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/x86/include/asm/dma-mapping.h

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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* (C) Copyright 2007
* Stelian Pop <stelian@popies.net>
* Lead Tech Design <www.leadtechdesign.com>
*/
#ifndef __ASM_X86_DMA_MAPPING_H
#define __ASM_X86_DMA_MAPPING_H
#include <linux/dma-direction.h>
#define dma_mapping_error(x, y) 0
static inline void *dma_alloc_coherent(size_t len, unsigned long *handle)
{
*handle = (unsigned long)memalign(ARCH_DMA_MINALIGN, len);
return (void *)*handle;
}
static inline void dma_free_coherent(void *addr)
{
free(addr);
}
static inline unsigned long dma_map_single(volatile void *vaddr, size_t len,
enum dma_data_direction dir)
{
return (unsigned long)vaddr;
}
static inline void dma_unmap_single(volatile void *vaddr, size_t len,
unsigned long paddr)
{
}
#endif /* __ASM_X86_DMA_MAPPING_H */