Allows erasing a whole NAND device including the bad blocks. Only meant
for development where one might accidently overwrite real bad block
information.
Signed-off-by: Wolfram Sang <w.sang@xxxxxxxxxxxxxx>
---
commands/Kconfig | 8 +++++
commands/flash.c | 68 ++++++++++++++++++++++++++++++++++++++++++-
drivers/mtd/core.c | 7 +++++
include/linux/mtd/mtd-abi.h | 1 +
4 files changed, 83 insertions(+), 1 deletion(-)
diff --git a/commands/Kconfig b/commands/Kconfig
index ac9b797..32ba35f 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -341,6 +341,14 @@ config CMD_FLASH
tristate
prompt "protect/erase"
+config CMD_SCRUB
+ tristate
+ depends on CMD_FLASH && EXPERIMENTAL
+ prompt "scrub"
+ help
+ DANGEROUS! Like erase, but will erase badblocks, too!
+ Only meant for development!
+
config CMD_UBI
tristate
default y if UBI
diff --git a/commands/flash.c b/commands/flash.c
index d22d6a0..7cdc86d 100644
--- a/commands/flash.c
+++ b/commands/flash.c
@@ -28,9 +28,13 @@
#include <command.h>
#include <errno.h>
#include <getopt.h>
+#include <malloc.h>
#include <fs.h>
#include <fcntl.h>
+#include <ioctl.h>
#include <linux/stat.h>
+#include <linux/mtd/mtd-abi.h>
+#include <linux/mtd/nand.h>
static int do_flerase(int argc, char *argv[])
{
@@ -38,11 +42,14 @@ static int do_flerase(int argc, char *argv[])
char *filename = NULL;
struct stat s;
loff_t start = 0, size = ~0;
- int ret = 0;
+ int ret = 0, do_scrub;
if (argc == 1)
return COMMAND_ERROR_USAGE;
+ /* was 'scrub' called? */
+ do_scrub = (*argv[0] == 's');
+
filename = argv[1];
if (stat(filename, &s)) {
@@ -64,10 +71,50 @@ static int do_flerase(int argc, char *argv[])
goto out;
}
+ if (do_scrub) {
+ ret = ioctl(fd, MEMIGNOREBAD, (void *)1);
+ if (ret) {
+ perror("activating scrub");
+ printf("Currently, scrub only works with whole NAND devices, not partitions.\n");
+ goto out;
+ }
+ }
+
if (erase(fd, size, start)) {
perror("erase");
ret = 1;
}
+
+ if (do_scrub) {
+ struct mtd_info_user user;
+ int tmp_ret;
+
+ /* Always clear 'MEMIGNOREBAD', even when erase failed! */
+ tmp_ret = ioctl(fd, MEMIGNOREBAD, (void *)0);
+ if (tmp_ret) {
+ perror("deactivating scrub");
+ ret = tmp_ret;
+ }
+
+ /* Bail out on erase error or ioctl error */
+ if (ret)
+ goto out;
+
+ /* After scrubbing, recreate BBTs */
+ ret = ioctl(fd, MEMGETINFO, &user);
+ if (ret) {
+ perror("ioctl");
+ goto out;
+ }
+
+ if (user.type == MTD_NANDFLASH) {
+ struct nand_chip *chip = user.mtd->priv;
+
+ kfree(chip->bbt);
+ chip->bbt = NULL;
+ ret = chip->scan_bbt(user.mtd);
+ }
+ }
out:
close(fd);
@@ -99,6 +146,25 @@ devinfo_command for partition handling.
*/
+#ifdef CONFIG_CMD_SCRUB
+
+BAREBOX_CMD_HELP_START(scrub)
+BAREBOX_CMD_HELP_USAGE("scrub <device>\n")
+BAREBOX_CMD_HELP_SHORT("Scrub a NAND device. DANGEROUS! Make sure you read all help text.\n")
+BAREBOX_CMD_HELP_TEXT("This is similar to erase but will erase badblocks, too!\n")
+BAREBOX_CMD_HELP_TEXT("That will also erase factory written badblock information, but might\n")
+BAREBOX_CMD_HELP_TEXT("restore blocks you accidently marked bad. USE ONLY WHEN YOU ARE SURE!\n")
+BAREBOX_CMD_HELP_TEXT("It will always scrub the whole device, areas are not supported (yet).\n")
+BAREBOX_CMD_HELP_END
+
+BAREBOX_CMD_START(scrub)
+ .cmd = do_flerase,
+ .usage = "scrub FLASH memory (DANGEROUS!)",
+ BAREBOX_CMD_HELP(cmd_scrub_help)
+BAREBOX_CMD_END
+
+#endif /* CONFIG_CMD_SCRUB */
+
static int do_protect(int argc, char *argv[])
{
int fd;
diff --git a/drivers/mtd/core.c b/drivers/mtd/core.c
index 95db1d6..b18447f 100644
--- a/drivers/mtd/core.c
+++ b/drivers/mtd/core.c
@@ -130,6 +130,7 @@ int mtd_ioctl(struct cdev *cdev, int request, void *buf)
{
int ret = 0;
struct mtd_info *mtd = cdev->priv;
+ struct nand_chip *chip = mtd->priv;
struct mtd_info_user *user = buf;
#if (defined(CONFIG_NAND_ECC_HW) || defined(CONFIG_NAND_ECC_SOFT))
struct mtd_ecc_stats *ecc = buf;
@@ -148,6 +149,12 @@ int mtd_ioctl(struct cdev *cdev, int request, void *buf)
ret = mtd->block_markbad(mtd, *offset);
break;
#endif
+ case MEMIGNOREBAD:
+ dev_dbg(cdev->dev, "MEMINGNOREBAD: %d\n", (bool)buf);
+ mtd->flags &= ~MTD_IGNORE_BB;
+ if ((bool)buf)
+ mtd->flags |= MTD_IGNORE_BB;
+ break;
case MEMGETINFO:
user->type = mtd->type;
user->flags = mtd->flags;
diff --git a/include/linux/mtd/mtd-abi.h b/include/linux/mtd/mtd-abi.h
index 49eb8e6..a1b2eb4 100644
--- a/include/linux/mtd/mtd-abi.h
+++ b/include/linux/mtd/mtd-abi.h
@@ -99,6 +99,7 @@ struct otp_info {
#define ECCGETLAYOUT _IOR('M', 17, struct nand_ecclayout)
#define ECCGETSTATS _IOR('M', 18, struct mtd_ecc_stats)
#define MTDFILEMODE _IO('M', 19)
+#define MEMIGNOREBAD _IOW('M', 64, int)
/*
* Obsolete legacy interface. Keep it in order not to break userspace
--
1.7.10.4
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