1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * (C) Copyright 2000-2010
4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 *
6 * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
7 * Andreas Heppel <aheppel@sysgo.de>
8 */
9
10#include <common.h>
11#include <command.h>
12#include <env.h>
13#include <env_internal.h>
14#include <asm/global_data.h>
15#include <linux/stddef.h>
16#include <search.h>
17#include <errno.h>
18#include <u-boot/crc.h>
19
20DECLARE_GLOBAL_DATA_PTR;
21
22static env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
23
24static int env_nvram_load(void)
25{
26	char buf[CONFIG_ENV_SIZE];
27
28	memcpy(buf, (void *)CONFIG_ENV_ADDR, CONFIG_ENV_SIZE);
29
30	return env_import(buf, 1, H_EXTERNAL);
31}
32
33static int env_nvram_save(void)
34{
35	env_t	env_new;
36	int	rcode = 0;
37
38	rcode = env_export(&env_new);
39	if (rcode)
40		return rcode;
41
42	if (memcpy((char *)CONFIG_ENV_ADDR, &env_new, CONFIG_ENV_SIZE) == NULL)
43		rcode = 1;
44
45	return rcode;
46}
47
48/*
49 * Initialize Environment use
50 *
51 * We are still running from ROM, so data use is limited
52 */
53static int env_nvram_init(void)
54{
55	if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
56		gd->env_addr = (ulong)&env_ptr->data;
57		gd->env_valid = ENV_VALID;
58	} else {
59		gd->env_valid = ENV_INVALID;
60	}
61
62	return 0;
63}
64
65U_BOOT_ENV_LOCATION(nvram) = {
66	.location	= ENVL_NVRAM,
67	ENV_NAME("NVRAM")
68	.load		= env_nvram_load,
69	.save		= env_save_ptr(env_nvram_save),
70	.init		= env_nvram_init,
71};
72