source: SVN/rincon/u-boot/common/env_dataflash.c @ 55

Last change on this file since 55 was 55, checked in by Tim Harvey, 22 months ago

rincon: added latest u-boot source

restored form server backup

Signed-off-by: Tim Harvey <tharvey@…>

File size: 2.7 KB
Line 
1/* LowLevel function for DataFlash environment support
2 * Author : Gilles Gastaldi (Atmel)
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of
7 * the License, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
17 * MA 02111-1307 USA
18 *
19 */
20#include <common.h>
21#include <command.h>
22#include <environment.h>
23#include <linux/stddef.h>
24#include <dataflash.h>
25
26DECLARE_GLOBAL_DATA_PTR;
27
28env_t *env_ptr = NULL;
29
30char * env_name_spec = "dataflash";
31
32extern int read_dataflash (unsigned long addr, unsigned long size, char
33*result);
34extern int write_dataflash (unsigned long addr_dest, unsigned long addr_src,
35                     unsigned long size);
36extern int AT91F_DataflashInit (void);
37extern uchar default_environment[];
38/* extern int default_environment_size; */
39
40
41uchar env_get_char_spec (int index)
42{
43        uchar c;
44        read_dataflash(CONFIG_ENV_ADDR + index + offsetof(env_t,data),
45        1, (char *)&c);
46        return (c);
47}
48
49void env_relocate_spec (void)
50{
51        read_dataflash(CONFIG_ENV_ADDR, CONFIG_ENV_SIZE, (char *)env_ptr);
52}
53
54int saveenv(void)
55{
56        /* env must be copied to do not alter env structure in memory*/
57        unsigned char temp[CONFIG_ENV_SIZE];
58        memcpy(temp, env_ptr, CONFIG_ENV_SIZE);
59        return write_dataflash(CONFIG_ENV_ADDR, (unsigned long)temp, CONFIG_ENV_SIZE);
60}
61
62/************************************************************************
63 * Initialize Environment use
64 *
65 * We are still running from ROM, so data use is limited
66 * Use a (moderately small) buffer on the stack
67 */
68int env_init(void)
69{
70        ulong crc, len, new;
71        unsigned off;
72        uchar buf[64];
73        if (gd->env_valid == 0){
74                AT91F_DataflashInit();  /* prepare for DATAFLASH read/write */
75
76                /* read old CRC */
77                read_dataflash(CONFIG_ENV_ADDR + offsetof(env_t, crc),
78                        sizeof(ulong), (char *)&crc);
79                new = 0;
80                len = ENV_SIZE;
81                off = offsetof(env_t,data);
82                while (len > 0) {
83                        int n = (len > sizeof(buf)) ? sizeof(buf) : len;
84                        read_dataflash(CONFIG_ENV_ADDR + off, n, (char *)buf);
85                        new = crc32 (new, buf, n);
86                        len -= n;
87                        off += n;
88                }
89                if (crc == new) {
90                        gd->env_addr  = offsetof(env_t,data);
91                        gd->env_valid = 1;
92                } else {
93                        gd->env_addr  = (ulong)&default_environment[0];
94                        gd->env_valid = 0;
95                }
96        }
97
98        return (0);
99}
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