--- /dev/null	2021-04-17 10:05:57.279410000 +0300
+++ board/friendlyarm/nanopi4/nanopi4.c	2021-04-17 10:04:22.580877000 +0300
@@ -0,0 +1,148 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2020 FriendlyElec Computer Tech. Co., Ltd.
+ * (http://www.friendlyarm.com)
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <env.h>
+#include <hash.h>
+#include <linux/bitops.h>
+#include <i2c.h>
+#include <init.h>
+#include <net.h>
+#include <netdev.h>
+#include <syscon.h>
+#include <asm/arch-rockchip/bootrom.h>
+#include <asm/arch-rockchip/clock.h>
+#include <asm/arch-rockchip/grf_rk3399.h>
+#include <asm/arch-rockchip/hardware.h>
+#include <asm/arch-rockchip/misc.h>
+#include <asm/io.h>
+#include <asm/setup.h>
+#include <u-boot/sha256.h>
+
+#ifdef CONFIG_MISC_INIT_R
+static void setup_iodomain(void)
+{
+	struct rk3399_grf_regs *grf =
+	    syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
+
+	/* BT565 and AUDIO is in 1.8v domain */
+	rk_setreg(&grf->io_vsel, BIT(0) | BIT(1));
+}
+
+static int __maybe_unused mac_read_from_generic_eeprom(u8 *addr)
+{
+	struct udevice *i2c_dev;
+	int ret;
+
+	/* Microchip 24AA02xxx EEPROMs with EUI-48 Node Identity */
+	ret = i2c_get_chip_for_busnum(2, 0x51, 1, &i2c_dev);
+	if (!ret)
+		ret = dm_i2c_read(i2c_dev, 0xfa, addr, 6);
+
+	return ret;
+}
+
+static void setup_macaddr(void)
+{
+#if CONFIG_IS_ENABLED(CMD_NET)
+	int ret;
+	const char *cpuid = env_get("cpuid#");
+	u8 hash[SHA256_SUM_LEN];
+	int size = sizeof(hash);
+	u8 mac_addr[6];
+	int from_eeprom = 0;
+	int lockdown = 0;
+
+#ifndef CONFIG_ENV_IS_NOWHERE
+	lockdown = env_get_yesno("lockdown") == 1;
+#endif
+	if (lockdown && env_get("ethaddr"))
+		return;
+
+	ret = mac_read_from_generic_eeprom(mac_addr);
+	if (!ret && is_valid_ethaddr(mac_addr)) {
+		eth_env_set_enetaddr("ethaddr", mac_addr);
+		from_eeprom = 1;
+	}
+
+	if (!cpuid) {
+		debug("%s: could not retrieve 'cpuid#'\n", __func__);
+		return;
+	}
+
+	ret = hash_block("sha256", (void *)cpuid, strlen(cpuid), hash, &size);
+	if (ret) {
+		debug("%s: failed to calculate SHA256\n", __func__);
+		return;
+	}
+
+	/* Copy 6 bytes of the hash to base the MAC address on */
+	memcpy(mac_addr, hash, 6);
+
+	/* Make this a valid MAC address and set it */
+	mac_addr[0] &= 0xfe;  /* clear multicast bit */
+	mac_addr[0] |= 0x02;  /* set local assignment bit (IEEE802) */
+
+	if (from_eeprom) {
+		eth_env_set_enetaddr("eth1addr", mac_addr);
+	} else {
+		eth_env_set_enetaddr("ethaddr", mac_addr);
+
+		if (lockdown && env_get("eth1addr"))
+			return;
+
+		/* Ugly, copy another 4 bytes to generate a similar address */
+		memcpy(mac_addr + 2, hash + 8, 4);
+		if (!memcmp(hash + 2, hash + 8, 4))
+			mac_addr[5] ^= 0xff;
+
+		eth_env_set_enetaddr("eth1addr", mac_addr);
+	}
+#endif
+
+	return;
+}
+
+int misc_init_r(void)
+{
+	const u32 cpuid_offset = 0x7;
+	const u32 cpuid_length = 0x10;
+	u8 cpuid[cpuid_length];
+	int ret;
+
+	setup_iodomain();
+
+	ret = rockchip_cpuid_from_efuse(cpuid_offset, cpuid_length, cpuid);
+	if (ret)
+		return ret;
+
+	ret = rockchip_cpuid_set(cpuid, cpuid_length);
+	if (ret)
+		return ret;
+
+	setup_macaddr();
+	bd_hwrev_init();
+
+	return 0;
+}
+#endif
+
+#ifdef CONFIG_SERIAL_TAG
+void get_board_serial(struct tag_serialnr *serialnr)
+{
+	char *serial_string;
+	u64 serial = 0;
+
+	serial_string = env_get("serial#");
+
+	if (serial_string)
+		serial = simple_strtoull(serial_string, NULL, 16);
+
+	serialnr->high = (u32)(serial >> 32);
+	serialnr->low = (u32)(serial & 0xffffffff);
+}
+#endif