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/*
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* (C) Copyright 2008-2010 Freescale Semiconductor, Inc. |
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* |
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* See file CREDITS for list of people who contributed to this |
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* project. |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation; either version 2 of |
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* the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
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* MA 02111-1307 USA |
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*/ |
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/* #define DEBUG */ |
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#include <common.h> |
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#include <command.h> |
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#include <environment.h> |
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#include <linux/stddef.h> |
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#include <malloc.h> |
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#include <mmc.h> |
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/* references to names in env_common.c */ |
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extern uchar default_environment[]; |
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char *env_name_spec = "MMC"; |
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#ifdef ENV_IS_EMBEDDED |
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extern uchar environment[]; |
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env_t *env_ptr = (env_t *)(&environment[0]); |
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#else /* ! ENV_IS_EMBEDDED */ |
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env_t *env_ptr = NULL; |
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#endif /* ENV_IS_EMBEDDED */ |
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/* local functions */ |
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#if !defined(ENV_IS_EMBEDDED) |
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static void use_default(void); |
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#endif |
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DECLARE_GLOBAL_DATA_PTR; |
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uchar env_get_char_spec(int index) |
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{ |
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return *((uchar *)(gd->env_addr + index)); |
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} |
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int env_init(void) |
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{ |
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/* use default */ |
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gd->env_addr = (ulong)&default_environment[0]; |
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gd->env_valid = 1; |
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return 0; |
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} |
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int init_mmc_for_env(struct mmc *mmc) |
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{ |
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if (!mmc) { |
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puts("No MMC card found\n"); |
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return -1; |
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} |
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if (mmc_init(mmc)) { |
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puts("MMC init failed\n"); |
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return -1; |
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} |
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return 0; |
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} |
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#ifdef CONFIG_CMD_SAVEENV |
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inline int write_env(struct mmc *mmc, unsigned long size, |
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unsigned long offset, const void *buffer) |
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{ |
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uint blk_start, blk_cnt, n; |
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blk_start = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len; |
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blk_cnt = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len; |
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n = mmc->block_dev.block_write(CONFIG_SYS_MMC_ENV_DEV, blk_start, |
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blk_cnt, (u_char *)buffer); |
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return (n == blk_cnt) ? 0 : -1; |
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} |
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int saveenv(void) |
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{ |
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struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV); |
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if (init_mmc_for_env(mmc)) |
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return 1; |
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printf("Writing to MMC(%d)... ", CONFIG_SYS_MMC_ENV_DEV); |
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if (write_env(mmc, CONFIG_ENV_SIZE, CONFIG_ENV_OFFSET, env_ptr)) { |
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puts("failed\n"); |
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return 1; |
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} |
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puts("done\n"); |
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return 0; |
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} |
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#endif /* CONFIG_CMD_SAVEENV */ |
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inline int read_env(struct mmc *mmc, unsigned long size, |
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unsigned long offset, const void *buffer) |
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{ |
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uint blk_start, blk_cnt, n; |
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blk_start = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len; |
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blk_cnt = ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len; |
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n = mmc->block_dev.block_read(CONFIG_SYS_MMC_ENV_DEV, blk_start, |
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blk_cnt, (uchar *)buffer); |
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return (n == blk_cnt) ? 0 : -1; |
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} |
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void env_relocate_spec(void) |
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{ |
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#if !defined(ENV_IS_EMBEDDED) |
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struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV); |
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if (init_mmc_for_env(mmc)) |
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return; |
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if (read_env(mmc, CONFIG_ENV_SIZE, CONFIG_ENV_OFFSET, env_ptr)) |
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return use_default(); |
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if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc) |
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return use_default(); |
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gd->env_valid = 1; |
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#endif |
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} |
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#if !defined(ENV_IS_EMBEDDED) |
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static void use_default() |
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{ |
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puts ("*** Warning - bad CRC or MMC, using default environment\n\n"); |
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set_default_env(); |
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} |
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#endif |
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