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/arc/include/asm/cache.h

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/*
* Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __ASM_ARC_CACHE_H
#define __ASM_ARC_CACHE_H
#include <config.h>
/*
* As of today we may handle any L1 cache line length right in software.
* For that essentially cache line length is a variable not constant.
* And to satisfy users of ARCH_DMA_MINALIGN we just use largest line length
* that may exist in either L1 or L2 (AKA SLC) caches on ARC.
*/
#define ARCH_DMA_MINALIGN 128
#if defined(ARC_MMU_ABSENT)
#define CONFIG_ARC_MMU_VER 0
#elif defined(CONFIG_ARC_MMU_V2)
#define CONFIG_ARC_MMU_VER 2
#elif defined(CONFIG_ARC_MMU_V3)
#define CONFIG_ARC_MMU_VER 3
#elif defined(CONFIG_ARC_MMU_V4)
#define CONFIG_ARC_MMU_VER 4
#endif
#ifndef __ASSEMBLY__
void cache_init(void);
#endif /* __ASSEMBLY__ */
#endif /* __ASM_ARC_CACHE_H */