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Diffstat (limited to 'drivers/mtd/redboot.c')
-rw-r--r--drivers/mtd/redboot.c132
1 files changed, 95 insertions, 37 deletions
diff --git a/drivers/mtd/redboot.c b/drivers/mtd/redboot.c
index 8815c8dbef2..5da911ebdf4 100644
--- a/drivers/mtd/redboot.c
+++ b/drivers/mtd/redboot.c
@@ -1,8 +1,24 @@
/*
- * $Id: redboot.c,v 1.19 2005/12/01 10:03:51 dwmw2 Exp $
- *
* Parse RedBoot-style Flash Image System (FIS) tables and
* produce a Linux partition array to match.
+ *
+ * Copyright © 2001 Red Hat UK Limited
+ * Copyright © 2001-2010 David Woodhouse <dwmw2@infradead.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
+ *
*/
#include <linux/kernel.h>
@@ -12,17 +28,18 @@
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
+#include <linux/module.h>
struct fis_image_desc {
unsigned char name[16]; // Null terminated name
- unsigned long flash_base; // Address within FLASH of image
- unsigned long mem_base; // Address in memory where it executes
- unsigned long size; // Length of image
- unsigned long entry_point; // Execution entry point
- unsigned long data_length; // Length of actual data
- unsigned char _pad[256-(16+7*sizeof(unsigned long))];
- unsigned long desc_cksum; // Checksum over image descriptor
- unsigned long file_cksum; // Checksum over image data
+ uint32_t flash_base; // Address within FLASH of image
+ uint32_t mem_base; // Address in memory where it executes
+ uint32_t size; // Length of image
+ uint32_t entry_point; // Execution entry point
+ uint32_t data_length; // Length of actual data
+ unsigned char _pad[256-(16+7*sizeof(uint32_t))];
+ uint32_t desc_cksum; // Checksum over image descriptor
+ uint32_t file_cksum; // Checksum over image data
};
struct fis_list {
@@ -40,8 +57,8 @@ static inline int redboot_checksum(struct fis_image_desc *img)
}
static int parse_redboot_partitions(struct mtd_info *master,
- struct mtd_partition **pparts,
- unsigned long fis_origin)
+ struct mtd_partition **pparts,
+ struct mtd_part_parser_data *data)
{
int nrparts = 0;
struct fis_image_desc *buf;
@@ -59,21 +76,34 @@ static int parse_redboot_partitions(struct mtd_info *master,
static char nullstring[] = "unallocated";
#endif
+ if ( directory < 0 ) {
+ offset = master->size + directory * master->erasesize;
+ while (mtd_block_isbad(master, offset)) {
+ if (!offset) {
+ nogood:
+ printk(KERN_NOTICE "Failed to find a non-bad block to check for RedBoot partition table\n");
+ return -EIO;
+ }
+ offset -= master->erasesize;
+ }
+ } else {
+ offset = directory * master->erasesize;
+ while (mtd_block_isbad(master, offset)) {
+ offset += master->erasesize;
+ if (offset == master->size)
+ goto nogood;
+ }
+ }
buf = vmalloc(master->erasesize);
if (!buf)
return -ENOMEM;
- if ( directory < 0 )
- offset = master->size + directory*master->erasesize;
- else
- offset = directory*master->erasesize;
-
printk(KERN_NOTICE "Searching for RedBoot partition table in %s at offset 0x%lx\n",
master->name, offset);
- ret = master->read(master, offset,
- master->erasesize, &retlen, (void *)buf);
+ ret = mtd_read(master, offset, master->erasesize, &retlen,
+ (void *)buf);
if (ret)
goto out;
@@ -85,10 +115,6 @@ static int parse_redboot_partitions(struct mtd_info *master,
numslots = (master->erasesize / sizeof(struct fis_image_desc));
for (i = 0; i < numslots; i++) {
- if (buf[i].name[0] == 0xff) {
- i = numslots;
- break;
- }
if (!memcmp(buf[i].name, "FIS directory", 14)) {
/* This is apparently the FIS directory entry for the
* FIS directory itself. The FIS directory size is
@@ -98,9 +124,32 @@ static int parse_redboot_partitions(struct mtd_info *master,
* (NOTE: this is 'size' not 'data_length'; size is
* the full size of the entry.)
