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/cpu/ioapic.c

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/*
* Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/ioapic.h>
u32 io_apic_read(u32 reg)
{
writel(reg, IO_APIC_INDEX);
return readl(IO_APIC_DATA);
}
void io_apic_write(u32 reg, u32 val)
{
writel(reg, IO_APIC_INDEX);
writel(val, IO_APIC_DATA);
}