[FS#3272] jffs2 will erase on every reboot the rootfs_data partition

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Polynomdivision (PolynomialDivision) 

Attached to Project - OpenWrt/LEDE Project
Summary - jffs2 will erase on every reboot the rootfs_data partition
Task Type - Bug Report
Category - Kernel
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - I wanted to add support fpr the Nanobeam AC Gen2. https://github.com/openwrt/openwrt/pull/3266

Everything works with trunk compiled with 4.19. Switching to 5.4 seems to not correctly unlock the flash. OpenWrt finds "End of filesystem marker found at 0x0" after a reboot and erases the flash again.

**First Boot**

Kernel command line: console=ttyS0,115200 rootfstype=squashfs,jffs2
jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
mount_root: jffs2 not ready yet, using temporary tmpfs overlay
jffs2_scan_eraseblock(): End of filesystem marker found at 0x0
jffs2_build_filesystem(): unlocking the mtd device...
jffs2_build_filesystem(): erasing all blocks after the end marker...
jffs2: Newly-erased block contained word 0x0 at offset 0x00420000
jffs2: Newly-erased block contained word 0xdeadc0de at offset 0x00410000
jffs2: Newly-erased block contained word 0xdeadc0de at offset 0x003f0000
jffs2: Newly-erased block contained word 0xb3aedd63 at offset 0x003e0000
jffs2: Newly-erased block contained word 0xd31704ef at offset 0x003d0000
jffs2: Newly-erased block contained word 0x756c245f at offset 0x003c0000
jffs2: Newly-erased block contained word 0x672c1aa9 at offset 0x003b0000
jffs2: Newly-erased block contained word 0xb59345ff at offset 0x003a0000
jffs2: Newly-erased block contained word 0x45e1dc8b at offset 0x00390000
jffs2: Newly-erased block contained word 0x9e92aeea at offset 0x00380000
jffs2: Newly-erased block contained word 0xf9d35c83 at offset 0x00370000
jffs2: Newly-erased block contained word 0xc2075909 at offset 0x00360000
jffs2: Newly-erased block contained word 0x87facdde at offset 0x00350000
jffs2: Newly-erased block contained word 0x65c65c73 at offset 0x00340000
jffs2: notice: (1466) jffs2_build_xattr_subsystem: complete building xattr subsystem, 0 of xdatum (0 unchecked, 0 orphan) and 0 of xref (0 dead, 0 orphan) found.
mount_root: failed to sync jffs2 overlay

[[https://gist.githubusercontent.com/PolynomialDivision/1779cfd7126d9f5841063816b93d1324/raw/cd0e8d9fb1f955f9ee9ed8fd438ab2e307bad848/jffs2-firstboot|Full Log]]

**Reboot**
Kernel command line: console=ttyS0,115200 rootfstype=squashfs,jffs2
jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00340000: 0x65c6 instead
jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00360024: 0x02b5 instead
...
jffs2: Further such events for this erase block will not be printed
jffs2: Old JFFS2 bitmask found at 0x00369840
jffs2: You cannot use older JFFS2 filesystems with newer kernels
jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00370000: 0xf9d3 instead
...
jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00390024: 0x3669 instead
jffs2: Further such events for this erase block will not be printed
jffs2: Old JFFS2 bitmask found at 0x00395294
jffs2: You cannot use older JFFS2 filesystems with newer kernels
jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x003a0000: 0xb593 instead
...
jffs2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x003e0024: 0x79a9 instead
jffs2: Further such events for this erase block will not be printed
jffs2: Empty flash at 0x003e1e98 ends at 0x003e2000
jffs2: Empty flash at 0x003e2004 ends at 0x003e4000
jffs2_scan_eraseblock(): End of filesystem marker found at 0x3f0000
jffs2_build_filesystem(): unlocking the mtd device...
jffs2_build_filesystem(): erasing all blocks after the end marker...
jffs2: Newly-erased block contained word 0x0 at offset 0x00420000
jffs2: Newly-erased block contained word 0xdeadc0de at offset 0x00410000
jffs2: Newly-erased block contained word 0xdeadc0de at offset 0x003f0000
jffs2: Newly-erased block contained word 0xb3aedd63 at offset 0x003e0000
jffs2: Newly-erased block contained word 0xd31704ef at offset 0x003d0000
jffs2: Newly-erased block contained word 0x756c245f at offset 0x003c0000
jffs2: Newly-erased block contained word 0x672c1aa9 at offset 0x003b0000
jffs2: Newly-erased block contained word 0xb59345ff at offset 0x003a0000
jffs2: Newly-erased block contained word 0x45e1dc8b at offset 0x00390000
jffs2: Newly-erased block contained word 0x9e92aeea at offset 0x00380000
jffs2: Newly-erased block contained word 0xf9d35c83 at offset 0x00370000
jffs2: Newly-erased block contained word 0xc2075909 at offset 0x00360000
jffs2: Newly-erased block contained word 0x87facdde at offset 0x00350000
jffs2: Newly-erased block contained word 0x65c65c73 at offset 0x00340000
jffs2: notice: (500) jffs2_build_xattr_subsystem: complete building xattr subsystem, 0 of xdatum (0 unchecked, 0 orphan) and 0 of xref (0 dead, 0 orphan) found.
mount_root: switching to jffs2 overlay

[[https://gist.githubusercontent.com/PolynomialDivision/47fc64fe5a9739576bec6faefa6cf459/raw/03ecbb18c5992a4d2891e4368fef49b7bbd857b9/jffs2-reboot|Full Log]]

**Probably Related Issues**
- [[https://lists.openwrt.org/pipermail/openwrt-devel/2016-February/014119.html|Patch for disabling software protection]]
- [[https://elixir.bootlin.com/linux/v5.4.51/source/drivers/mtd/spi-nor/spi-nor.c|SPI Nor Driver]]
- [[https://dev.archive.openwrt.org/ticket/20982|jffs2-error / nanostation M5 xw / r47658]

**Some Infos**
- NOR
- Flash Chip Supports 4K erases in addition to 64K
- 

Layout AirOS 8.7

WA# cat /proc/mtd 
dev:    size   erasesize  name
mtd0: 00040000 00010000 "u-boot"
mtd1: 00010000 00010000 "u-boot-env"
mtd2: 00100000 00010000 "kernel"
mtd3: 00e60000 00010000 "rootfs"
mtd4: 00040000 00010000 "cfg"
mtd5: 00010000 00010000 "EEPROM"


**MTD 4.19**

dev:    size   erasesize  name
mtd0: 00040000 00010000 "u-boot"
mtd1: 00010000 00010000 "u-boot-env"
mtd2: 00f60000 00010000 "firmware"
mtd3: 001c0000 00010000 "kernel"
mtd4: 00da0000 00010000 "rootfs"
mtd5: 00b30000 00010000 "rootfs_data"
mtd6: 00040000 00010000 "cfg"
mtd7: 00010000 00010000 "art"


**MTD 5.4**
TODO

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3272

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