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
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
|
/*
* Infineon/ADMTek ADM8668 (WildPass) partition parser support
*
* Copyright (C) 2010 Scott Nicholas <neutronscott@scottn.us>
* Copyright (C) 2012 Florian Fainelli <florian@openwrt.org>
*
* original functions for finding root filesystem from Mike Baker
*
* 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* 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.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*
* Copyright 2004, Broadcom Corporation
* All Rights Reserved.
*
* THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
* KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
* SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/crc32.h>
#include <linux/magic.h>
#define PFX "adm8668-part: "
/* first a little bit about the headers i need.. */
/* just interested in part of the full struct */
struct squashfs_super_block {
__le32 s_magic;
__le32 pad0[9]; /* it's not really padding */
__le64 bytes_used;
};
#define IH_MAGIC 0x56190527 /* Image Magic Number */
struct uboot_header {
uint32_t ih_magic; /* Image Header Magic Number */
uint32_t ih_hcrc; /* Image Header CRC Checksum */
uint32_t ih_time; /* Image Creation Timestamp */
uint32_t ih_size; /* Image Data Size */
uint32_t ih_load; /* Data Load Address */
uint32_t ih_ep; /* Entry Point Address */
uint32_t ih_dcrc; /* Image Data CRC Checksum */
uint8_t ih_os; /* Operating System */
uint8_t ih_arch; /* CPU architecture */
uint8_t ih_type; /* Image Type */
uint8_t ih_comp; /* Compression Type */
char ih_name[32]; /* image name */
};
/* in case i wanna change stuff later, and to clarify the math section... */
#define PART_LINUX 0
#define PART_ROOTFS 1
#define PART_UBOOT_ENV 2
#define NR_PARTS 3
static int adm8668_parse_partitions(struct mtd_info *master,
struct mtd_partition **pparts,
struct mtd_part_parser_data *data)
{
int ret;
struct uboot_header uhdr;
int off, blocksize;
size_t len, linux_len;
struct squashfs_super_block shdr;
struct erase_info erase_info;
struct mtd_partition *adm8668_parts;
memset(&erase_info, 0, sizeof(erase_info));
blocksize = master->erasesize;
if (blocksize < 0x10000)
blocksize = 0x10000;
adm8668_parts = kzalloc(sizeof(*adm8668_parts) * NR_PARTS, GFP_KERNEL);
if (!adm8668_parts)
return -ENOMEM;
adm8668_parts[PART_LINUX].name = kstrdup("linux", GFP_KERNEL);
adm8668_parts[PART_LINUX].offset = 0x40000;
adm8668_parts[PART_LINUX].size = master->size - 0x40000;
adm8668_parts[PART_ROOTFS].name = kstrdup("rootfs", GFP_KERNEL);
adm8668_parts[PART_ROOTFS].offset = 0xe0000;
adm8668_parts[PART_ROOTFS].size = 0x140000;
adm8668_parts[PART_UBOOT_ENV].name = kstrdup("uboot_env", GFP_KERNEL);
adm8668_parts[PART_UBOOT_ENV].offset = 0x20000;
adm8668_parts[PART_UBOOT_ENV].size = 0x20000;
/* now find squashfs */
memset(&shdr, 0xe5, sizeof(shdr));
for (off = 0x40000; off < master->size; off += blocksize) {
/*
* Read into buffer
*/
if (mtd_read(master, off, sizeof(shdr), &len, (char *)&shdr) ||
len != sizeof(shdr))
continue;
if (shdr.s_magic == SQUASHFS_MAGIC) {
uint32_t fs_size = (uint32_t)shdr.bytes_used;
pr_info(PFX "filesystem type: squashfs, size=%dkB\n",
fs_size >> 10);
/*
