From: Felix Fietkau <[email protected]>
mtd: block2mtd: Ensure that block2mtd is presented in a timely fashion
Currently, a block MTD device is not presented to the system on time, in
order to start mounting the filesystems. This patch ensures that block2mtd
is presented at the right time, so filesystems can be mounted on boot time.
This issue was seen on BCM2835 (Raspberry Pi) systems when mounting JFFS2
block2mtd filesystems.
This patchset also adds a MTD device name and a timeout option to the driver.
Original patchset:
https://dev.openwrt.org/browser/trunk/target/linux/generic/patches-3.12/440-block2mtd_init.patch?rev=40444
https://dev.openwrt.org/browser/trunk/target/linux/generic/patches-3.12/441-block2mtd_probe.patch?rev=40444
Signed-off-by: Felix Fietkau <[email protected]>
Signed-off-by: Rodrigo Freire <[email protected]>
Signed-off-by: Herton Krzesinski <[email protected]>
---
V2: Uses kstrdup, removed PAGE_MASK.
--- a/drivers/mtd/devices/block2mtd.c 2014-09-16 21:38:12.543952627 -0300
+++ b/drivers/mtd/devices/block2mtd.c 2014-09-17 17:43:21.424944394 -0300
@@ -9,7 +9,15 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+/*
+* When the first attempt at device initialization fails, we may need to
+* wait a little bit and retry. This timeout, by default 3 seconds, gives
+* device time to start up. Required on BCM2708 and a few other chipsets.
+*/
+#define MTD_DEFAULT_TIMEOUT 3
+
#include <linux/module.h>
+#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/blkdev.h>
#include <linux/bio.h>
@@ -17,6 +25,7 @@
#include <linux/list.h>
#include <linux/init.h>
#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
#include <linux/mutex.h>
#include <linux/mount.h>
#include <linux/slab.h>
@@ -209,12 +218,14 @@ static void block2mtd_free_device(struct
}
-static struct block2mtd_dev *add_device(char *devname, int erase_size)
+static struct block2mtd_dev *add_device(char *devname, int erase_size, const char *mtdname, int timeout)
{
const fmode_t mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
- struct block_device *bdev;
+ struct block_device *bdev = ERR_PTR(-ENODEV);
struct block2mtd_dev *dev;
+ struct mtd_partition *part;
char *name;
+ int i;
if (!devname)
return NULL;
@@ -225,15 +236,28 @@ static struct block2mtd_dev *add_device(
/* Get a handle on the device */
bdev = blkdev_get_by_path(devname, mode, dev);
-#ifndef MODULE
- if (IS_ERR(bdev)) {
- /* We might not have rootfs mounted at this point. Try
- to resolve the device name by other means. */
-
- dev_t devt = name_to_dev_t(devname);
- if (devt)
- bdev = blkdev_get_by_dev(devt, mode, dev);
+#ifndef MODULE
+/*
+* We might not have the root device mounted at this point.
+* Try to resolve the device name by other means.
+*/
+ for (i = 0; IS_ERR(bdev) && i <= timeout; i++) {
+ dev_t devt;
+
+ if (i)
+ /*
+ * Calling wait_for_device_probe in the first loop
+ * was not enough, sleep for a bit in subsequent
+ * go-arounds.
