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/arm/cpu/armv8/tlb.S

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/*
* (C) Copyright 2013
* David Feng <fenghua@phytium.com.cn>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <asm-offsets.h>
#include <config.h>
#include <linux/linkage.h>
#include <asm/macro.h>
/*
* void __asm_invalidate_tlb_all(void)
*
* invalidate all tlb entries.
*/
.pushsection .text.__asm_invalidate_tlb_all, "ax"
ENTRY(__asm_invalidate_tlb_all)
switch_el x9, 3f, 2f, 1f
3: tlbi alle3
dsb sy
isb
b 0f
2: tlbi alle2
dsb sy
isb
b 0f
1: tlbi vmalle1
dsb sy
isb
0:
ret
ENDPROC(__asm_invalidate_tlb_all)
.popsection