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author | H. Nikolaus Schaller <hns@goldelico.com> | 2012-03-26 20:55:28 +0200 |
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committer | H. Nikolaus Schaller <hns@goldelico.com> | 2012-03-26 20:55:28 +0200 |
commit | 92988a21ad4c4c9504295ccb580c9f806134471b (patch) | |
tree | 5effc9f14170112450de05c67dafbe8d5034d595 /u-boot/common/env_nvram.c | |
parent | ca2b506783b676c95762c54ea24dcfdaae1947c9 (diff) | |
download | bootable_bootloader_goldelico_gta04-92988a21ad4c4c9504295ccb580c9f806134471b.zip bootable_bootloader_goldelico_gta04-92988a21ad4c4c9504295ccb580c9f806134471b.tar.gz bootable_bootloader_goldelico_gta04-92988a21ad4c4c9504295ccb580c9f806134471b.tar.bz2 |
added boot script files to repository
Diffstat (limited to 'u-boot/common/env_nvram.c')
-rw-r--r-- | u-boot/common/env_nvram.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/u-boot/common/env_nvram.c b/u-boot/common/env_nvram.c new file mode 100644 index 0000000..544ce47 --- /dev/null +++ b/u-boot/common/env_nvram.c @@ -0,0 +1,140 @@ +/* + * (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); +} |