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/nios2/include/asm/cache.h

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/*
* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
* Scott McNutt <smcnutt@psyent.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __ASM_NIOS2_CACHE_H_
#define __ASM_NIOS2_CACHE_H_
extern void flush_dcache (unsigned long start, unsigned long size);
extern void flush_icache (unsigned long start, unsigned long size);
/*
* Valid L1 data cache line sizes for the NIOS2 architecture are 4, 16, and 32
* bytes. If the board configuration has not specified one we default to the
* largest of these values for alignment of DMA buffers.
*/
#ifdef CONFIG_SYS_CACHELINE_SIZE
#define ARCH_DMA_MINALIGN CONFIG_SYS_CACHELINE_SIZE
#else
#define ARCH_DMA_MINALIGN 32
#endif
#endif /* __ASM_NIOS2_CACHE_H_ */