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c9f7351b5b
This is a re-submission of the patch by Harald Welte
<laforge@openmoko.org> with minor modifications for rebase and changes
as suggested by Scott Wood <scottwood@freescale.com> [1] [2].
This patch enables the environment partition to have a run-time dynamic
location (offset) in the NAND flash. The reason for this is simply that
all NAND flashes have factory-default bad blocks, and a fixed compile
time offset would mean that sometimes the environment partition would
live inside factory bad blocks. Since the number of factory default
blocks can be quite high (easily 1.3MBytes in current standard
components), it is not economic to keep that many spare blocks inside
the environment partition.
With this patch and CONFIG_ENV_OFFSET_OOB enabled, the location of the
environment partition is stored in the out-of-band (OOB) data of the
first block in flash. Since the first block is where most systems boot
from, the vendors guarantee that the first block is not a factory
default block.
This patch introduces the 'nand env.oob' command, which can be called
from the u-boot command line. 'nand env.oob get' reads the address of
the environment partition from the OOB data, 'nand env.oob set
{offset,partition-name}' allows the setting of the marker by specifying
a numeric offset or a partition name.
[1] http://article.gmane.org/gmane.comp.boot-loaders.u-boot/43916
[2] http://article.gmane.org/gmane.comp.boot-loaders.u-boot/79195
Signed-off-by: Ben Gardiner <bengardiner@nanometrics.ca>
Acked-by: Harald Welte <laforge@gnumonks.org>
141 lines
4.3 KiB
C
141 lines
4.3 KiB
C
/*
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* (C) Copyright 2005
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* 2N Telekomunikace, a.s. <www.2n.cz>
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* Ladislav Michl <michl@2n.cz>
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*
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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
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* version 2 as published by the Free Software Foundation.
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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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#ifndef _NAND_H_
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#define _NAND_H_
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extern void nand_init(void);
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#include <linux/mtd/compat.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/nand.h>
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extern int board_nand_init(struct nand_chip *nand);
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typedef struct mtd_info nand_info_t;
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extern int nand_curr_device;
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extern nand_info_t nand_info[];
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static inline int nand_read(nand_info_t *info, loff_t ofs, size_t *len, u_char *buf)
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{
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return info->read(info, ofs, *len, (size_t *)len, buf);
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}
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static inline int nand_write(nand_info_t *info, loff_t ofs, size_t *len, u_char *buf)
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{
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return info->write(info, ofs, *len, (size_t *)len, buf);
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}
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static inline int nand_block_isbad(nand_info_t *info, loff_t ofs)
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{
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return info->block_isbad(info, ofs);
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}
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static inline int nand_erase(nand_info_t *info, loff_t off, size_t size)
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{
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struct erase_info instr;
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instr.mtd = info;
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instr.addr = off;
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instr.len = size;
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instr.callback = 0;
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return info->erase(info, &instr);
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}
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/*****************************************************************************
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* declarations from nand_util.c
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****************************************************************************/
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struct nand_write_options {
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u_char *buffer; /* memory block containing image to write */
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ulong length; /* number of bytes to write */
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ulong offset; /* start address in NAND */
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int quiet; /* don't display progress messages */
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int autoplace; /* if true use auto oob layout */
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int forcejffs2; /* force jffs2 oob layout */
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int forceyaffs; /* force yaffs oob layout */
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int noecc; /* write without ecc */
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int writeoob; /* image contains oob data */
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int pad; /* pad to page size */
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int blockalign; /* 1|2|4 set multiple of eraseblocks
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* to align to */
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};
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typedef struct nand_write_options nand_write_options_t;
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typedef struct mtd_oob_ops mtd_oob_ops_t;
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struct nand_read_options {
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u_char *buffer; /* memory block in which read image is written*/
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ulong length; /* number of bytes to read */
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ulong offset; /* start address in NAND */
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int quiet; /* don't display progress messages */
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int readoob; /* put oob data in image */
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};
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typedef struct nand_read_options nand_read_options_t;
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struct nand_erase_options {
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ulong length; /* number of bytes to erase */
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ulong offset; /* first address in NAND to erase */
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int quiet; /* don't display progress messages */
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int jffs2; /* if true: format for jffs2 usage
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* (write appropriate cleanmarker blocks) */
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int scrub; /* if true, really clean NAND by erasing
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* bad blocks (UNSAFE) */
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};
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typedef struct nand_erase_options nand_erase_options_t;
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int nand_read_skip_bad(nand_info_t *nand, loff_t offset, size_t *length,
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u_char *buffer);
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int nand_write_skip_bad(nand_info_t *nand, loff_t offset, size_t *length,
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u_char *buffer);
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int nand_erase_opts(nand_info_t *meminfo, const nand_erase_options_t *opts);
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#define NAND_LOCK_STATUS_TIGHT 0x01
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#define NAND_LOCK_STATUS_LOCK 0x02
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#define NAND_LOCK_STATUS_UNLOCK 0x04
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int nand_lock( nand_info_t *meminfo, int tight );
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int nand_unlock( nand_info_t *meminfo, ulong start, ulong length );
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int nand_get_lock_status(nand_info_t *meminfo, loff_t offset);
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#ifdef CONFIG_SYS_NAND_SELECT_DEVICE
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void board_nand_select_device(struct nand_chip *nand, int chip);
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#endif
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__attribute__((noreturn)) void nand_boot(void);
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#endif
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#ifdef CONFIG_ENV_OFFSET_OOB
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#define ENV_OOB_MARKER 0x30425645 /*"EVB0" in little-endian -- offset is stored
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as block number*/
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#define ENV_OOB_MARKER_OLD 0x30564e45 /*"ENV0" in little-endian -- offset is
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stored as byte number */
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#define ENV_OFFSET_SIZE 8
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int get_nand_env_oob(nand_info_t *nand, unsigned long *result);
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#endif
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