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>
34 /* references to names in env_common.c */
35 extern uchar default_environment[];
37 char *env_name_spec = "MMC";
39 #ifdef ENV_IS_EMBEDDED
40 extern uchar environment[];
41 env_t *env_ptr = (env_t *)(&environment[0]);
42 #else /* ! ENV_IS_EMBEDDED */
43 env_t *env_ptr = NULL;
44 #endif /* ENV_IS_EMBEDDED */
47 #if !defined(ENV_IS_EMBEDDED)
48 static void use_default(void);
51 DECLARE_GLOBAL_DATA_PTR;
53 uchar env_get_char_spec(int index)
55 return *((uchar *)(gd->env_addr + index));
61 gd->env_addr = (ulong)&default_environment[0];
67 int init_mmc_for_env(struct mmc *mmc)
70 puts("No MMC card found\n");
75 puts("MMC init failed\n");
82 #ifdef CONFIG_CMD_SAVEENV
84 inline int write_env(struct mmc *mmc, unsigned long size,
85 unsigned long offset, const void *buffer)
87 uint blk_start, blk_cnt, n;
89 blk_start = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
90 blk_cnt = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
92 n = mmc->block_dev.block_write(CONFIG_SYS_MMC_ENV_DEV, blk_start,
93 blk_cnt, (u_char *)buffer);
95 return (n == blk_cnt) ? 0 : -1;
103 struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
105 if (init_mmc_for_env(mmc))
108 res = (char *)&env_new.data;
109 len = hexport('\0', &res, ENV_SIZE);
111 error("Cannot export environment: errno = %d\n", errno);
114 env_new.crc = crc32(0, env_new.data, ENV_SIZE);
115 printf("Writing to MMC(%d)... ", CONFIG_SYS_MMC_ENV_DEV);
116 if (write_env(mmc, CONFIG_ENV_SIZE, CONFIG_ENV_OFFSET, (u_char *)&env_new)) {
124 #endif /* CONFIG_CMD_SAVEENV */
126 inline int read_env(struct mmc *mmc, unsigned long size,
127 unsigned long offset, const void *buffer)
129 uint blk_start, blk_cnt, n;
131 blk_start = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
132 blk_cnt = ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;
134 n = mmc->block_dev.block_read(CONFIG_SYS_MMC_ENV_DEV, blk_start,
135 blk_cnt, (uchar *)buffer);
137 return (n == blk_cnt) ? 0 : -1;
140 void env_relocate_spec(void)
142 #if !defined(ENV_IS_EMBEDDED)
143 char buf[CONFIG_ENV_SIZE];
145 struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
147 if (init_mmc_for_env(mmc)) {
152 if (read_env(mmc, CONFIG_ENV_SIZE, CONFIG_ENV_OFFSET, buf)) {
161 #if !defined(ENV_IS_EMBEDDED)
162 static void use_default()
164 set_default_env(NULL);