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>
18 #include <environment.h>
19 #include <linux/stddef.h>
26 #if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_NAND) && \
27 !defined(CONFIG_SPL_BUILD)
29 #elif defined(CONFIG_ENV_OFFSET_REDUND)
30 #error CONFIG_ENV_OFFSET_REDUND must have CONFIG_CMD_SAVEENV & CONFIG_CMD_NAND
33 #if defined(CONFIG_ENV_SIZE_REDUND) && \
34 (CONFIG_ENV_SIZE_REDUND != CONFIG_ENV_SIZE)
35 #error CONFIG_ENV_SIZE_REDUND should be the same as CONFIG_ENV_SIZE
38 #ifndef CONFIG_ENV_RANGE
39 #define CONFIG_ENV_RANGE CONFIG_ENV_SIZE
42 #if defined(ENV_IS_EMBEDDED)
43 static env_t *env_ptr = &environment;
44 #elif defined(CONFIG_NAND_ENV_DST)
45 static env_t *env_ptr = (env_t *)CONFIG_NAND_ENV_DST;
46 #endif /* ENV_IS_EMBEDDED */
48 DECLARE_GLOBAL_DATA_PTR;
51 * This is called before nand_init() so we can't read NAND to
54 * Mark it OK for now. env_relocate() in env_common.c will call our
55 * relocate function which does the real validation.
57 * When using a NAND boot image (like sequoia_nand), the environment
58 * can be embedded or attached to the U-Boot image in NAND flash.
59 * This way the SPL loads not only the U-Boot image from NAND but
60 * also the environment.
62 static int env_nand_init(void)
64 #if defined(ENV_IS_EMBEDDED) || defined(CONFIG_NAND_ENV_DST)
65 int crc1_ok = 0, crc2_ok = 0;
68 #ifdef CONFIG_ENV_OFFSET_REDUND
71 tmp_env2 = (env_t *)((ulong)env_ptr + CONFIG_ENV_SIZE);
72 crc2_ok = crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc;
75 crc1_ok = crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc;
77 if (!crc1_ok && !crc2_ok) {
79 gd->env_valid = ENV_INVALID;
82 } else if (crc1_ok && !crc2_ok) {
83 gd->env_valid = ENV_VALID;
85 #ifdef CONFIG_ENV_OFFSET_REDUND
86 else if (!crc1_ok && crc2_ok) {
87 gd->env_valid = ENV_REDUND;
89 /* both ok - check serial */
90 if (tmp_env1->flags == 255 && tmp_env2->flags == 0)
91 gd->env_valid = ENV_REDUND;
92 else if (tmp_env2->flags == 255 && tmp_env1->flags == 0)
93 gd->env_valid = ENV_VALID;
94 else if (tmp_env1->flags > tmp_env2->flags)
95 gd->env_valid = ENV_VALID;
96 else if (tmp_env2->flags > tmp_env1->flags)
97 gd->env_valid = ENV_REDUND;
98 else /* flags are equal - almost impossible */
99 gd->env_valid = ENV_VALID;
102 if (gd->env_valid == ENV_REDUND)
106 if (gd->env_valid == ENV_VALID)
109 gd->env_addr = (ulong)env_ptr->data;
111 #else /* ENV_IS_EMBEDDED || CONFIG_NAND_ENV_DST */
112 gd->env_addr = (ulong)&default_environment[0];
113 gd->env_valid = ENV_VALID;
114 #endif /* ENV_IS_EMBEDDED || CONFIG_NAND_ENV_DST */
121 * The legacy NAND code saved the environment in the first NAND device i.e.,
122 * nand_dev_desc + 0. This is also the behaviour using the new NAND code.
124 static int writeenv(size_t offset, u_char *buf)
126 size_t end = offset + CONFIG_ENV_RANGE;
127 size_t amount_saved = 0;
128 size_t blocksize, len;
129 struct mtd_info *mtd;
132 mtd = get_nand_dev_by_index(0);
136 blocksize = mtd->erasesize;
137 len = min(blocksize, (size_t)CONFIG_ENV_SIZE);
139 while (amount_saved < CONFIG_ENV_SIZE && offset < end) {
140 if (nand_block_isbad(mtd, offset)) {
143 char_ptr = &buf[amount_saved];
144 if (nand_write(mtd, offset, &len, char_ptr))
151 if (amount_saved != CONFIG_ENV_SIZE)
157 struct nand_env_location {
159 const nand_erase_options_t erase_opts;
162 static int erase_and_write_env(const struct nand_env_location *location,
165 struct mtd_info *mtd;
168 mtd = get_nand_dev_by_index(0);
172 printf("Erasing %s...\n", location->name);
173 if (nand_erase_opts(mtd, &location->erase_opts))
176 printf("Writing to %s... ", location->name);
177 ret = writeenv(location->erase_opts.offset, env_new);
178 puts(ret ? "FAILED!\n" : "OK\n");
183 static int env_nand_save(void)
186 ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
188 static const struct nand_env_location location[] = {