+ */
+ msleep(1000);
+ wait_for_device_probe();
+
+ devt = name_to_dev_t(devname);
+ if (!devt)
+ continue;
+ bdev = blkdev_get_by_dev(devt, mode, dev);
}
#endif
@@ -257,13 +281,14 @@ static struct block2mtd_dev *add_device(
/* Setup the MTD structure */
/* make the name contain the block device in */
- name = kasprintf(GFP_KERNEL, "block2mtd: %s", devname);
+ if (!mtdname)
+ mtdname = devname;
+ name = kstrdup (mtdname, GFP_KERNEL);
if (!name)
goto err_destroy_mutex;
dev->mtd.name = name;
-
- dev->mtd.size = dev->blkdev->bd_inode->i_size & PAGE_MASK;
+ dev->mtd.size = dev->blkdev->bd_inode->i_size & ~(erase_size - 1);
dev->mtd.erasesize = erase_size;
dev->mtd.writesize = 1;
dev->mtd.writebufsize = PAGE_SIZE;
@@ -276,15 +301,19 @@ static struct block2mtd_dev *add_device(
dev->mtd.priv = dev;
dev->mtd.owner = THIS_MODULE;
- if (mtd_device_register(&dev->mtd, NULL, 0)) {
+ part = kzalloc(sizeof(struct mtd_partition), GFP_KERNEL);
+ part->name = name;
+ part->offset = 0;
+ part->size = dev->mtd.size;
+ if (mtd_device_register(&dev->mtd, part, 1)) {
/* Device didn't get added, so free the entry */
goto err_destroy_mutex;
}
+
list_add(&dev->list, &blkmtd_device_list);
pr_info("mtd%d: [%s] erase_size = %dKiB [%d]\n",
dev->mtd.index,
- dev->mtd.name + strlen("block2mtd: "),
- dev->mtd.erasesize >> 10, dev->mtd.erasesize);
+ mtdname, dev->mtd.erasesize >> 10, dev->mtd.erasesize);
return dev;
err_destroy_mutex:
@@ -353,11 +382,12 @@ static char block2mtd_paramline[80 + 12]
static int block2mtd_setup2(const char *val)
{
- char buf[80 + 12]; /* 80 for device, 12 for erase size */
+ char buf[80 + 12 + 80 + 8]; /* 80 for device, 12 for erase size, 80 for name, 8 for timeout */
char *str = buf;
- char *token[2];
+ char *token[4];
char *name;
size_t erase_size = PAGE_SIZE;
+ unsigned long timeout = MTD_DEFAULT_TIMEOUT;
int i, ret;
if (strnlen(val, sizeof(buf)) >= sizeof(buf)) {
@@ -368,7 +398,7 @@ static int block2mtd_setup2(const char *
strcpy(str, val);
kill_final_newline(str);
- for (i = 0; i < 2; i++)
+ for (i = 0; i < 4; i++)
token[i] = strsep(&str, ",");
if (str) {
@@ -395,7 +425,13 @@ static int block2mtd_setup2(const char *
}
}
- add_device(name, erase_size);
+ if (token[2] && (strlen(token[2]) + 1 > 80))
+ pr_err("mtd device name too long");
+
+
+ if (token[3] && kstrtoul(token[3], 0, &timeout))
+ pr_err("invalid timeout");
+ add_device(name, erase_size, token[2], timeout);
return 0;
}
@@ -429,7 +465,7 @@ static int block2mtd_setup(const char *v
module_param_call(block2mtd, block2mtd_setup, NULL, NULL, 0200);
-MODULE_PARM_DESC(block2mtd, "Device to use. \"block2mtd=<dev>[,<erasesize>]\"");
+MODULE_PARM_DESC(block2mtd, "Device to use. \"block2mtd=<dev>[,<erasesize>[,<name>[,<timeout>]]]\"");
static int __init block2mtd_init(void)
{
@@ -463,8 +499,7 @@ static void block2mtd_exit(void)
}
}
-
-module_init(block2mtd_init);
+late_initcall(block2mtd_init);
module_exit(block2mtd_exit);
MODULE_LICENSE("GPL");
---
1.7.1
From: Felix Fietkau <[email protected]>
mtd: block2mtd: Ensure that block2mtd is presented timely on boot time
Currently, a block MTD device is not presented to the system on time, in
order to start mounting the filesystems. This patch ensures that block2mtd
is presented at the right time, so filesystems can be mounted on boot time.
This issue is seen on BCM2835 (Raspberry Pi) systems when mounting JFFS2
over block2mtd devices as the root filesystem.
This patchset also adds a MTD device name and a timeout option to the driver.
Original patchset:
https://dev.openwrt.org/browser/trunk/target/linux/generic/patches-3.12/440-block2mtd_init.patch?rev=40444
https://dev.openwrt.org/browser/trunk/target/linux/generic/patches-3.12/441-block2mtd_probe.patch?rev=40444
Signed-off-by: Felix Fietkau <[email protected]>
Signed-off-by: Herton Ronaldo Krzesinski <[email protected]>
Signed-off-by: Rodrigo Freire <[email protected]>
---
V2: Uses kstrdup, removed PAGE_MASK.
