mx6: Add board mx6memcal for use in validating DDR

This is a virtual "board" that uses configuration files and
Kconfig to define the memory layout used by a real board during
the board bring-up process.

It generates an SPL image that can be loaded using imx_usb or
SB_LOADER.exe.

When run, it will generate a set of calibration constants for
use in either or both a DCD configuration file for boards that
use u-boot.imx or struct mx6_mmdc_calibration for boards that
boot via SPL.

In essence, it is a configurable, open-source variant of the
Freescale ddr-stress tool.

	https://community.nxp.com/docs/DOC-105652

File mx6memcal_defconfig configures the board for use with
mx6sabresd or mx6qsabreauto.

Signed-off-by: Eric Nelson <eric@nelint.com>
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>

include/configs/mx6memcal.h

@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2010-2011 Freescale Semiconductor, Inc.
+ *
+ * Configuration settings for the Boundary Devices Nitrogen6X
+ * and Freescale i.MX6Q Sabre Lite boards.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __CONFIG_H
+#define __CONFIG_H
+
+/* SPL */
+
+#include "mx6_common.h"
+#include "imx6_spl.h"
+
+#undef CONFIG_FSL_ESDHC
+#undef CONFIG_MMC
+#undef CONFIG_SPL_MMC_SUPPORT
+#undef CONFIG_GENERIC_MMC
+#undef CONFIG_CMD_FUSE
+
+#define CONFIG_SYS_MEMTEST_START	0x10000000
+#define CONFIG_SYS_MEMTEST_END		0x20000000
+#define CONFIG_SYS_MALLOC_LEN		(64 * 1024 * 1024)
+
+#define CONFIG_MXC_UART
+#ifdef CONFIG_SERIAL_CONSOLE_UART1
+#if defined(CONFIG_MX6SL)
+#define CONFIG_MXC_UART_BASE		UART1_IPS_BASE_ADDR
+#else
+#define CONFIG_MXC_UART_BASE		UART1_BASE
+#endif
+#elif defined(CONFIG_SERIAL_CONSOLE_UART2)
+#define CONFIG_MXC_UART_BASE		UART2_BASE
+#else
+#error please define serial console (CONFIG_SERIAL_CONSOLE_UARTx)
+#endif
+#define CONFIG_BAUDRATE			115200
+
+#define CONFIG_SYS_PBSIZE (CONFIG_SYS_CBSIZE + 16)
+
+/* Physical Memory Map */
+#define CONFIG_NR_DRAM_BANKS	       1
+#define PHYS_SDRAM		       MMDC0_ARB_BASE_ADDR
+
+#define CONFIG_SYS_SDRAM_BASE	       PHYS_SDRAM
+#define CONFIG_SYS_INIT_RAM_ADDR       IRAM_BASE_ADDR
+#define CONFIG_SYS_INIT_RAM_SIZE       IRAM_SIZE
+
+#define CONFIG_SYS_INIT_SP_OFFSET \
+	(CONFIG_SYS_INIT_RAM_SIZE - GENERATED_GBL_DATA_SIZE)
+#define CONFIG_SYS_INIT_SP_ADDR \
+	(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET)
+
+#define CONFIG_ENV_SIZE			(8 * 1024)
+
+#endif	       /* __CONFIG_H */