sandbox: Add dummy SCSI functions

Add some functions needed by the SCSI code. This allows it to be compiled
for sandbox, thus increasing build coverage.

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/block/Makefile

@@ -22,7 +22,7 @@ obj-$(CONFIG_SATA_MV) += sata_mv.o
 obj-$(CONFIG_SATA_SIL3114) += sata_sil3114.o
 obj-$(CONFIG_SATA_SIL) += sata_sil.o
 obj-$(CONFIG_IDE_SIL680) += sil680.o
-obj-$(CONFIG_SANDBOX) += sandbox.o
+obj-$(CONFIG_SANDBOX) += sandbox.o sandbox_scsi.o
 obj-$(CONFIG_SCSI_SYM53C8XX) += sym53c8xx.o
 obj-$(CONFIG_SYSTEMACE) += systemace.o
 obj-$(CONFIG_BLOCK_CACHE) += blkcache.o

drivers/block/sandbox_scsi.c

@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ * This file contains dummy implementations of SCSI functions requried so
+ * that CONFIG_SCSI can be enabled for sandbox.
+ */
+
+#include <common.h>
+#include <scsi.h>
+
+void scsi_bus_reset(void)
+{
+}
+
+void scsi_init(void)
+{
+}
+
+int scsi_exec(ccb *pccb)
+{
+	return 0;
+}
+
+void scsi_print_error(ccb *pccb)
+{
+}