--- a/drivers/mtd/devices/block2mtd.c 2014-09-16 21:38:12.543952627 -0300
+++ b/drivers/mtd/devices/block2mtd.c 2014-09-17 17:43:21.424944394 -0300
@@ -9,7 +9,15 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+/*
+* When the first attempt at device initialization fails, we may need to
+* wait a little bit and retry. This timeout, by default 3 seconds, gives
+* device time to start up. Required on BCM2835.
+*/
+#define MTD_DEFAULT_TIMEOUT 3
+
#include <linux/module.h>
+#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/blkdev.h>
#include <linux/bio.h>
@@ -17,6 +25,7 @@
#include <linux/list.h>
#include <linux/init.h>
#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
#include <linux/mutex.h>
#include <linux/mount.h>
#include <linux/slab.h>
@@ -209,12 +218,14 @@ static void block2mtd_free_device(struct
}
-static struct block2mtd_dev *add_device(char *devname, int erase_size)
+static struct block2mtd_dev *add_device(char *devname, int erase_size, const char *mtdname, int timeout)
{
const fmode_t mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
- struct block_device *bdev;
+ struct block_device *bdev = ERR_PTR(-ENODEV);
struct block2mtd_dev *dev;
+ struct mtd_partition *part;
char *name;
+ int i;
if (!devname)
return NULL;
@@ -225,15 +236,28 @@ static struct block2mtd_dev *add_device(
/* Get a handle on the device */
bdev = blkdev_get_by_path(devname, mode, dev);
-#ifndef MODULE
- if (IS_ERR(bdev)) {
- /* We might not have rootfs mounted at this point. Try
- to resolve the device name by other means. */
-
- dev_t devt = name_to_dev_t(devname);
- if (devt)
- bdev = blkdev_get_by_dev(devt, mode, dev);
+#ifndef MODULE
+/*
+* We might not have the root device mounted at this point.
+* Try to resolve the device name by other means.
+*/
+ for (i = 0; IS_ERR(bdev) && i <= timeout; i++) {
+ dev_t devt;
+
+ if (i)
+ /*
+ * Calling wait_for_device_probe in the first loop
+ * was not enough, sleep for a bit in subsequent
+ * go-arounds.
+ */
+ msleep(1000);
+ wait_for_device_probe();
+
+ devt = name_to_dev_t(devname);
+ if (!devt)
+ continue;
+ bdev = blkdev_get_by_dev(devt, mode, dev);
}
#endif
@@ -257,13 +281,14 @@ static struct block2mtd_dev *add_device(
/* Setup the MTD structure */
/* make the name contain the block device in */
- name = kasprintf(GFP_KERNEL, "block2mtd: %s", devname);
+ if (!mtdname)
+ mtdname = devname;
+ name = kstrdup (mtdname, GFP_KERNEL);
if (!name)
goto err_destroy_mutex;
dev->mtd.name = name;
-
- dev->mtd.size = dev->blkdev->bd_inode->i_size & PAGE_MASK;
+ dev->mtd.size = dev->blkdev->bd_inode->i_size & ~(erase_size - 1);
dev->mtd.erasesize = erase_size;
dev->mtd.writesize = 1;
dev->mtd.writebufsize = PAGE_SIZE;
@@ -276,15 +301,19 @@ static struct block2mtd_dev *add_device(
dev->mtd.priv = dev;
dev->mtd.owner = THIS_MODULE;
- if (mtd_device_register(&dev->mtd, NULL, 0)) {
+ part = kzalloc(sizeof(struct mtd_partition), GFP_KERNEL);
+ part->name = name;
+ part->offset = 0;
+ part->size = dev->mtd.size;
+ if (mtd_device_register(&dev->mtd, part, 1)) {
/* Device didn't get added, so free the entry */
goto err_destroy_mutex;
}
+
list_add(&dev->list, &blkmtd_device_list);
pr_info("mtd%d: [%s] erase_size = %dKiB [%d]\n",
dev->mtd.index,
- dev->mtd.name + strlen("block2mtd: "),
- dev->mtd.erasesize >> 10, dev->mtd.erasesize);
