3 * Jian Zhang, Texas Instruments, jzhang@ti.com.
5 * (C) Copyright 2000-2006
6 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
8 * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
9 * Andreas Heppel <aheppel@sysgo.de>
11 * See file CREDITS for list of people who contributed to this
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License as
16 * published by the Free Software Foundation; either version 2 of
17 * the License, or (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
34 #if defined(CFG_ENV_IS_IN_NAND) /* Environment is in Nand Flash */
37 #include <environment.h>
38 #include <linux/stddef.h>
42 #if defined(CONFIG_CMD_ENV) && defined(CONFIG_CMD_NAND)
44 #elif defined(CFG_ENV_OFFSET_REDUND)
45 #error Cannot use CFG_ENV_OFFSET_REDUND without CONFIG_CMD_ENV & CONFIG_CMD_NAND
48 #if defined(CFG_ENV_SIZE_REDUND) && (CFG_ENV_SIZE_REDUND != CFG_ENV_SIZE)
49 #error CFG_ENV_SIZE_REDUND should be the same as CFG_ENV_SIZE
53 #error CONFIG_INFERNO not supported yet
56 int nand_legacy_rw (struct nand_chip* nand, int cmd,
57 size_t start, size_t len,
58 size_t * retlen, u_char * buf);
60 /* info for NAND chips, defined in drivers/mtd/nand/nand.c */
61 extern nand_info_t nand_info[];
63 /* references to names in env_common.c */
64 extern uchar default_environment[];
65 extern int default_environment_size;
67 char * env_name_spec = "NAND";
70 #ifdef ENV_IS_EMBEDDED
71 extern uchar environment[];
72 env_t *env_ptr = (env_t *)(&environment[0]);
73 #else /* ! ENV_IS_EMBEDDED */
75 #endif /* ENV_IS_EMBEDDED */
79 #if !defined(ENV_IS_EMBEDDED)
80 static void use_default(void);
83 DECLARE_GLOBAL_DATA_PTR;
85 uchar env_get_char_spec (int index)
87 return ( *((uchar *)(gd->env_addr + index)) );
91 /* this is called before nand_init()
92 * so we can't read Nand to validate env data.
93 * Mark it OK for now. env_relocate() in env_common.c
94 * will call our relocate function which will does
95 * the real validation.
97 * When using a NAND boot image (like sequoia_nand), the environment
98 * can be embedded or attached to the U-Boot image in NAND flash. This way
99 * the SPL loads not only the U-Boot image from NAND but also the
104 #if defined(ENV_IS_EMBEDDED)
106 int crc1_ok = 0, crc2_ok = 0;
107 env_t *tmp_env1, *tmp_env2;
109 total = CFG_ENV_SIZE;
112 tmp_env2 = (env_t *)((ulong)env_ptr + CFG_ENV_SIZE);
114 crc1_ok = (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
115 crc2_ok = (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
117 if (!crc1_ok && !crc2_ok)
119 else if(crc1_ok && !crc2_ok)
121 else if(!crc1_ok && crc2_ok)
124 /* both ok - check serial */
125 if(tmp_env1->flags == 255 && tmp_env2->flags == 0)
127 else if(tmp_env2->flags == 255 && tmp_env1->flags == 0)
129 else if(tmp_env1->flags > tmp_env2->flags)
131 else if(tmp_env2->flags > tmp_env1->flags)
133 else /* flags are equal - almost impossible */
137 if (gd->env_valid == 1)
139 else if (gd->env_valid == 2)
141 #else /* ENV_IS_EMBEDDED */
142 gd->env_addr = (ulong)&default_environment[0];
144 #endif /* ENV_IS_EMBEDDED */
151 * The legacy NAND code saved the environment in the first NAND device i.e.,
152 * nand_dev_desc + 0. This is also the behaviour using the new NAND code.
