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);
82 uchar env_get_char_spec (int index)
84 DECLARE_GLOBAL_DATA_PTR;
86 return ( *((uchar *)(gd->env_addr + index)) );
90 /* this is called before nand_init()
91 * so we can't read Nand to validate env data.
92 * Mark it OK for now. env_relocate() in env_common.c
93 * will call our relocate function which will does
94 * the real validation.
98 DECLARE_GLOBAL_DATA_PTR;
100 gd->env_addr = (ulong)&default_environment[0];
108 * The legacy NAND code saved the environment in the first NAND device i.e.,
109 * nand_dev_desc + 0. This is also the behaviour using the new NAND code.
111 #ifdef CFG_ENV_OFFSET_REDUND
116 DECLARE_GLOBAL_DATA_PTR;
119 total = CFG_ENV_SIZE;
121 if(gd->env_valid == 1) {
122 puts ("Erasing redundant Nand...");
123 if (nand_erase(&nand_info[0],
124 CFG_ENV_OFFSET_REDUND, CFG_ENV_SIZE))
126 puts ("Writing to redundant Nand... ");
127 ret = nand_write(&nand_info[0], CFG_ENV_OFFSET_REDUND, &total,
130 puts ("Erasing Nand...");
131 if (nand_erase(&nand_info[0],
132 CFG_ENV_OFFSET, CFG_ENV_SIZE))
135 puts ("Writing to Nand... ");
136 ret = nand_write(&nand_info[0], CFG_ENV_OFFSET, &total,
139 if (ret || total != CFG_ENV_SIZE)
143 gd->env_valid = (gd->env_valid == 2 ? 1 : 2);
146 #else /* ! CFG_ENV_OFFSET_REDUND */
151 puts ("Erasing Nand...");
152 if (nand_erase(&nand_info[0], CFG_ENV_OFFSET, CFG_ENV_SIZE))
155 puts ("Writing to Nand... ");
156 total = CFG_ENV_SIZE;
157 ret = nand_write(&nand_info[0], CFG_ENV_OFFSET, &total,
159 if (ret || total != CFG_ENV_SIZE)
165 #endif /* CFG_ENV_OFFSET_REDUND */
166 #endif /* CMD_SAVEENV */
168 #ifdef CFG_ENV_OFFSET_REDUND
169 void env_relocate_spec (void)
171 #if !defined(ENV_IS_EMBEDDED)
172 int crc1_ok = 0, crc2_ok = 0, total;
173 env_t *tmp_env1, *tmp_env2;
175 DECLARE_GLOBAL_DATA_PTR;
177 total = CFG_ENV_SIZE;
179 tmp_env1 = (env_t *) malloc(CFG_ENV_SIZE);
180 tmp_env2 = (env_t *) malloc(CFG_ENV_SIZE);
182 nand_read(&nand_info[0], CFG_ENV_OFFSET, &total,
184 nand_read(&nand_info[0], CFG_ENV_OFFSET_REDUND, &total,
187 crc1_ok = (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
188 crc2_ok = (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
190 if(!crc1_ok && !crc2_ok)
191 return use_default();
192 else if(crc1_ok && !crc2_ok)
194 else if(!crc1_ok && crc2_ok)
197 /* both ok - check serial */
198 if(tmp_env1->flags == 255 && tmp_env2->flags == 0)
200 else if(tmp_env2->flags == 255 && tmp_env1->flags == 0)
202 else if(tmp_env1->flags > tmp_env2->flags)
204 else if(tmp_env2->flags > tmp_env1->flags)
206 else /* flags are equal - almost impossible */
212 if(gd->env_valid == 1) {
220 #endif /* ! ENV_IS_EMBEDDED */
222 #else /* ! CFG_ENV_OFFSET_REDUND */
224 * The legacy NAND code saved the environment in the first NAND device i.e.,
225 * nand_dev_desc + 0. This is also the behaviour using the new NAND code.
227 void env_relocate_spec (void)
229 #if !defined(ENV_IS_EMBEDDED)
232 total = CFG_ENV_SIZE;
233 ret = nand_read(&nand_info[0], CFG_ENV_OFFSET, &total,
235 if (ret || total != CFG_ENV_SIZE)
236 return use_default();
238 if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
239 return use_default();
240 #endif /* ! ENV_IS_EMBEDDED */
242 #endif /* CFG_ENV_OFFSET_REDUND */
244 static void use_default()
246 DECLARE_GLOBAL_DATA_PTR;
248 puts ("*** Warning - bad CRC or NAND, using default environment\n\n");
250 if (default_environment_size > CFG_ENV_SIZE){
251 puts ("*** Error - default environment is too large\n\n");
255 memset (env_ptr, 0, sizeof(env_t));
256 memcpy (env_ptr->data,
258 default_environment_size);
259 env_ptr->crc = crc32(0, env_ptr->data, ENV_SIZE);
264 #endif /* CFG_ENV_IS_IN_NAND */