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/sh/include/asm/cache.h

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#ifndef __ASM_SH_CACHE_H
#define __ASM_SH_CACHE_H
#if defined(CONFIG_CPU_SH4)
int cache_control(unsigned int cmd);
#define L1_CACHE_BYTES 32
struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct *)(x))
#else
/*
* 32-bytes is the largest L1 data cache line size for SH the architecture. So
* it is a safe default for DMA alignment.
*/
#define ARCH_DMA_MINALIGN 32
#endif /* CONFIG_CPU_SH4 */
/*
* Use the L1 data cache line size value for the minimum DMA buffer alignment
* on SH.
*/
#ifndef ARCH_DMA_MINALIGN
#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
#endif
#endif /* __ASM_SH_CACHE_H */