1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2000-2010
4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
7 * Stuart Wood, Lab X Technologies <stuart.wood@labxtechnologies.com>
10 * Jian Zhang, Texas Instruments, jzhang@ti.com.
12 * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
13 * Andreas Heppel <aheppel@sysgo.de>
19 #include <env_internal.h>
20 #include <linux/stddef.h>
27 #if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_NAND) && \
28 !defined(CONFIG_SPL_BUILD)
30 #elif defined(CONFIG_ENV_OFFSET_REDUND) && !defined(CONFIG_SPL_BUILD)
31 #error CONFIG_ENV_OFFSET_REDUND must have CONFIG_CMD_SAVEENV & CONFIG_CMD_NAND
34 #ifndef CONFIG_ENV_RANGE
35 #define CONFIG_ENV_RANGE CONFIG_ENV_SIZE
38 #if defined(ENV_IS_EMBEDDED)
39 static env_t *env_ptr = &environment;
40 #elif defined(CONFIG_NAND_ENV_DST)
41 static env_t *env_ptr = (env_t *)CONFIG_NAND_ENV_DST;
42 #endif /* ENV_IS_EMBEDDED */
44 DECLARE_GLOBAL_DATA_PTR;
47 * This is called before nand_init() so we can't read NAND to
50 * Mark it OK for now. env_relocate() in env_common.c will call our
51 * relocate function which does the real validation.
53 * When using a NAND boot image (like sequoia_nand), the environment
54 * can be embedded or attached to the U-Boot image in NAND flash.
55 * This way the SPL loads not only the U-Boot image from NAND but
56 * also the environment.
58 static int env_nand_init(void)
60 #if defined(ENV_IS_EMBEDDED) || defined(CONFIG_NAND_ENV_DST)
61 int crc1_ok = 0, crc2_ok = 0;
64 #ifdef CONFIG_ENV_OFFSET_REDUND
67 tmp_env2 = (env_t *)((ulong)env_ptr + CONFIG_ENV_SIZE);
68 crc2_ok = crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc;
71 crc1_ok = crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc;
73 if (!crc1_ok && !crc2_ok) {
75 gd->env_valid = ENV_INVALID;
78 } else if (crc1_ok && !crc2_ok) {
79 gd->env_valid = ENV_VALID;
81 #ifdef CONFIG_ENV_OFFSET_REDUND
82 else if (!crc1_ok && crc2_ok) {
83 gd->env_valid = ENV_REDUND;
85 /* both ok - check serial */
86 if (tmp_env1->flags == 255 && tmp_env2->flags == 0)
87 gd->env_valid = ENV_REDUND;
88 else if (tmp_env2->flags == 255 && tmp_env1->flags == 0)
89 gd->env_valid = ENV_VALID;
90 else if (tmp_env1->flags > tmp_env2->flags)
91 gd->env_valid = ENV_VALID;
92 else if (tmp_env2->flags > tmp_env1->flags)
93 gd->env_valid = ENV_REDUND;
94 else /* flags are equal - almost impossible */
95 gd->env_valid = ENV_VALID;
98 if (gd->env_valid == ENV_REDUND)
102 if (gd->env_valid == ENV_VALID)
105 gd->env_addr = (ulong)env_ptr->data;
107 #else /* ENV_IS_EMBEDDED || CONFIG_NAND_ENV_DST */
108 gd->env_addr = (ulong)&default_environment[0];
109 gd->env_valid = ENV_VALID;
110 #endif /* ENV_IS_EMBEDDED || CONFIG_NAND_ENV_DST */
117 * The legacy NAND code saved the environment in the first NAND device i.e.,
118 * nand_dev_desc + 0. This is also the behaviour using the new NAND code.
