0, 0)) {
+            fprintf(stderr, "qemu: Error registering flash memory.\n");
+            exit(1);
+        }
     }
 
     mst_irq = mst_irq_init(cpu, MST_FPGA_PHYS, PXA2XX_PIC_GPIO_0);