1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
/*
* $Id$
*
* Copyright (C) 2007 OpenWrt.org
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* TI AR7 flash partition table.
* Based on ar7 map by Felix Fietkau.
*
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/bootmem.h>
#include <linux/squashfs_fs.h>
struct ar7_bin_rec {
unsigned int checksum;
unsigned int length;
unsigned int address;
};
static struct mtd_partition ar7_parts[5];
static int create_mtd_partitions(struct mtd_info *master,
struct mtd_partition **pparts,
unsigned long origin)
{
char sig[8];
struct ar7_bin_rec header;
unsigned int offset, new_offset, len;
struct squashfs_super_block sb;
unsigned int block_size = 0x10000, pre_size = 0x10000,
post_size = 0, root_offset = 0xe0000;
unsigned int p = 3;
printk("Parsing AR7 partition map...\n");
ar7_parts[0].name = "loader";
ar7_parts[0].offset = 0;
ar7_parts[0].size = block_size;
ar7_parts[0].mask_flags = MTD_WRITEABLE;
ar7_parts[1].name = "config";
ar7_parts[1].size = block_size;
ar7_parts[1].mask_flags = 0;
master->read(master, block_size, 8, &len, sig);
if (strncmp(sig, "TIENV0.8", 8)) {
ar7_parts[1].offset = master->size - block_size;
post_size = block_size;
} else {
ar7_parts[1].offset = block_size;
pre_size = block_size * 2;
}
ar7_parts[2].name = "linux";
ar7_parts[2].offset = pre_size;
ar7_parts[2].size = master->size - block_size * 2;
ar7_parts[2].mask_flags = 0;
offset = pre_size;
master->read(master, offset, sizeof(header), &len, (u_char *)&header);
if (header.checksum != 0xfeedfa42) {
printk("Unknown magic: %08x\n", header.checksum);
} else {
while (header.length) {
offset += sizeof(header) + header.length;
master->read(master, offset, sizeof(header),
&len, (u_char *)&header);
}
root_offset = offset + sizeof(header) + 4;
}
ar7_parts[p].name = "rootfs";
ar7_parts[p].offset = root_offset;
ar7_parts[p].size = master->size - root_offset - post_size;
ar7_parts[p++].mask_flags = 0;
master->read(master, root_offset, sizeof(sb), &len, (u_char *)&sb);
if (sb.s_magic == SQUASHFS_MAGIC) {
printk("Squashfs detected (size %Ld)\n", sb.bytes_used);
new_offset = root_offset + sb.bytes_used;
if ((new_offset % master->erasesize) > 0)
new_offset += master->erasesize -
(new_offset % master->erasesize);
ar7_parts[p].name = "rootfs_data";
ar7_parts[p].offset = new_offset;
ar7_parts[p].size = master->size - new_offset - post_size;
ar7_parts[p - 1].size -= ar7_parts[p].size;
ar7_parts[p - 1].mask_flags |= MTD_WRITEABLE;
ar7_parts[p++].mask_flags = 0;
} else {
printk("Squashfs not found. Moving rootfs partition to next erase block\n");
if ((root_offset % master->erasesize) > 0)
root_offset += master->erasesize -
(root_offset % master->erasesize);
ar7_parts[p].offset = root_offset;
ar7_parts[p].size = master->size - root_offset - post_size;
}
*pparts = ar7_parts;
return p;
}
static struct mtd_part_parser ar7_parser = {
.owner = THIS_MODULE,
.parse_fn = create_mtd_partitions,
.name = "ar7part",
};
static int __init ar7_parser_init(void)
{
return register_mtd_parser(&ar7_parser);
}
module_init(ar7_parser_init);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Felix Fietkau, Eugene Konev");
MODULE_DESCRIPTION("MTD partitioning for TI AR7");
|