154 #ifdef CFG_ENV_OFFSET_REDUND
161 total = CFG_ENV_SIZE;
163 if(gd->env_valid == 1) {
164 puts ("Erasing redundant Nand...");
165 if (nand_erase(&nand_info[0],
166 CFG_ENV_OFFSET_REDUND, CFG_ENV_SIZE))
168 puts ("Writing to redundant Nand... ");
169 ret = nand_write(&nand_info[0], CFG_ENV_OFFSET_REDUND, &total,
172 puts ("Erasing Nand...");
173 if (nand_erase(&nand_info[0],
174 CFG_ENV_OFFSET, CFG_ENV_SIZE))
177 puts ("Writing to Nand... ");
178 ret = nand_write(&nand_info[0], CFG_ENV_OFFSET, &total,
181 if (ret || total != CFG_ENV_SIZE)
185 gd->env_valid = (gd->env_valid == 2 ? 1 : 2);
188 #else /* ! CFG_ENV_OFFSET_REDUND */
194 puts ("Erasing Nand...");
195 if (nand_erase(&nand_info[0], CFG_ENV_OFFSET, CFG_ENV_SIZE))
198 puts ("Writing to Nand... ");
199 total = CFG_ENV_SIZE;
200 ret = nand_write(&nand_info[0], CFG_ENV_OFFSET, &total, (u_char*)env_ptr);
201 if (ret || total != CFG_ENV_SIZE)
207 #endif /* CFG_ENV_OFFSET_REDUND */
208 #endif /* CMD_SAVEENV */
210 #ifdef CFG_ENV_OFFSET_REDUND
211 void env_relocate_spec (void)
213 #if !defined(ENV_IS_EMBEDDED)
215 int crc1_ok = 0, crc2_ok = 0;
216 env_t *tmp_env1, *tmp_env2;
218 total = CFG_ENV_SIZE;
220 tmp_env1 = (env_t *) malloc(CFG_ENV_SIZE);
221 tmp_env2 = (env_t *) malloc(CFG_ENV_SIZE);
223 nand_read(&nand_info[0], CFG_ENV_OFFSET, &total,
225 nand_read(&nand_info[0], CFG_ENV_OFFSET_REDUND, &total,
228 crc1_ok = (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
229 crc2_ok = (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
231 if(!crc1_ok && !crc2_ok)
232 return use_default();
233 else if(crc1_ok && !crc2_ok)
235 else if(!crc1_ok && crc2_ok)
238 /* both ok - check serial */
239 if(tmp_env1->flags == 255 && tmp_env2->flags == 0)
241 else if(tmp_env2->flags == 255 && tmp_env1->flags == 0)
243 else if(tmp_env1->flags > tmp_env2->flags)
245 else if(tmp_env2->flags > tmp_env1->flags)
247 else /* flags are equal - almost impossible */
253 if(gd->env_valid == 1) {
261 #endif /* ! ENV_IS_EMBEDDED */
263 #else /* ! CFG_ENV_OFFSET_REDUND */
265 * The legacy NAND code saved the environment in the first NAND device i.e.,
266 * nand_dev_desc + 0. This is also the behaviour using the new NAND code.
268 void env_relocate_spec (void)
270 #if !defined(ENV_IS_EMBEDDED)
274 total = CFG_ENV_SIZE;
275 ret = nand_read(&nand_info[0], CFG_ENV_OFFSET, &total, (u_char*)env_ptr);
276 if (ret || total != CFG_ENV_SIZE)
277 return use_default();
279 if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
280 return use_default();
281 #endif /* ! ENV_IS_EMBEDDED */
283 #endif /* CFG_ENV_OFFSET_REDUND */
285 #if !defined(ENV_IS_EMBEDDED)
286 static void use_default()
288 puts ("*** Warning - bad CRC or NAND, using default environment\n\n");
290 if (default_environment_size > CFG_ENV_SIZE){
291 puts ("*** Error - default environment is too large\n\n");
295 memset (env_ptr, 0, sizeof(env_t));
296 memcpy (env_ptr->data,
298 default_environment_size);
299 env_ptr->crc = crc32(0, env_ptr->data, ENV_SIZE);
305 #endif /* CFG_ENV_IS_IN_NAND */