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Diffstat (limited to 'common/env_nvram.c')
| -rw-r--r-- | common/env_nvram.c | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/common/env_nvram.c b/common/env_nvram.c new file mode 100644 index 000000000..fdfa4fcb6 --- /dev/null +++ b/common/env_nvram.c @@ -0,0 +1,138 @@ +/* + * (C) Copyright 2000-2002 + * 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 CFG_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> + +#ifdef CFG_ENV_IS_IN_NVRAM /* Environment is in NVRAM */ + +#include <command.h> +#include <environment.h> +#include <cmd_nvedit.h> +#include <linux/stddef.h> +#include <malloc.h> + +#ifdef CFG_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 *)CFG_ENV_ADDR; +#endif + +char * env_name_spec = "NVRAM"; + +extern uchar default_environment[]; +extern int default_environment_size; + +extern uchar (*env_get_char)(int); +extern uchar env_get_char_memory (int index); + + +uchar env_get_char_spec (int index) +{ +#ifdef CFG_NVRAM_ACCESS_ROUTINE + uchar c; + + nvram_read(&c, CFG_ENV_ADDR+index, 1); + + return c; +#else + DECLARE_GLOBAL_DATA_PTR; + + return *((uchar *)(gd->env_addr + index)); +#endif +} + +void env_relocate_spec (void) +{ +#if defined(CFG_NVRAM_ACCESS_ROUTINE) + nvram_read(env_ptr, CFG_ENV_ADDR, CFG_ENV_SIZE); +#else + memcpy (env_ptr, (void*)CFG_ENV_ADDR, CFG_ENV_SIZE); +#endif +} + +int saveenv (void) +{ + int rcode = 0; + +#ifdef CFG_NVRAM_ACCESS_ROUTINE + nvram_write(CFG_ENV_ADDR, env_ptr, CFG_ENV_SIZE); +#else + if (memcpy ((char *)CFG_ENV_ADDR, env_ptr, CFG_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) +{ + DECLARE_GLOBAL_DATA_PTR; + +#if defined(CFG_NVRAM_ACCESS_ROUTINE) + ulong crc; + uchar data[ENV_SIZE]; + nvram_read (&crc, CFG_ENV_ADDR, sizeof(ulong)); + nvram_read (data, CFG_ENV_ADDR+sizeof(ulong), ENV_SIZE); + + if (crc32(0, data, ENV_SIZE) == crc) { + gd->env_addr = (ulong)CFG_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); +} + +#endif /* CFG_ENV_IS_IN_NVRAM */ |