+ mtdname, dev->mtd.erasesize >> 10, dev->mtd.erasesize);
return dev;
err_destroy_mutex:
@@ -353,11 +382,12 @@ static char block2mtd_paramline[80 + 12]
static int block2mtd_setup2(const char *val)
{
- char buf[80 + 12]; /* 80 for device, 12 for erase size */
+ char buf[80 + 12 + 80 + 8]; /* 80 for device, 12 for erase size, 80 for name, 8 for timeout */
char *str = buf;
- char *token[2];
+ char *token[4];
char *name;
size_t erase_size = PAGE_SIZE;
+ unsigned long timeout = MTD_DEFAULT_TIMEOUT;
int i, ret;
if (strnlen(val, sizeof(buf)) >= sizeof(buf)) {
@@ -368,7 +398,7 @@ static int block2mtd_setup2(const char *
strcpy(str, val);
kill_final_newline(str);
- for (i = 0; i < 2; i++)
+ for (i = 0; i < 4; i++)
token[i] = strsep(&str, ",");
if (str) {
@@ -395,7 +425,13 @@ static int block2mtd_setup2(const char *
}
}
- add_device(name, erase_size);
+ if (token[2] && (strlen(token[2]) + 1 > 80))
+ pr_err("mtd device name too long");
+
+
+ if (token[3] && kstrtoul(token[3], 0, &timeout))
+ pr_err("invalid timeout");
+ add_device(name, erase_size, token[2], timeout);
return 0;
}
@@ -429,7 +465,7 @@ static int block2mtd_setup(const char *v
module_param_call(block2mtd, block2mtd_setup, NULL, NULL, 0200);
-MODULE_PARM_DESC(block2mtd, "Device to use. \"block2mtd=<dev>[,<erasesize>]\"");
+MODULE_PARM_DESC(block2mtd, "Device to use. \"block2mtd=<dev>[,<erasesize>[,<name>[,<timeout>]]]\"");
static int __init block2mtd_init(void)
{
@@ -463,8 +499,7 @@ static void block2mtd_exit(void)
}
}
-
-module_init(block2mtd_init);
+late_initcall(block2mtd_init);
module_exit(block2mtd_exit);
MODULE_LICENSE("GPL");
---
1.7.1
On Thu, Oct 09, 2014 at 11:07:31AM -0400, Rodrigo Freire wrote:
> From: Felix Fietkau <[email protected]>
>
> mtd: block2mtd: Ensure that block2mtd is presented in a timely fashion
>
> Currently, a block MTD device is not presented to the system on time, in
> order to start mounting the filesystems. This patch ensures that block2mtd
> is presented at the right time, so filesystems can be mounted on boot time.
> This issue was seen on BCM2835 (Raspberry Pi) systems when mounting JFFS2
> block2mtd filesystems.
> This patchset also adds a MTD device name and a timeout option to the driver.
> Original patchset:
> https://dev.openwrt.org/browser/trunk/target/linux/generic/patches-3.12/440-block2mtd_init.patch?rev=40444
> https://dev.openwrt.org/browser/trunk/target/linux/generic/patches-3.12/441-block2mtd_probe.patch?rev=40444
>
> Signed-off-by: Felix Fietkau <[email protected]>
> Signed-off-by: Rodrigo Freire <[email protected]>
> Signed-off-by: Herton Krzesinski <[email protected]>
> ---
> V2: Uses kstrdup, removed PAGE_MASK.
FYI, this copy was malformed. All the indentation and formatting is
wrong, so it doesn't apply. I'll look at the previous copy you sent, but
please fix this in the future.
Brian
> --- a/drivers/mtd/devices/block2mtd.c 2014-09-16 21:38:12.543952627 -0300
> +++ b/drivers/mtd/devices/block2mtd.c 2014-09-17 17:43:21.424944394 -0300
> @@ -9,7 +9,15 @@
>
> #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>
> +/*
> +* When the first attempt at device initialization fails, we may need to
> +* wait a little bit and retry. This timeout, by default 3 seconds, gives
> +* device time to start up. Required on BCM2708 and a few other chipsets.
