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/arm/mach-k3/include/mach/am6_spl.h

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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
* Lokesh Vutla <lokeshvutla@ti.com>
*/
#ifndef _ASM_ARCH_AM6_SPL_H_
#define _ASM_ARCH_AM6_SPL_H_
#define BOOT_DEVICE_RAM 0x00
#define BOOT_DEVICE_OSPI 0x01
#define BOOT_DEVICE_QSPI 0x02
#define BOOT_DEVICE_HYPERFLASH 0x03
#define BOOT_DEVICE_SPI 0x04
#define BOOT_DEVICE_I2C 0x05
#define BOOT_DEVICE_MMC2 0x06
#define BOOT_DEVICE_ETHERNET 0x07
#define BOOT_DEVICE_USB 0x08
#define BOOT_DEVICE_PCIE 0x09
#define BOOT_DEVICE_UART 0x0a
#define BOOT_DEVICE_NAND 0x0c
#define BOOT_DEVICE_MMC1 0x0d
#define BOOT_DEVICE_MMC2_2 0x0e
#define BACKUP_BOOT_DEVICE_RAM 0x0
#define BACKUP_BOOT_DEVICE_USB 0x1
#define BACKUP_BOOT_DEVICE_UART 0x2
#define BACKUP_BOOT_DEVICE_ETHERNET 0x3
#define BACKUP_BOOT_DEVICE_MMC2 0x4
#define BACKUP_BOOT_DEVICE_SPI 0x5
#define BACKUP_BOOT_DEVICE_HYPERFLASH 0x6
#define BACKUP_BOOT_DEVICE_I2C 0x7
#define K3_PRIMARY_BOOTMODE 0x0
#define K3_BACKUP_BOOTMODE 0x1
#endif