2 * Copyright © 2007 Eugene Konev <ejka@openwrt.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
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.
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 * TI AR7 flash partition table.
19 * Based on ar7 map by Felix Fietkau <nbd@openwrt.org>
23 #include <linux/kernel.h>
24 #include <linux/slab.h>
26 #include <linux/mtd/mtd.h>
27 #include <linux/mtd/partitions.h>
28 #include <linux/bootmem.h>
29 #include <linux/magic.h>
32 #define ROOT_OFFSET 0xe0000
34 #define LOADER_MAGIC1 le32_to_cpu(0xfeedfa42)
35 #define LOADER_MAGIC2 le32_to_cpu(0xfeed1281)
38 unsigned int checksum;
43 static struct mtd_partition ar7_parts[AR7_PARTS];
45 static int create_mtd_partitions(struct mtd_info *master,
46 struct mtd_partition **pparts,
49 struct ar7_bin_rec header;
50 unsigned int offset, len;
51 unsigned int pre_size = master->erasesize, post_size = 0;
52 unsigned int root_offset = ROOT_OFFSET;
56 ar7_parts[0].name = "loader";
57 ar7_parts[0].offset = 0;
58 ar7_parts[0].size = master->erasesize;
59 ar7_parts[0].mask_flags = MTD_WRITEABLE;
61 ar7_parts[1].name = "config";
62 ar7_parts[1].offset = 0;
63 ar7_parts[1].size = master->erasesize;
64 ar7_parts[1].mask_flags = 0;
66 do { /* Try 10 blocks starting from master->erasesize */
68 master->read(master, offset,
69 sizeof(header), &len, (u8 *)&header);
70 if (!strncmp((char *)&header, "TIENV0.8", 8))
71 ar7_parts[1].offset = pre_size;
72 if (header.checksum == LOADER_MAGIC1)
74 if (header.checksum == LOADER_MAGIC2)
76 pre_size += master->erasesize;
81 if (!ar7_parts[1].offset) {
82 ar7_parts[1].offset = master->size - master->erasesize;
83 post_size = master->erasesize;
86 switch (header.checksum) {
88 while (header.length) {
89 offset += sizeof(header) + header.length;
90 master->read(master, offset, sizeof(header),
93 root_offset = offset + sizeof(header) + 4;
96 while (header.length) {
97 offset += sizeof(header) + header.length;
98 master->read(master, offset, sizeof(header),
101 root_offset = offset + sizeof(header) + 4 + 0xff;
102 root_offset &= ~(u32)0xff;
105 printk(KERN_WARNING "Unknown magic: %08x\n", header.checksum);
109 master->read(master, root_offset,
110 sizeof(header), &len, (u8 *)&header);
111 if (header.checksum != SQUASHFS_MAGIC) {
112 root_offset += master->erasesize - 1;
113 root_offset &= ~(master->erasesize - 1);
116 ar7_parts[2].name = "linux";
117 ar7_parts[2].offset = pre_size;
118 ar7_parts[2].size = master->size - pre_size - post_size;
119 ar7_parts[2].mask_flags = 0;
121 ar7_parts[3].name = "rootfs";
122 ar7_parts[3].offset = root_offset;
123 ar7_parts[3].size = master->size - root_offset - post_size;
124 ar7_parts[3].mask_flags = 0;
130 static struct mtd_part_parser ar7_parser = {
131 .owner = THIS_MODULE,
132 .parse_fn = create_mtd_partitions,
136 static int __init ar7_parser_init(void)
138 return register_mtd_parser(&ar7_parser);
141 module_init(ar7_parser_init);
143 MODULE_LICENSE("GPL");
144 MODULE_AUTHOR( "Felix Fietkau <nbd@openwrt.org>, "
145 "Eugene Konev <ejka@openwrt.org>");
146 MODULE_DESCRIPTION("MTD partitioning for TI AR7");