> +*/
> +#define MTD_DEFAULT_TIMEOUT 3
> +
> #include <linux/module.h>
> +#include <linux/delay.h>
> #include <linux/fs.h>
> #include <linux/blkdev.h>
> #include <linux/bio.h>
> @@ -17,6 +25,7 @@
> #include <linux/list.h>
> #include <linux/init.h>
> #include <linux/mtd/mtd.h>
> +#include <linux/mtd/partitions.h>
> #include <linux/mutex.h>
> #include <linux/mount.h>
> #include <linux/slab.h>
> @@ -209,12 +218,14 @@ static void block2mtd_free_device(struct
> }
>
>
> -static struct block2mtd_dev *add_device(char *devname, int erase_size)
> +static struct block2mtd_dev *add_device(char *devname, int erase_size, const char *mtdname, int timeout)
> {
> const fmode_t mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
> - struct block_device *bdev;
> + struct block_device *bdev = ERR_PTR(-ENODEV);
> struct block2mtd_dev *dev;
> + struct mtd_partition *part;
> char *name;
> + int i;
>
> if (!devname)
> return NULL;
> @@ -225,15 +236,28 @@ static struct block2mtd_dev *add_device(
>
> /* Get a handle on the device */
> bdev = blkdev_get_by_path(devname, mode, dev);
> -#ifndef MODULE
> - if (IS_ERR(bdev)) {
>
> - /* We might not have rootfs mounted at this point. Try
> - to resolve the device name by other means. */
> -
> - dev_t devt = name_to_dev_t(devname);
> - if (devt)
> - bdev = blkdev_get_by_dev(devt, mode, dev);
> +#ifndef MODULE
> +/*
> +* We might not have the root device mounted at this point.
> +* Try to resolve the device name by other means.
> +*/
> + for (i = 0; IS_ERR(bdev) && i <= timeout; i++) {
> + dev_t devt;
> +
> + if (i)
> + /*
> + * Calling wait_for_device_probe in the first loop
> + * was not enough, sleep for a bit in subsequent
> + * go-arounds.
> + */
> + msleep(1000);
> + wait_for_device_probe();
> +
> + devt = name_to_dev_t(devname);
> + if (!devt)
> + continue;
> + bdev = blkdev_get_by_dev(devt, mode, dev);
> }
> #endif
>
> @@ -257,13 +281,14 @@ static struct block2mtd_dev *add_device(
>
> /* Setup the MTD structure */
> /* make the name contain the block device in */
> - name = kasprintf(GFP_KERNEL, "block2mtd: %s", devname);
> + if (!mtdname)
> + mtdname = devname;
> + name = kstrdup (mtdname, GFP_KERNEL);
> if (!name)
> goto err_destroy_mutex;
>
> dev->mtd.name = name;
> -
> - dev->mtd.size = dev->blkdev->bd_inode->i_size & PAGE_MASK;
> + dev->mtd.size = dev->blkdev->bd_inode->i_size & ~(erase_size - 1);
> dev->mtd.erasesize = erase_size;
> dev->mtd.writesize = 1;
> dev->mtd.writebufsize = PAGE_SIZE;
> @@ -276,15 +301,19 @@ static struct block2mtd_dev *add_device(
> dev->mtd.priv = dev;
> dev->mtd.owner = THIS_MODULE;
>
> - if (mtd_device_register(&dev->mtd, NULL, 0)) {
> + part = kzalloc(sizeof(struct mtd_partition), GFP_KERNEL);
> + part->name = name;
> + part->offset = 0;
> + part->size = dev->mtd.size;
> + if (mtd_device_register(&dev->mtd, part, 1)) {
> /* Device didn't get added, so free the entry */
> goto err_destroy_mutex;
> }
> +
> list_add(&dev->list, &blkmtd_device_list);
> pr_info("mtd%d: [%s] erase_size = %dKiB [%d]\n",
> dev->mtd.index,
> - dev->mtd.name + strlen("block2mtd: "),
> - dev->mtd.erasesize >> 10, dev->mtd.erasesize);
> + mtdname, dev->mtd.erasesize >> 10, dev->mtd.erasesize);
> return dev;
>
> err_destroy_mutex:
> @@ -353,11 +382,12 @@ static char block2mtd_paramline[80 + 12]
>
> static int block2mtd_setup2(const char *val)
> {
> - char buf[80 + 12]; /* 80 for device, 12 for erase size */
> + char buf[80 + 12 + 80 + 8]; /* 80 for device, 12 for erase size, 80 for name, 8 for timeout */
> char *str = buf;
> - char *token[2];
> + char *token[4];
> char *name;
> size_t erase_size = PAGE_SIZE;