120 static int writeenv(size_t offset, u_char *buf)
122 size_t end = offset + CONFIG_ENV_RANGE;
123 size_t amount_saved = 0;
124 size_t blocksize, len;
125 struct mtd_info *mtd;
128 mtd = get_nand_dev_by_index(0);
132 blocksize = mtd->erasesize;
133 len = min(blocksize, (size_t)CONFIG_ENV_SIZE);
135 while (amount_saved < CONFIG_ENV_SIZE && offset < end) {
136 if (nand_block_isbad(mtd, offset)) {
139 char_ptr = &buf[amount_saved];
140 if (nand_write(mtd, offset, &len, char_ptr))
147 if (amount_saved != CONFIG_ENV_SIZE)
153 struct nand_env_location {
155 const nand_erase_options_t erase_opts;
158 static int erase_and_write_env(const struct nand_env_location *location,
161 struct mtd_info *mtd;
164 mtd = get_nand_dev_by_index(0);
168 printf("Erasing %s...\n", location->name);
169 if (nand_erase_opts(mtd, &location->erase_opts))
172 printf("Writing to %s... ", location->name);
173 ret = writeenv(location->erase_opts.offset, env_new);
174 puts(ret ? "FAILED!\n" : "OK\n");
179 static int env_nand_save(void)
182 ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
184 static const struct nand_env_location location[] = {
188 .length = CONFIG_ENV_RANGE,
189 .offset = CONFIG_ENV_OFFSET,
192 #ifdef CONFIG_ENV_OFFSET_REDUND
194 .name = "redundant NAND",
196 .length = CONFIG_ENV_RANGE,
197 .offset = CONFIG_ENV_OFFSET_REDUND,
204 if (CONFIG_ENV_RANGE < CONFIG_ENV_SIZE)
207 ret = env_export(env_new);
211 #ifdef CONFIG_ENV_OFFSET_REDUND
212 env_idx = (gd->env_valid == ENV_VALID);
215 ret = erase_and_write_env(&location[env_idx], (u_char *)env_new);
216 #ifdef CONFIG_ENV_OFFSET_REDUND
218 /* preset other copy for next write */
219 gd->env_valid = gd->env_valid == ENV_REDUND ? ENV_VALID :
224 env_idx = (env_idx + 1) & 1;
225 ret = erase_and_write_env(&location[env_idx], (u_char *)env_new);
227 printf("Warning: primary env write failed,"
228 " redundancy is lost!\n");
233 #endif /* CMD_SAVEENV */
235 #if defined(CONFIG_SPL_BUILD)
236 static int readenv(size_t offset, u_char *buf)
238 return nand_spl_load_image(offset, CONFIG_ENV_SIZE, buf);
241 static int readenv(size_t offset, u_char *buf)
243 size_t end = offset + CONFIG_ENV_RANGE;
244 size_t amount_loaded = 0;
245 size_t blocksize, len;
246 struct mtd_info *mtd;
249 mtd = get_nand_dev_by_index(0);
253 blocksize = mtd->erasesize;
254 len = min(blocksize, (size_t)CONFIG_ENV_SIZE);
256 while (amount_loaded < CONFIG_ENV_SIZE && offset < end) {
257 if (nand_block_isbad(mtd, offset)) {
260 char_ptr = &buf[amount_loaded];
261 if (nand_read_skip_bad(mtd, offset,
263 mtd->size, char_ptr))
267 amount_loaded += len;
271 if (amount_loaded != CONFIG_ENV_SIZE)
276 #endif /* #if defined(CONFIG_SPL_BUILD) */
278 #ifdef CONFIG_ENV_OFFSET_OOB
279 int get_nand_env_oob(struct mtd_info *mtd, unsigned long *result)
281 struct mtd_oob_ops ops;
282 uint32_t oob_buf[ENV_OFFSET_SIZE / sizeof(uint32_t)];
286 ops.mode = MTD_OOB_AUTO;
288 ops.ooblen = ENV_OFFSET_SIZE;
289 ops.oobbuf = (void *)oob_buf;
291 ret = mtd->read_oob(mtd, ENV_OFFSET_SIZE, &ops);
293 printf("error reading OOB block 0\n");
297 if (oob_buf[0] == ENV_OOB_MARKER) {
298 *result = ovoid ob_buf[1] * mtd->erasesize;
299 } else if (oob_buf[0] == ENV_OOB_MARKER_OLD) {
300 *result = oob_buf[1];
302 printf("No dynamic environment marker in OOB block 0\n");
310 #ifdef CONFIG_ENV_OFFSET_REDUND
311 static int env_nand_load(void)
313 #if defined(ENV_IS_EMBEDDED)
316 int read1_fail, read2_fail;
317 env_t *tmp_env1, *tmp_env2;
320 tmp_env1 = (env_t *)malloc(CONFIG_ENV_SIZE);
321 tmp_env2 = (env_t *)malloc(CONFIG_ENV_SIZE);
322 if (tmp_env1 == NULL || tmp_env2 == NULL) {
323 puts("Can't allocate buffers for environment\n");
324 env_set_default("malloc() failed", 0);
329 read1_fail = readenv(CONFIG_ENV_OFFSET, (u_char *) tmp_env1);
330 read2_fail = readenv(CONFIG_ENV_OFFSET_REDUND, (u_char *) tmp_env2);
332 ret = env_import_redund((char *)tmp_env1, read1_fail, (char *)tmp_env2,
340 #endif /* ! ENV_IS_EMBEDDED */
342 #else /* ! CONFIG_ENV_OFFSET_REDUND */
344 * The legacy NAND code saved the environment in the first NAND
345 * device i.e., nand_dev_desc + 0. This is also the behaviour using
348 static int env_nand_load(void)
350 #if !defined(ENV_IS_EMBEDDED)
352 ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
354 #if defined(CONFIG_ENV_OFFSET_OOB)
355 struct mtd_info *mtd = get_nand_dev_by_index(0);
357 * If unable to read environment offset from NAND OOB then fall through
358 * to the normal environment reading code below
360 if (mtd && !get_nand_env_oob(mtd, &nand_env_oob_offset)) {
361 printf("Found Environment offset in OOB..\n");
363 env_set_default("no env offset in OOB", 0);
368 ret = readenv(CONFIG_ENV_OFFSET, (u_char *)buf);
370 env_set_default("readenv() failed", 0);
374 return env_import(buf, 1);
375 #endif /* ! ENV_IS_EMBEDDED */
379 #endif /* CONFIG_ENV_OFFSET_REDUND */
381 U_BOOT_ENV_LOCATION(nand) = {
382 .location = ENVL_NAND,
384 .load = env_nand_load,
385 #if defined(CMD_SAVEENV)
386 .save = env_save_ptr(env_nand_save),
388 .init = env_nand_init,