mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
129 lines
3.3 KiB
129 lines
3.3 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* Copyright © 2007 Eugene Konev <[email protected]> |
|
* |
|
* TI AR7 flash partition table. |
|
* Based on ar7 map by Felix Fietkau <[email protected]> |
|
*/ |
|
|
|
#include <linux/kernel.h> |
|
#include <linux/slab.h> |
|
|
|
#include <linux/mtd/mtd.h> |
|
#include <linux/mtd/partitions.h> |
|
#include <linux/memblock.h> |
|
#include <linux/module.h> |
|
|
|
#include <uapi/linux/magic.h> |
|
|
|
#define AR7_PARTS 4 |
|
#define ROOT_OFFSET 0xe0000 |
|
|
|
#define LOADER_MAGIC1 le32_to_cpu(0xfeedfa42) |
|
#define LOADER_MAGIC2 le32_to_cpu(0xfeed1281) |
|
|
|
struct ar7_bin_rec { |
|
unsigned int checksum; |
|
unsigned int length; |
|
unsigned int address; |
|
}; |
|
|
|
static int create_mtd_partitions(struct mtd_info *master, |
|
const struct mtd_partition **pparts, |
|
struct mtd_part_parser_data *data) |
|
{ |
|
struct ar7_bin_rec header; |
|
unsigned int offset; |
|
size_t len; |
|
unsigned int pre_size = master->erasesize, post_size = 0; |
|
unsigned int root_offset = ROOT_OFFSET; |
|
|
|
int retries = 10; |
|
struct mtd_partition *ar7_parts; |
|
|
|
ar7_parts = kcalloc(AR7_PARTS, sizeof(*ar7_parts), GFP_KERNEL); |
|
if (!ar7_parts) |
|
return -ENOMEM; |
|
ar7_parts[0].name = "loader"; |
|
ar7_parts[0].offset = 0; |
|
ar7_parts[0].size = master->erasesize; |
|
ar7_parts[0].mask_flags = MTD_WRITEABLE; |
|
|
|
ar7_parts[1].name = "config"; |
|
ar7_parts[1].offset = 0; |
|
ar7_parts[1].size = master->erasesize; |
|
ar7_parts[1].mask_flags = 0; |
|
|
|
do { /* Try 10 blocks starting from master->erasesize */ |
|
offset = pre_size; |
|
mtd_read(master, offset, sizeof(header), &len, |
|
(uint8_t *)&header); |
|
if (!strncmp((char *)&header, "TIENV0.8", 8)) |
|
ar7_parts[1].offset = pre_size; |
|
if (header.checksum == LOADER_MAGIC1) |
|
break; |
|
if (header.checksum == LOADER_MAGIC2) |
|
break; |
|
pre_size += master->erasesize; |
|
} while (retries--); |
|
|
|
pre_size = offset; |
|
|
|
if (!ar7_parts[1].offset) { |
|
ar7_parts[1].offset = master->size - master->erasesize; |
|
post_size = master->erasesize; |
|
} |
|
|
|
switch (header.checksum) { |
|
case LOADER_MAGIC1: |
|
while (header.length) { |
|
offset += sizeof(header) + header.length; |
|
mtd_read(master, offset, sizeof(header), &len, |
|
(uint8_t *)&header); |
|
} |
|
root_offset = offset + sizeof(header) + 4; |
|
break; |
|
case LOADER_MAGIC2: |
|
while (header.length) { |
|
offset += sizeof(header) + header.length; |
|
mtd_read(master, offset, sizeof(header), &len, |
|
(uint8_t *)&header); |
|
} |
|
root_offset = offset + sizeof(header) + 4 + 0xff; |
|
root_offset &= ~(uint32_t)0xff; |
|
break; |
|
default: |
|
printk(KERN_WARNING "Unknown magic: %08x\n", header.checksum); |
|
break; |
|
} |
|
|
|
mtd_read(master, root_offset, sizeof(header), &len, (u8 *)&header); |
|
if (header.checksum != SQUASHFS_MAGIC) { |
|
root_offset += master->erasesize - 1; |
|
root_offset &= ~(master->erasesize - 1); |
|
} |
|
|
|
ar7_parts[2].name = "linux"; |
|
ar7_parts[2].offset = pre_size; |
|
ar7_parts[2].size = master->size - pre_size - post_size; |
|
ar7_parts[2].mask_flags = 0; |
|
|
|
ar7_parts[3].name = "rootfs"; |
|
ar7_parts[3].offset = root_offset; |
|
ar7_parts[3].size = master->size - root_offset - post_size; |
|
ar7_parts[3].mask_flags = 0; |
|
|
|
*pparts = ar7_parts; |
|
return AR7_PARTS; |
|
} |
|
|
|
static struct mtd_part_parser ar7_parser = { |
|
.parse_fn = create_mtd_partitions, |
|
.name = "ar7part", |
|
}; |
|
module_mtd_part_parser(ar7_parser); |
|
|
|
MODULE_LICENSE("GPL"); |
|
MODULE_AUTHOR( "Felix Fietkau <[email protected]>, " |
|
"Eugene Konev <[email protected]>"); |
|
MODULE_DESCRIPTION("MTD partitioning for TI AR7");
|
|
|