> + unsigned long timeout = MTD_DEFAULT_TIMEOUT;
> int i, ret;
>
> if (strnlen(val, sizeof(buf)) >= sizeof(buf)) {
> @@ -368,7 +398,7 @@ static int block2mtd_setup2(const char *
> strcpy(str, val);
> kill_final_newline(str);
>
> - for (i = 0; i < 2; i++)
> + for (i = 0; i < 4; i++)
> token[i] = strsep(&str, ",");
>
> if (str) {
> @@ -395,7 +425,13 @@ static int block2mtd_setup2(const char *
> }
> }
>
> - add_device(name, erase_size);
> + if (token[2] && (strlen(token[2]) + 1 > 80))
> + pr_err("mtd device name too long");
> +
> +
> + if (token[3] && kstrtoul(token[3], 0, &timeout))
> + pr_err("invalid timeout");
> + add_device(name, erase_size, token[2], timeout);
>
> return 0;
> }
> @@ -429,7 +465,7 @@ static int block2mtd_setup(const char *v
>
>
> module_param_call(block2mtd, block2mtd_setup, NULL, NULL, 0200);
> -MODULE_PARM_DESC(block2mtd, "Device to use. \"block2mtd=<dev>[,<erasesize>]\"");
> +MODULE_PARM_DESC(block2mtd, "Device to use. \"block2mtd=<dev>[,<erasesize>[,<name>[,<timeout>]]]\"");
>
> static int __init block2mtd_init(void)
> {
> @@ -463,8 +499,7 @@ static void block2mtd_exit(void)
> }
> }
>
> -
> -module_init(block2mtd_init);
> +late_initcall(block2mtd_init);
> module_exit(block2mtd_exit);
>
> MODULE_LICENSE("GPL");
> ---
> 1.7.1
>
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/
On Sat, 2014-11-01 at 09:33 -0400, Rodrigo Freire wrote:
> From: Felix Fietkau <[email protected]>
>
> mtd: block2mtd: Ensure that block2mtd is presented timely on boot time
>
> Currently, a block MTD device is not presented to the system on time, in
> order to start mounting the filesystems. This patch ensures that block2mtd
> is presented at the right time, so filesystems can be mounted on boot time.
> This issue is seen on BCM2835 (Raspberry Pi) systems when mounting JFFS2
> over block2mtd devices as the root filesystem.
> This patchset also adds a MTD device name and a timeout option to the driver.
> Original patchset:
> https://dev.openwrt.org/browser/trunk/target/linux/generic/patches-3.12/440-block2mtd_init.patch?rev=40444
> https://dev.openwrt.org/browser/trunk/target/linux/generic/patches-3.12/441-block2mtd_probe.patch?rev=40444
I think you can mount jffs2 using /dev/mtdX, you do not need the block
driver.
On Fri, Nov 07, 2014 at 11:44:40AM +0200, Artem Bityutskiy wrote:
> On Sat, 2014-11-01 at 09:33 -0400, Rodrigo Freire wrote:
> > From: Felix Fietkau <[email protected]>
> >
> > mtd: block2mtd: Ensure that block2mtd is presented timely on boot time
> >
> > Currently, a block MTD device is not presented to the system on time, in
> > order to start mounting the filesystems. This patch ensures that block2mtd
> > is presented at the right time, so filesystems can be mounted on boot time.
> > This issue is seen on BCM2835 (Raspberry Pi) systems when mounting JFFS2
> > over block2mtd devices as the root filesystem.
> > This patchset also adds a MTD device name and a timeout option to the driver.
> > Original patchset:
> > https://dev.openwrt.org/browser/trunk/target/linux/generic/patches-3.12/440-block2mtd_init.patch?rev=40444
> > https://dev.openwrt.org/browser/trunk/target/linux/generic/patches-3.12/441-block2mtd_probe.patch?rev=40444
>
> I think you can mount jffs2 using /dev/mtdX, you do not need the block
> driver.
I realize you acknowledged your misunderstanding here, but for
posterity -- this point is addressed in the FAQ:
http://www.linux-mtd.infradead.org/faq/jffs2.html#L_mtdblock
Last I checked, the statement about busybox is still true. I think the
rootfs comment may be stale; I think the rootfstype= parameter can help
you.
Brian