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/mips/include/asm/mach-generic/mangle-port.h

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/*
* Copyright (C) 2003, 2004 Ralf Baechle
*
* SPDX-License-Identifier: GPL-2.0
*/
#ifndef __ASM_MACH_GENERIC_MANGLE_PORT_H
#define __ASM_MACH_GENERIC_MANGLE_PORT_H
#define __swizzle_addr_b(port) (port)
#define __swizzle_addr_w(port) (port)
#define __swizzle_addr_l(port) (port)
#define __swizzle_addr_q(port) (port)
/*
* Sane hardware offers swapping of PCI/ISA I/O space accesses in hardware;
* less sane hardware forces software to fiddle with this...
*
* Regardless, if the host bus endianness mismatches that of PCI/ISA, then
* you can't have the numerical value of data and byte addresses within
* multibyte quantities both preserved at the same time. Hence two
* variations of functions: non-prefixed ones that preserve the value
* and prefixed ones that preserve byte addresses. The latters are
* typically used for moving raw data between a peripheral and memory (cf.
* string I/O functions), hence the "__mem_" prefix.
*/
#if defined(CONFIG_SWAP_IO_SPACE)
# define ioswabb(a, x) (x)
# define __mem_ioswabb(a, x) (x)
# define ioswabw(a, x) le16_to_cpu(x)
# define __mem_ioswabw(a, x) (x)
# define ioswabl(a, x) le32_to_cpu(x)
# define __mem_ioswabl(a, x) (x)
# define ioswabq(a, x) le64_to_cpu(x)
# define __mem_ioswabq(a, x) (x)
#else
# define ioswabb(a, x) (x)
# define __mem_ioswabb(a, x) (x)
# define ioswabw(a, x) (x)
# define __mem_ioswabw(a, x) cpu_to_le16(x)
# define ioswabl(a, x) (x)
# define __mem_ioswabl(a, x) cpu_to_le32(x)
# define ioswabq(a, x) (x)
# define __mem_ioswabq(a, x) cpu_to_le32(x)
#endif
#endif /* __ASM_MACH_GENERIC_MANGLE_PORT_H */