192 .length = CONFIG_ENV_RANGE,
193 .offset = CONFIG_ENV_OFFSET,
196 #ifdef CONFIG_ENV_OFFSET_REDUND
198 .name = "redundant NAND",
200 .length = CONFIG_ENV_RANGE,
201 .offset = CONFIG_ENV_OFFSET_REDUND,
208 if (CONFIG_ENV_RANGE < CONFIG_ENV_SIZE)
211 ret = env_export(env_new);
215 #ifdef CONFIG_ENV_OFFSET_REDUND
216 env_idx = (gd->env_valid == ENV_VALID);
219 ret = erase_and_write_env(&location[env_idx], (u_char *)env_new);
220 #ifdef CONFIG_ENV_OFFSET_REDUND
222 /* preset other copy for next write */
223 gd->env_valid = gd->env_valid == ENV_REDUND ? ENV_VALID :
228 env_idx = (env_idx + 1) & 1;
229 ret = erase_and_write_env(&location[env_idx], (u_char *)env_new);
231 printf("Warning: primary env write failed,"
232 " redundancy is lost!\n");
237 #endif /* CMD_SAVEENV */
239 #if defined(CONFIG_SPL_BUILD)
240 static int readenv(size_t offset, u_char *buf)
242 return nand_spl_load_image(offset, CONFIG_ENV_SIZE, buf);
245 static int readenv(size_t offset, u_char *buf)
247 size_t end = offset + CONFIG_ENV_RANGE;
248 size_t amount_loaded = 0;
249 size_t blocksize, len;
250 struct mtd_info *mtd;
253 mtd = get_nand_dev_by_index(0);
257 blocksize = mtd->erasesize;
258 len = min(blocksize, (size_t)CONFIG_ENV_SIZE);
260 while (amount_loaded < CONFIG_ENV_SIZE && offset < end) {
261 if (nand_block_isbad(mtd, offset)) {
264 char_ptr = &buf[amount_loaded];
265 if (nand_read_skip_bad(mtd, offset,
267 mtd->size, char_ptr))
271 amount_loaded += len;
275 if (amount_loaded != CONFIG_ENV_SIZE)
280 #endif /* #if defined(CONFIG_SPL_BUILD) */
282 #ifdef CONFIG_ENV_OFFSET_OOB
283 int get_nand_env_oob(struct mtd_info *mtd, unsigned long *result)
285 struct mtd_oob_ops ops;
286 uint32_t oob_buf[ENV_OFFSET_SIZE / sizeof(uint32_t)];
290 ops.mode = MTD_OOB_AUTO;
292 ops.ooblen = ENV_OFFSET_SIZE;
293 ops.oobbuf = (void *)oob_buf;
295 ret = mtd->read_oob(mtd, ENV_OFFSET_SIZE, &ops);
297 printf("error reading OOB block 0\n");
301 if (oob_buf[0] == ENV_OOB_MARKER) {
302 *result = ovoid ob_buf[1] * mtd->erasesize;
303 } else if (oob_buf[0] == ENV_OOB_MARKER_OLD) {
304 *result = oob_buf[1];
306 printf("No dynamic environment marker in OOB block 0\n");
314 #ifdef CONFIG_ENV_OFFSET_REDUND
315 static int env_nand_load(void)
317 #if defined(ENV_IS_EMBEDDED)
320 int read1_fail, read2_fail;
321 env_t *tmp_env1, *tmp_env2;
324 tmp_env1 = (env_t *)malloc(CONFIG_ENV_SIZE);
325 tmp_env2 = (env_t *)malloc(CONFIG_ENV_SIZE);
326 if (tmp_env1 == NULL || tmp_env2 == NULL) {
327 puts("Can't allocate buffers for environment\n");
328 set_default_env("malloc() failed", 0);
333 read1_fail = readenv(CONFIG_ENV_OFFSET, (u_char *) tmp_env1);
334 read2_fail = readenv(CONFIG_ENV_OFFSET_REDUND, (u_char *) tmp_env2);
336 ret = env_import_redund((char *)tmp_env1, read1_fail, (char *)tmp_env2,
344 #endif /* ! ENV_IS_EMBEDDED */
346 #else /* ! CONFIG_ENV_OFFSET_REDUND */
348 * The legacy NAND code saved the environment in the first NAND
349 * device i.e., nand_dev_desc + 0. This is also the behaviour using
352 static int env_nand_load(void)
354 #if !defined(ENV_IS_EMBEDDED)
356 ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
358 #if defined(CONFIG_ENV_OFFSET_OOB)
359 struct mtd_info *mtd = get_nand_dev_by_index(0);
361 * If unable to read environment offset from NAND OOB then fall through
362 * to the normal environment reading code below
364 if (mtd && !get_nand_env_oob(mtd, &nand_env_oob_offset)) {
365 printf("Found Environment offset in OOB..\n");
367 set_default_env("no env offset in OOB", 0);
372 ret = readenv(CONFIG_ENV_OFFSET, (u_char *)buf);
374 set_default_env("readenv() failed", 0);
378 return env_import(buf, 1);
379 #endif /* ! ENV_IS_EMBEDDED */
383 #endif /* CONFIG_ENV_OFFSET_REDUND */
385 U_BOOT_ENV_LOCATION(nand) = {
386 .location = ENVL_NAND,
388 .load = env_nand_load,
389 #if defined(CMD_SAVEENV)
390 .save = env_save_ptr(env_nand_save),
392 .init = env_nand_init,