2 * (C) Copyright 2008-2010 Freescale Semiconductor, Inc.
4 * See file CREDITS for list of people who contributed to this
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of
10 * the License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
28 #include <environment.h>
29 #include <linux/stddef.h>
33 /* references to names in env_common.c */
34 extern uchar default_environment[];
36 char *env_name_spec = "MMC";
38 #ifdef ENV_IS_EMBEDDED
39 extern uchar environment[];
40 env_t *env_ptr = (env_t *)(&environment[0]);
41 #else /* ! ENV_IS_EMBEDDED */
43 #endif /* ENV_IS_EMBEDDED */
45 static int mmc_env_devno;
48 #if !defined(ENV_IS_EMBEDDED)
49 static void use_default(void);
52 DECLARE_GLOBAL_DATA_PTR;
54 uchar env_get_char_spec(int index)
56 return *((uchar *)(gd->env_addr + index));
62 gd->env_addr = (ulong)&default_environment[0];
65 #ifdef CONFIG_DYNAMIC_MMC_DEVNO
66 mmc_env_devno = get_mmc_env_devno();
68 mmc_env_devno = CONFIG_SYS_MMC_ENV_DEV;
74 int init_mmc_for_env(struct mmc *mmc)
77 puts("No MMC card found\n");
82 puts("MMC init failed\n");
89 #ifdef CONFIG_CMD_SAVEENV
91 inline int write_env(struct mmc *mmc, unsigned long size,
92 unsigned long offset, const void *buffer)
94 uint blk_start, blk_cnt, n;
96 blk_start = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
97 blk_cnt = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
99 n = mmc->block_dev.block_write(mmc_env_devno, blk_start,
100 blk_cnt, (u_char *)buffer);
102 return (n == blk_cnt) ? 0 : -1;
107 struct mmc *mmc = find_mmc_device(mmc_env_devno);
109 if (init_mmc_for_env(mmc))
112 printf("Writing to MMC(%d)... ", mmc_env_devno);
113 if (write_env(mmc, CONFIG_ENV_SIZE, CONFIG_ENV_OFFSET, env_ptr)) {
121 #endif /* CONFIG_CMD_SAVEENV */
123 inline int read_env(struct mmc *mmc, unsigned long size,
124 unsigned long offset, const void *buffer)
126 uint blk_start, blk_cnt, n;
128 blk_start = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
129 blk_cnt = ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;
131 n = mmc->block_dev.block_read(mmc_env_devno, blk_start,
132 blk_cnt, (uchar *)buffer);
134 return (n == blk_cnt) ? 0 : -1;
137 void env_relocate_spec(void)
139 #if !defined(ENV_IS_EMBEDDED)
140 struct mmc *mmc = find_mmc_device(mmc_env_devno);
142 if (init_mmc_for_env(mmc))
145 if (read_env(mmc, CONFIG_ENV_SIZE, CONFIG_ENV_OFFSET, env_ptr))
146 return use_default();
148 if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
149 return use_default();
155 #if !defined(ENV_IS_EMBEDDED)
156 static void use_default()
158 puts ("*** Warning - bad CRC or MMC, using default environment\n\n");