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139 lines
3.7 KiB
C
139 lines
3.7 KiB
C
/*
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* (C) Copyright 2000-2002
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Andreas Heppel <aheppel@sysgo.de>
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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/*
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* 09-18-2001 Andreas Heppel, Sysgo RTS GmbH <aheppel@sysgo.de>
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*
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* It might not be possible in all cases to use 'memcpy()' to copy
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* the environment to NVRAM, as the NVRAM might not be mapped into
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* the memory space. (I.e. this is the case for the BAB750). In those
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* cases it might be possible to access the NVRAM using a different
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* method. For example, the RTC on the BAB750 is accessible in IO
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* space using its address and data registers. To enable usage of
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* NVRAM in those cases I invented the functions 'nvram_read()' and
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* 'nvram_write()', which will be activated upon the configuration
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* #define CFG_NVRAM_ACCESS_ROUTINE. Note, that those functions are
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* strongly dependent on the used HW, and must be redefined for each
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* board that wants to use them.
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*/
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#include <common.h>
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#ifdef CFG_ENV_IS_IN_NVRAM /* Environment is in NVRAM */
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#include <command.h>
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#include <environment.h>
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#include <cmd_nvedit.h>
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#include <linux/stddef.h>
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#include <malloc.h>
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#ifdef CFG_NVRAM_ACCESS_ROUTINE
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extern void *nvram_read(void *dest, const long src, size_t count);
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extern void nvram_write(long dest, const void *src, size_t count);
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env_t *env_ptr = NULL;
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#else
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env_t *env_ptr = (env_t *)CFG_ENV_ADDR;
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#endif
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char * env_name_spec = "NVRAM";
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extern uchar default_environment[];
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extern int default_environment_size;
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extern uchar (*env_get_char)(int);
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extern uchar env_get_char_memory (int index);
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uchar env_get_char_spec (int index)
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{
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#ifdef CFG_NVRAM_ACCESS_ROUTINE
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uchar c;
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nvram_read(&c, CFG_ENV_ADDR+index, 1);
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return c;
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#else
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DECLARE_GLOBAL_DATA_PTR;
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return *((uchar *)(gd->env_addr + index));
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#endif
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}
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void env_relocate_spec (void)
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{
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#if defined(CFG_NVRAM_ACCESS_ROUTINE)
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nvram_read(env_ptr, CFG_ENV_ADDR, CFG_ENV_SIZE);
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#else
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memcpy (env_ptr, (void*)CFG_ENV_ADDR, CFG_ENV_SIZE);
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#endif
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}
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int saveenv (void)
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{
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int rcode = 0;
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#ifdef CFG_NVRAM_ACCESS_ROUTINE
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nvram_write(CFG_ENV_ADDR, env_ptr, CFG_ENV_SIZE);
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#else
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if (memcpy ((char *)CFG_ENV_ADDR, env_ptr, CFG_ENV_SIZE) == NULL)
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rcode = 1 ;
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#endif
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return rcode;
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}
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/************************************************************************
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* Initialize Environment use
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*
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* We are still running from ROM, so data use is limited
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*/
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int env_init (void)
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{
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DECLARE_GLOBAL_DATA_PTR;
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#if defined(CFG_NVRAM_ACCESS_ROUTINE)
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ulong crc;
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uchar data[ENV_SIZE];
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nvram_read (&crc, CFG_ENV_ADDR, sizeof(ulong));
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nvram_read (data, CFG_ENV_ADDR+sizeof(ulong), ENV_SIZE);
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if (crc32(0, data, ENV_SIZE) == crc) {
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gd->env_addr = (ulong)CFG_ENV_ADDR + sizeof(long);
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#else
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if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
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gd->env_addr = (ulong)&(env_ptr->data);
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#endif
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gd->env_valid = 1;
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} else {
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gd->env_addr = (ulong)&default_environment[0];
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gd->env_valid = 0;
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}
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return (0);
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}
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#endif /* CFG_ENV_IS_IN_NVRAM */
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