/* * (C) Copyright 2000-2010 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com> * Andreas Heppel <aheppel@sysgo.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 */ /* * 09-18-2001 Andreas Heppel, Sysgo RTS GmbH <aheppel@sysgo.de> * * It might not be possible in all cases to use 'memcpy()' to copy * the environment to NVRAM, as the NVRAM might not be mapped into * the memory space. (I.e. this is the case for the BAB750). In those * cases it might be possible to access the NVRAM using a different * method. For example, the RTC on the BAB750 is accessible in IO * space using its address and data registers. To enable usage of * NVRAM in those cases I invented the functions 'nvram_read()' and * 'nvram_write()', which will be activated upon the configuration * #define CONFIG_SYS_NVRAM_ACCESS_ROUTINE. Note, that those functions are * strongly dependent on the used HW, and must be redefined for each * board that wants to use them. */ #include <common.h> #include <command.h> #include <environment.h> #include <linux/stddef.h> #include <search.h> #include <errno.h> DECLARE_GLOBAL_DATA_PTR; #ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE extern void *nvram_read(void *dest, const long src, size_t count); extern void nvram_write(long dest, const void *src, size_t count); env_t *env_ptr = NULL; #else env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR; #endif char * env_name_spec = "NVRAM"; extern uchar default_environment[]; uchar env_get_char_spec(int index) { #ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE uchar c; nvram_read(&c, CONFIG_ENV_ADDR+index, 1); return c; #else return *((uchar *)(gd->env_addr + index)); #endif } void env_relocate_spec(void) { char buf[CONFIG_ENV_SIZE]; #if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE) nvram_read(buf, CONFIG_ENV_ADDR, CONFIG_ENV_SIZE); #else memcpy(buf, (void*)CONFIG_ENV_ADDR, CONFIG_ENV_SIZE); #endif env_import(buf, 1); } int saveenv(void) { env_t env_new; ssize_t len; char *res; int rcode = 0; res = (char *)&env_new.data; len = hexport_r(&env_htab, '\0', &res, ENV_SIZE); if (len < 0) { error("Cannot export environment: errno = %d\n", errno); return 1; } env_new.crc = crc32(0, env_new.data, ENV_SIZE); #ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE nvram_write(CONFIG_ENV_ADDR, &env_new, CONFIG_ENV_SIZE); #else if (memcpy((char *)CONFIG_ENV_ADDR, &env_new, CONFIG_ENV_SIZE) == NULL) rcode = 1; #endif return rcode; } /* * Initialize Environment use * * We are still running from ROM, so data use is limited */ int env_init(void) { #if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE) ulong crc; uchar data[ENV_SIZE]; nvram_read(&crc, CONFIG_ENV_ADDR, sizeof(ulong)); nvram_read(data, CONFIG_ENV_ADDR+sizeof(ulong), ENV_SIZE); if (crc32(0, data, ENV_SIZE) == crc) { gd->env_addr = (ulong)CONFIG_ENV_ADDR + sizeof(long); #else if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) { gd->env_addr = (ulong)&(env_ptr->data); #endif gd->env_valid = 1; } else { gd->env_addr = (ulong)&default_environment[0]; gd->env_valid = 0; } return (0); }