upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
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u-boot/include/configs/mx6_common.h

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
*/
#ifndef __MX6_COMMON_H
#define __MX6_COMMON_H
#if (defined(CONFIG_MX6UL) || defined(CONFIG_MX6ULL))
#define CONFIG_SC_TIMER_CLK 8000000 /* 8Mhz */
#define COUNTER_FREQUENCY CONFIG_SC_TIMER_CLK
#else
#ifndef CONFIG_SYS_L2CACHE_OFF
#define CONFIG_SYS_L2_PL310
#define CONFIG_SYS_PL310_BASE L2_PL310_BASE
#endif
#endif
#define CONFIG_BOARD_POSTCLK_INIT
#define CONFIG_MXC_GPT_HCLK
#define CONFIG_SYS_BOOTM_LEN 0x1000000
#include <linux/sizes.h>
#include <asm/arch/imx-regs.h>
#include <asm/mach-imx/gpio.h>
#ifndef CONFIG_MX6
#define CONFIG_MX6
#endif
#define CONFIG_SYS_FSL_CLK
/* ATAGs */
#define CONFIG_CMDLINE_TAG
#define CONFIG_SETUP_MEMORY_TAGS
#define CONFIG_INITRD_TAG
#define CONFIG_REVISION_TAG
/* Boot options */
#if defined(CONFIG_MX6SL) || defined(CONFIG_MX6SLL) || \
defined(CONFIG_MX6SX) || \
defined(CONFIG_MX6UL) || defined(CONFIG_MX6ULL)
#define CONFIG_LOADADDR 0x82000000
#else
#define CONFIG_LOADADDR 0x12000000
#endif
#define CONFIG_SYS_LOAD_ADDR CONFIG_LOADADDR
/* allow to overwrite serial and ethaddr */
#define CONFIG_ENV_OVERWRITE
/* Miscellaneous configurable options */
#define CONFIG_SYS_CBSIZE 512
#define CONFIG_SYS_MAXARGS 32
/* MMC */
#define CONFIG_BOUNCE_BUFFER
#define CONFIG_FSL_USDHC
/* Fuses */
#define CONFIG_MXC_OCOTP
/* Secure boot (HAB) support */
#ifdef CONFIG_SECURE_BOOT
#define CONFIG_CSF_SIZE 0x2000
#ifdef CONFIG_SPL_BUILD
#define CONFIG_SPL_DRIVERS_MISC_SUPPORT
#endif
#endif
#endif