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/arch/mips/mach-mt7620/mt76xx.h

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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) 2018 Stefan Roese <sr@denx.de>
*/
#ifndef __MT76XX_H
#define __MT76XX_H
#define MT76XX_SYSCTL_BASE 0x10000000
#define MT76XX_CHIPID_OFFS 0x00
#define MT76XX_CHIP_REV_ID_OFFS 0x0c
#define MT76XX_SYSCFG0_OFFS 0x10
#define MT76XX_MEMCTRL_BASE (MT76XX_SYSCTL_BASE + 0x0300)
#define MT76XX_RGCTRL_BASE (MT76XX_SYSCTL_BASE + 0x1000)
#define MT76XX_ROM_STATUS_REG (MT76XX_SYSCTL_BASE + 0x0028)
#define MT76XX_CLKCFG0_REG (MT76XX_SYSCTL_BASE + 0x002c)
#define MT76XX_DYN_CFG0_REG (MT76XX_SYSCTL_BASE + 0x0440)
#define DDR_CFG1_REG (MT76XX_MEMCTRL_BASE + 0x44)
#define DDR_CFG2_REG (MT76XX_MEMCTRL_BASE + 0x48)
#define DDR_CFG3_REG (MT76XX_MEMCTRL_BASE + 0x4c)
#define DDR_CFG4_REG (MT76XX_MEMCTRL_BASE + 0x50)
#ifndef __ASSEMBLY__
/* Prototypes */
void ddr_calibrate(void);
#endif
#endif