mirror of
https://github.com/AsahiLinux/u-boot
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170 lines
4.1 KiB
C
170 lines
4.1 KiB
C
/*
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* (C) Copyright 2004
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* Jian Zhang, Texas Instruments, jzhang@ti.com.
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* (C) Copyright 2000-2004
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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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/* #define DEBUG */
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#include <common.h>
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#if defined(CFG_ENV_IS_IN_NAND) /* Environment is in Nand Flash */
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#include <command.h>
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#include <environment.h>
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#include <linux/stddef.h>
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#include <linux/mtd/nand.h>
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#if ((CONFIG_COMMANDS&(CFG_CMD_ENV|CFG_CMD_NAND)) == (CFG_CMD_ENV|CFG_CMD_NAND))
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#define CMD_SAVEENV
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#endif
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#if defined(CFG_ENV_SIZE_REDUND)
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#error CFG_ENV_SIZE_REDUND not supported yet
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#endif
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#if defined(CFG_ENV_ADDR_REDUND)
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#error CFG_ENV_ADDR_REDUND and CFG_ENV_IS_IN_NAND not supported yet
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#endif
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#ifdef CONFIG_INFERNO
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#error CONFIG_INFERNO not supported yet
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#endif
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/* references to names in cmd_nand.c */
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#define NANDRW_READ 0x01
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#define NANDRW_WRITE 0x00
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#define NANDRW_JFFS2 0x02
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extern struct nand_chip nand_dev_desc[];
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int nand_rw (struct nand_chip* nand, int cmd,
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size_t start, size_t len,
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size_t * retlen, u_char * buf);
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int nand_erase(struct nand_chip* nand, size_t ofs,
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size_t len, int clean);
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/* references to names in env_common.c */
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extern uchar default_environment[];
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extern int default_environment_size;
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char * env_name_spec = "NAND";
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#ifdef ENV_IS_EMBEDDED
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extern uchar environment[];
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env_t *env_ptr = (env_t *)(&environment[0]);
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#else /* ! ENV_IS_EMBEDDED */
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env_t *env_ptr = 0;
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#endif /* ENV_IS_EMBEDDED */
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/* local functions */
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static void use_default(void);
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uchar env_get_char_spec (int index)
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{
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DECLARE_GLOBAL_DATA_PTR;
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return ( *((uchar *)(gd->env_addr + index)) );
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}
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/* this is called before nand_init()
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* so we can't read Nand to validate env data.
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* Mark it OK for now. env_relocate() in env_common.c
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* will call our relocate function which will does
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* the real validation.
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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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gd->env_addr = (ulong)&default_environment[0];
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gd->env_valid = 1;
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return (0);
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}
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#ifdef CMD_SAVEENV
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int saveenv(void)
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{
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int total, ret = 0;
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puts ("Erasing Nand...");
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if (nand_erase(nand_dev_desc + 0, CFG_ENV_OFFSET, CFG_ENV_SIZE, 0))
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return 1;
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puts ("Writing to Nand... ");
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ret = nand_rw(nand_dev_desc + 0,
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NANDRW_WRITE | NANDRW_JFFS2, CFG_ENV_OFFSET, CFG_ENV_SIZE,
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&total, (u_char*)env_ptr);
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if (ret || total != CFG_ENV_SIZE)
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return 1;
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puts ("done\n");
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return ret;
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}
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#endif /* CMD_SAVEENV */
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void env_relocate_spec (void)
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{
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#if !defined(ENV_IS_EMBEDDED)
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int ret, total;
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ret = nand_rw(nand_dev_desc + 0,
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NANDRW_READ | NANDRW_JFFS2, CFG_ENV_OFFSET, CFG_ENV_SIZE,
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&total, (u_char*)env_ptr);
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if (ret || total != CFG_ENV_SIZE)
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return use_default();
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if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
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return use_default();
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#endif /* ! ENV_IS_EMBEDDED */
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}
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static void use_default()
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{
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DECLARE_GLOBAL_DATA_PTR;
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puts ("*** Warning - bad CRC or NAND, using default environment\n\n");
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if (default_environment_size > CFG_ENV_SIZE){
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puts ("*** Error - default environment is too large\n\n");
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return;
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}
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memset (env_ptr, 0, sizeof(env_t));
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memcpy (env_ptr->data,
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default_environment,
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default_environment_size);
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env_ptr->crc = crc32(0, env_ptr->data, ENV_SIZE);
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gd->env_valid = 1;
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}
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#endif /* CFG_ENV_IS_IN_NAND */
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