*/
- if (swab32(buf[i].size) == master->erasesize) {
+
+ /* RedBoot can combine the FIS directory and
+ config partitions into a single eraseblock;
+ we assume wrong-endian if either the swapped
+ 'size' matches the eraseblock size precisely,
+ or if the swapped size actually fits in an
+ eraseblock while the unswapped size doesn't. */
+ if (swab32(buf[i].size) == master->erasesize ||
+ (buf[i].size > master->erasesize
+ && swab32(buf[i].size) < master->erasesize)) {
int j;
- for (j = 0; j < numslots && buf[j].name[0] != 0xff; ++j) {
+ /* Update numslots based on actual FIS directory size */
+ numslots = swab32(buf[i].size) / sizeof (struct fis_image_desc);
+ for (j = 0; j < numslots; ++j) {
+
+ /* A single 0xff denotes a deleted entry.
+ * Two of them in a row is the end of the table.
+ */
+ if (buf[j].name[0] == 0xff) {
+ if (buf[j].name[1] == 0xff) {
+ break;
+ } else {
+ continue;
+ }
+ }
+
/* The unsigned long fields were written with the
* wrong byte sex, name and pad have no byte sex.
*/
@@ -112,6 +161,9 @@ static int parse_redboot_partitions(struct mtd_info *master,
swab32s(&buf[j].desc_cksum);
swab32s(&buf[j].file_cksum);
}
+ } else if (buf[i].size < master->erasesize) {
+ /* Update numslots based on actual FIS directory size */
+ numslots = buf[i].size / sizeof(struct fis_image_desc);
}
break;
}
@@ -127,8 +179,13 @@ static int parse_redboot_partitions(struct mtd_info *master,
for (i = 0; i < numslots; i++) {
struct fis_list *new_fl, **prev;
- if (buf[i].name[0] == 0xff)
- break;
+ if (buf[i].name[0] == 0xff) {
+ if (buf[i].name[1] == 0xff) {
+ break;
+ } else {
+ continue;
+ }
+ }
if (!redboot_checksum(&buf[i]))
break;
@@ -139,11 +196,10 @@ static int parse_redboot_partitions(struct mtd_info *master,
goto out;
}
new_fl->img = &buf[i];
- if (fis_origin) {
- buf[i].flash_base -= fis_origin;
- } else {
- buf[i].flash_base &= master->size-1;
- }
+ if (data && data->origin)
+ buf[i].flash_base -= data->origin;
+ else
+ buf[i].flash_base &= master->size-1;
/* I'm sure the JFFS2 code has done me permanent damage.
* I now think the following is _normal_
@@ -169,15 +225,13 @@ static int parse_redboot_partitions(struct mtd_info *master,
}
}
#endif
- parts = kmalloc(sizeof(*parts)*nrparts + nulllen + namelen, GFP_KERNEL);
+ parts = kzalloc(sizeof(*parts)*nrparts + nulllen + namelen, GFP_KERNEL);
if (!parts) {
ret = -ENOMEM;
goto out;
}
- memset(parts, 0, sizeof(*parts)*nrparts + nulllen + namelen);
-
nullname = (char *)&parts[nrparts];
#ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED
if (nulllen > 0) {
@@ -241,9 +295,13 @@ static struct mtd_part_parser redboot_parser = {
.name = "RedBoot",
};
+/* mtd parsers will request the module by parser name */
+MODULE_ALIAS("RedBoot");
+
static int __init redboot_parser_init(void)
{
- return register_mtd_parser(&redboot_parser);
+ register_mtd_parser(&redboot_parser);
+ return 0;
}
static void __exit redboot_parser_exit(void)
@@ -255,5 +313,5 @@ module_init(redboot_parser_init);
module_exit(redboot_parser_exit);
MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Red Hat, Inc. - David Woodhouse <dwmw2@cambridge.redhat.com>");
+MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
MODULE_DESCRIPTION("Parsing code for RedBoot Flash Image System (FIS) tables");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-06 11:57:25 +0000