/* * (C) Copyright 2002 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ #ifndef _ENVIRONMENT_H_ #define _ENVIRONMENT_H_ 1 /************************************************************************** * * The "environment" is stored as a list of '\0' terminated * "name=value" strings. The end of the list is marked by a double * '\0'. New entries are always added at the end. Deleting an entry * shifts the remaining entries to the front. Replacing an entry is a * combination of deleting the old value and adding the new one. * * The environment is preceeded by a 32 bit CRC over the data part. * ************************************************************************** */ #if defined(CFG_ENV_IS_IN_FLASH) # ifndef CFG_ENV_ADDR # define CFG_ENV_ADDR (CFG_FLASH_BASE + CFG_ENV_OFFSET) # endif # ifndef CFG_ENV_OFFSET # define CFG_ENV_OFFSET (CFG_ENV_ADDR - CFG_FLASH_BASE) # endif # if !defined(CFG_ENV_ADDR_REDUND) && defined(CFG_ENV_OFFSET_REDUND) # define CFG_ENV_ADDR_REDUND (CFG_FLASH_BASE + CFG_ENV_OFFSET_REDUND) # endif # if defined(CFG_ENV_SECT_SIZE) || defined(CFG_ENV_SIZE) # ifndef CFG_ENV_SECT_SIZE # define CFG_ENV_SECT_SIZE CFG_ENV_SIZE # endif # ifndef CFG_ENV_SIZE # define CFG_ENV_SIZE CFG_ENV_SECT_SIZE # endif # else # error "Both CFG_ENV_SECT_SIZE and CFG_ENV_SIZE undefined" # endif # if defined(CFG_ENV_ADDR_REDUND) && !defined(CFG_ENV_SIZE_REDUND) # define CFG_ENV_SIZE_REDUND CFG_ENV_SIZE # endif # if (CFG_ENV_ADDR >= CFG_MONITOR_BASE) && \ (CFG_ENV_ADDR+CFG_ENV_SIZE) <= (CFG_MONITOR_BASE + CFG_MONITOR_LEN) # define ENV_IS_EMBEDDED 1 # endif # if defined(CFG_ENV_ADDR_REDUND) || defined(CFG_ENV_OFFSET_REDUND) # define CFG_REDUNDAND_ENVIRONMENT 1 # endif #endif /* CFG_ENV_IS_IN_FLASH */ #if defined(CFG_ENV_IS_IN_NAND) # ifndef CFG_ENV_OFFSET # error "Need to define CFG_ENV_OFFSET when using CFG_ENV_IS_IN_NAND" # endif # ifndef CFG_ENV_SIZE # error "Need to define CFG_ENV_SIZE when using CFG_ENV_IS_IN_NAND" # endif # ifdef CFG_ENV_OFFSET_REDUND # define CFG_REDUNDAND_ENVIRONMENT # endif # ifdef CFG_ENV_IS_EMBEDDED # define ENV_IS_EMBEDDED 1 # endif #endif /* CFG_ENV_IS_IN_NAND */ #ifdef USE_HOSTCC # include <stdint.h> #else # include <linux/types.h> #endif #ifdef CFG_REDUNDAND_ENVIRONMENT # define ENV_HEADER_SIZE (sizeof(uint32_t) + 1) #else # define ENV_HEADER_SIZE (sizeof(uint32_t)) #endif #define ENV_SIZE (CFG_ENV_SIZE - ENV_HEADER_SIZE) typedef struct environment_s { uint32_t crc; /* CRC32 over data bytes */ #ifdef CFG_REDUNDAND_ENVIRONMENT unsigned char flags; /* active/obsolete flags */ #endif unsigned char data[ENV_SIZE]; /* Environment data */ } env_t; /* Pointer to function that returns a character from the environment */ extern unsigned char (*env_get_char)(int); /* Function that returns a pointer to a value from the environment */ unsigned char *env_get_addr(int); unsigned char env_get_char_memory (int index); /* Function that updates CRC of the enironment */ void env_crc_update (void); #endif /* _ENVIRONMENT_H_ */