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/arm926ejs/kirkwood/cache.c

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/*
* Copyright (c) 2012 Michael Walle
* Michael Walle <michael@walle.cc>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/arch/cpu.h>
#define FEROCEON_EXTRA_FEATURE_L2C_EN (1<<22)
void l2_cache_disable()
{
u32 ctrl;
ctrl = readfr_extra_feature_reg();
ctrl &= ~FEROCEON_EXTRA_FEATURE_L2C_EN;
writefr_extra_feature_reg(ctrl);
}