msc add support

- SCSI_CMD_MODE_SELECT_6
- SCSI_CMD_MODE_SENSE_6
- SCSI_CMD_PREVENT_ALLOW_MEDIUM_REMOVAL

fix msc device bug with no data unsupported command
complete msc device demo with ram disk of 8KB

demos/bsp/boards/embedded_artists/oem_board/sdram.h

@@ -0,0 +1,31 @@
+/*****************************************************************************
+ *
+ *   Copyright(C) 2011, Embedded Artists AB
+ *   All rights reserved.
+ *
+ ******************************************************************************
+ * Software that is described herein is for illustrative purposes only
+ * which provides customers with programming information regarding the
+ * products. This software is supplied "AS IS" without any warranties.
+ * Embedded Artists AB assumes no responsibility or liability for the
+ * use of the software, conveys no license or title under any patent,
+ * copyright, or mask work right to the product. Embedded Artists AB
+ * reserves the right to make changes in the software without
+ * notification. Embedded Artists AB also make no representation or
+ * warranty that such application will be suitable for the specified
+ * use without further testing or modification.
+ *****************************************************************************/
+#ifndef __SDRAM_H
+#define __SDRAM_H
+
+#define SDRAM_SIZE               0x2000000  /* 256Mbit = 32MB */
+
+#define SDRAM_BASE               0x28000000 /*CS0*/
+
+extern uint32_t sdram_init(void);
+extern uint32_t sdram_test(void);
+
+#endif /* end __SDRAM_H */
+/****************************************************************************
+**                            End Of File
+*****************************************************************************/