diff options
| -rw-r--r-- | common/env_eeprom.c | 116 | ||||
| -rw-r--r-- | common/env_nowhere.c | 68 |
2 files changed, 184 insertions, 0 deletions
diff --git a/common/env_eeprom.c b/common/env_eeprom.c new file mode 100644 index 0000000000..9f1d82a798 --- /dev/null +++ b/common/env_eeprom.c @@ -0,0 +1,116 @@ +/* + * (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 + */ + +#include <common.h> + +#if defined(CFG_ENV_IS_IN_EEPROM) /* Environment is in EEPROM */ + +#include <command.h> +#include <environment.h> +#include <cmd_nvedit.h> +#include <linux/stddef.h> +#include <malloc.h> + +env_t *env_ptr = NULL; + +char * env_name_spec = "EEPROM"; + +extern uchar (*env_get_char)(int); +extern uchar env_get_char_memory (int index); + + +uchar env_get_char_spec (int index) +{ + uchar c; + + eeprom_read (CFG_DEF_EEPROM_ADDR, + CFG_ENV_OFFSET+index+offsetof(env_t,data), + &c, 1); + + return (c); +} + +void env_relocate_spec (void) +{ + eeprom_read (CFG_DEF_EEPROM_ADDR, + CFG_ENV_OFFSET, + (uchar*)env_ptr, + CFG_ENV_SIZE); +} + +int saveenv(void) +{ + return eeprom_write (CFG_DEF_EEPROM_ADDR, + CFG_ENV_OFFSET, + (uchar *)env_ptr, + CFG_ENV_SIZE); +} + +/************************************************************************ + * Initialize Environment use + * + * We are still running from ROM, so data use is limited + * Use a (moderately small) buffer on the stack + */ +int env_init(void) +{ + DECLARE_GLOBAL_DATA_PTR; + + ulong crc, len, new; + unsigned off; + uchar buf[64]; + + eeprom_init (); /* prepare for EEPROM read/write */ + + /* read old CRC */ + eeprom_read (CFG_DEF_EEPROM_ADDR, + CFG_ENV_OFFSET+offsetof(env_t,crc), + (uchar *)&crc, sizeof(ulong)); + + new = 0; + len = ENV_SIZE; + off = offsetof(env_t,data); + while (len > 0) { + int n = (len > sizeof(buf)) ? sizeof(buf) : len; + + eeprom_read (CFG_DEF_EEPROM_ADDR, CFG_ENV_OFFSET+off, buf, n); + new = crc32 (new, buf, n); + len -= n; + off += n; + } + + if (crc == new) { + gd->env_addr = offsetof(env_t,data); + gd->env_valid = 1; + } else { + gd->env_addr = 0; + gd->env_valid = 0; + } + + return (0); +} + +#endif /* CFG_ENV_IS_IN_EEPROM */ diff --git a/common/env_nowhere.c b/common/env_nowhere.c new file mode 100644 index 0000000000..b274c03557 --- /dev/null +++ b/common/env_nowhere.c @@ -0,0 +1,68 @@ +/* + * (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 + */ + +#include <common.h> + +#if defined(CFG_ENV_IS_NOWHERE) /* Environment is nowhere */ + +#include <command.h> +#include <environment.h> +#include <linux/stddef.h> +#include <malloc.h> + +env_t *env_ptr = NULL; + +extern uchar default_environment[]; +extern int default_environment_size; + + +void env_relocate_spec (void) +{ +} + +uchar env_get_char_spec (int index) +{ + DECLARE_GLOBAL_DATA_PTR; + + return ( *((uchar *)(gd->env_addr + index)) ); +} + +/************************************************************************ + * Initialize Environment use + * + * We are still running from ROM, so data use is limited + */ +int env_init(void) +{ + DECLARE_GLOBAL_DATA_PTR; + + gd->env_addr = (ulong)&default_environment[0]; + gd->env_valid = 0; + + return (0); +} + +#endif /* CFG_ENV_IS_NOWHERE) */ |