stv0991: Add basic stv0991 architecture support

stv0991 architecture support added. It contains the support for
following blocks
- Timer
- uart

Signed-off-by: Vikas Manocha <vikas.manocha@st.com>
[trini: Add arch/arm/cpu/armv7/Makefile hunk]
Signed-off-by: Tom Rini <trini@ti.com>

configs/stv0991_defconfig

+CONFIG_SYS_EXTRA_OPTIONS="stv0991"
+CONFIG_ARM=y
+CONFIG_TARGET_STV0991=y

include/configs/stv0991.h

+/*
+ * (C) Copyright 2014
+ * Vikas Manocha, STMicroelectronics, <vikas.manocha@st.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __CONFIG_STV0991_H
+#define __CONFIG_STV0991_H
+
+#define CONFIG_SYS_DCACHE_OFF
+#define CONFIG_SYS_ICACHE_OFF
+#define CONFIG_SYS_EXCEPTION_VECTORS_HIGH
+#define CONFIG_BOARD_EARLY_INIT_F
+#define CONFIG_SYS_CORTEX_R4
+
+#define CONFIG_SYS_GENERIC_BOARD
+#define CONFIG_SYS_NO_FLASH
+
+/* ram memory-related information */
+#define CONFIG_NR_DRAM_BANKS			1
+#define PHYS_SDRAM_1				0x00000000
+#define CONFIG_SYS_SDRAM_BASE			PHYS_SDRAM_1
+#define PHYS_SDRAM_1_SIZE			0x00198000
+
+#define CONFIG_ENV_SIZE				0x10000
+#define CONFIG_ENV_IS_IN_FLASH
+#define CONFIG_ENV_ADDR				\
+	(PHYS_SDRAM_1_SIZE - CONFIG_ENV_SIZE)
+#define CONFIG_SYS_MAXARGS			16
+#define CONFIG_SYS_MALLOC_LEN			(CONFIG_ENV_SIZE + 16 * 1024)
+
+/* serial port (PL011) configuration */
+#define CONFIG_SYS_SERIAL0			0x80406000
+#define CONFIG_PL011_SERIAL
+#define CONFIG_CONS_INDEX			0
+#define CONFIG_BAUDRATE				115200
+#define CONFIG_PL01x_PORTS			{(void *)CONFIG_SYS_SERIAL0}
+#define CONFIG_PL011_CLOCK			(2700 * 1000)
+
+/* user interface */
+#define CONFIG_SYS_PROMPT			"STV0991> "
+#define CONFIG_SYS_CBSIZE			256/* Console I/O Buffer Size */
+#define CONFIG_SYS_PBSIZE			(CONFIG_SYS_CBSIZE \
+						+sizeof(CONFIG_SYS_PROMPT) + 16)
+
+/* MISC */
+#define CONFIG_SYS_LOAD_ADDR			0x00000000
+#define CONFIG_SYS_INIT_RAM_SIZE		0x2000
+#define CONFIG_SYS_INIT_RAM_ADDR		0x00190000
+#define CONFIG_SYS_INIT_SP_OFFSET		\
+	(CONFIG_SYS_INIT_RAM_SIZE - GENERATED_GBL_DATA_SIZE)
+/* U-boot Load Address */
+#define CONFIG_SYS_TEXT_BASE			0x00010000
+#define CONFIG_SYS_INIT_SP_ADDR			\
+	(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET)
+
+#endif /* __CONFIG_H */