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/drivers/misc/smsc_lpc47m.c

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/*
* Copyright (C) 2014, Bin Meng <bmeng.cn@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/pnp_def.h>
static void pnp_enter_conf_state(u16 dev)
{
u16 port = dev >> 8;
outb(0x55, port);
}
static void pnp_exit_conf_state(u16 dev)
{
u16 port = dev >> 8;
outb(0xaa, port);
}
void lpc47m_enable_serial(u16 dev, u16 iobase)
{
pnp_enter_conf_state(dev);
pnp_set_logical_device(dev);
pnp_set_enable(dev, 0);
pnp_set_iobase(dev, PNP_IDX_IO0, iobase);
pnp_set_enable(dev, 1);
pnp_exit_conf_state(dev);
}