3 * Jian Zhang, Texas Instruments, jzhang@ti.com.
5 * (C) Copyright 2000-2004
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 ((CONFIG_COMMANDS&(CFG_CMD_ENV|CFG_CMD_NAND)) == (CFG_CMD_ENV|CFG_CMD_NAND))
44 #elif defined(CFG_ENV_OFFSET_REDUND)
45 #error Cannot use CFG_ENV_OFFSET_REDUND without CFG_CMD_ENV & CFG_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/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 static void use_default(void);
81 DECLARE_GLOBAL_DATA_PTR;
83 uchar env_get_char_spec (int index)
85 return ( *((uchar *)(gd->env_addr + index)) );
89 /* this is called before nand_init()
90 * so we can't read Nand to validate env data.
91 * Mark it OK for now. env_relocate() in env_common.c
92 * will call our relocate function which will does
93 * the real validation.
97 gd->env_addr = (ulong)&default_environment[0];
105 * The legacy NAND code saved the environment in the first NAND device i.e.,
106 * nand_dev_desc + 0. This is also the behaviour using the new NAND code.
108 #ifdef CFG_ENV_OFFSET_REDUND
115 total = CFG_ENV_SIZE;
117 if(gd->env_valid == 1) {
118 puts ("Erasing redundant Nand...");
119 if (nand_erase(&nand_info[0],
120 CFG_ENV_OFFSET_REDUND, CFG_ENV_SIZE))
122 puts ("Writing to redundant Nand... ");
123 ret = nand_write(&nand_info[0], CFG_ENV_OFFSET_REDUND, &total,
126 puts ("Erasing Nand...");
127 if (nand_erase(&nand_info[0],
128 CFG_ENV_OFFSET, CFG_ENV_SIZE))
131 puts ("Writing to Nand... ");
132 ret = nand_write(&nand_info[0], CFG_ENV_OFFSET, &total,
135 if (ret || total != CFG_ENV_SIZE)
139 gd->env_valid = (gd->env_valid == 2 ? 1 : 2);
142 #else /* ! CFG_ENV_OFFSET_REDUND */
148 puts ("Erasing Nand...");
149 if (nand_erase(&nand_info[0], CFG_ENV_OFFSET, CFG_ENV_SIZE))
152 puts ("Writing to Nand... ");
153 total = CFG_ENV_SIZE;
154 ret = nand_write(&nand_info[0], CFG_ENV_OFFSET, &total, (u_char*)env_ptr);
155 if (ret || total != CFG_ENV_SIZE)
161 #endif /* CFG_ENV_OFFSET_REDUND */
162 #endif /* CMD_SAVEENV */
164 #ifdef CFG_ENV_OFFSET_REDUND
165 void env_relocate_spec (void)
167 #if !defined(ENV_IS_EMBEDDED)
169 int crc1_ok = 0, crc2_ok = 0;
170 env_t *tmp_env1, *tmp_env2;
172 total = CFG_ENV_SIZE;
174 tmp_env1 = (env_t *) malloc(CFG_ENV_SIZE);
175 tmp_env2 = (env_t *) malloc(CFG_ENV_SIZE);
177 nand_read(&nand_info[0], CFG_ENV_OFFSET, &total,
179 nand_read(&nand_info[0], CFG_ENV_OFFSET_REDUND, &total,
182 crc1_ok = (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
183 crc2_ok = (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
185 if(!crc1_ok && !crc2_ok)
186 return use_default();
187 else if(crc1_ok && !crc2_ok)
189 else if(!crc1_ok && crc2_ok)
192 /* both ok - check serial */
193 if(tmp_env1->flags == 255 && tmp_env2->flags == 0)
195 else if(tmp_env2->flags == 255 && tmp_env1->flags == 0)
197 else if(tmp_env1->flags > tmp_env2->flags)
199 else if(tmp_env2->flags > tmp_env1->flags)
201 else /* flags are equal - almost impossible */
207 if(gd->env_valid == 1) {
215 #endif /* ! ENV_IS_EMBEDDED */
217 #else /* ! CFG_ENV_OFFSET_REDUND */
219 * The legacy NAND code saved the environment in the first NAND device i.e.,
220 * nand_dev_desc + 0. This is also the behaviour using the new NAND code.
222 void env_relocate_spec (void)
224 #if !defined(ENV_IS_EMBEDDED)
228 total = CFG_ENV_SIZE;
229 ret = nand_read(&nand_info[0], CFG_ENV_OFFSET, &total, (u_char*)env_ptr);
230 if (ret || total != CFG_ENV_SIZE)
231 return use_default();
233 if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
234 return use_default();
235 #endif /* ! ENV_IS_EMBEDDED */
237 #endif /* CFG_ENV_OFFSET_REDUND */
239 static void use_default()
241 puts ("*** Warning - bad CRC or NAND, using default environment\n\n");
243 if (default_environment_size > CFG_ENV_SIZE){
244 puts ("*** Error - default environment is too large\n\n");
248 memset (env_ptr, 0, sizeof(env_t));
249 memcpy (env_ptr->data,
251 default_environment_size);
252 env_ptr->crc = crc32(0, env_ptr->data, ENV_SIZE);
257 #endif /* CFG_ENV_IS_IN_NAND */