* Update rootfs based on the superblock info, and
* stretch to end of MTD. rootfs_split will split it
*/
adm8668_parts[PART_ROOTFS].offset = off;
adm8668_parts[PART_ROOTFS].size = master->size -
adm8668_parts[PART_ROOTFS].offset;
/*
* kernel ends where rootfs starts
* but we'll keep it full-length for upgrades
*/
linux_len = adm8668_parts[PART_LINUX + 1].offset -
adm8668_parts[PART_LINUX].offset;
adm8668_parts[PART_LINUX].size = master->size -
adm8668_parts[PART_LINUX].offset;
goto found;
}
}
pr_err(PFX "could't find root filesystem\n");
return NR_PARTS;
found:
if (mtd_read(master, adm8668_parts[PART_LINUX].offset, sizeof(uhdr), &len, (char *)&uhdr) ||
len != sizeof(uhdr)) {
pr_err(PFX "failed to read u-boot header\n");
return NR_PARTS;
}
if (uhdr.ih_magic != IH_MAGIC) {
pr_info(PFX "invalid u-boot magic detected?!?!\n");
return NR_PARTS;
}
if (be32_to_cpu(uhdr.ih_size) != (linux_len - sizeof(uhdr))) {
u32 data;
size_t data_len = 0;
unsigned char *block;
unsigned int offset;
offset = adm8668_parts[PART_LINUX].offset +
sizeof(struct uboot_header);
pr_info(PFX "Updating U-boot image:\n");
pr_info(PFX " old: [size: %8d crc32: 0x%08x]\n",
be32_to_cpu(uhdr.ih_size), be32_to_cpu(uhdr.ih_dcrc));
if (mtd_read(master, offset, sizeof(data), &data_len, (char *)&data)) {
pr_err(PFX "failed to read data\n");
goto out;
}
/* Update the data length & crc32 */
uhdr.ih_size = cpu_to_be32(linux_len - sizeof(uhdr));
uhdr.ih_dcrc = crc32_le(~0, (char *)&data, linux_len - sizeof(uhdr)) ^ (~0);
uhdr.ih_dcrc = cpu_to_be32(uhdr.ih_dcrc);
pr_info(PFX " new: [size: %8d crc32: 0x%08x]\n",
be32_to_cpu(uhdr.ih_size), be32_to_cpu(uhdr.ih_dcrc));
/* update header's crc... */
uhdr.ih_hcrc = 0;
uhdr.ih_hcrc = crc32_le(~0, (unsigned char *)&uhdr,
sizeof(uhdr)) ^ (~0);
uhdr.ih_hcrc = cpu_to_be32(uhdr.ih_hcrc);
/* read first eraseblock from the image */
block = vmalloc(master->erasesize);
if (!block)
return -ENOMEM;
if (mtd_read(master, adm8668_parts[PART_LINUX].offset, master->erasesize, &len, block)
|| len != master->erasesize) {
pr_err(PFX "error copying first eraseblock\n");
return 0;
}
/* Write updated header to the flash */
memcpy(block, &uhdr, sizeof(uhdr));
if (master->unlock)
master->unlock(master, off, master->erasesize);
erase_info.mtd = master;
erase_info.addr = (uint64_t)adm8668_parts[PART_LINUX].offset;
erase_info.len = master->erasesize;
ret = mtd_erase(master, &erase_info);
if (!ret) {
if (mtd_write(master, adm8668_parts[PART_LINUX].offset, master->erasesize,
&len, block))
pr_err(PFX "write failed");
} else
pr_err(PFX "erase failed");
mtd_sync(master);
out:
if (block)
vfree(block);
pr_info(PFX "done\n");
}
*pparts = adm8668_parts;
return NR_PARTS;
}
static struct mtd_part_parser adm8668_parser = {
.owner = THIS_MODULE,
.parse_fn = adm8668_parse_partitions,
.name = "adm8668part",
};
static int __init adm8668_parser_init(void)
{
return register_mtd_parser(&adm8668_parser);
}
static void __exit adm8668_parser_exit(void)
{
deregister_mtd_parser(&adm8668_parser);
}
module_init(adm8668_parser_init);
module_exit(adm8668_parser_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Scott Nicholas <neutronscott@scottn.us>");
MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
MODULE_DESCRIPTION("MTD partition parser for ADM8668");
|
