fs: jffs2: add initial support for reading jffs2 ...

Import the jffs2 filesystem code from Linux v5.5-rc1 and convert it
to work with barebox.

Writing is *not* supported.

Testing was done with a n25q256a-compatible QuadSPI chip on a
SoCFPGA-based Socrates board.

Testing was done with a combination of:
	user@somelinuxhost: mkfs.jffs2 --eraseblock=4 -d fs/jffs2/ -o jffs2.img
	root@target:~ flash_erase -j /dev/mtd5 0 0
	root@target:~ dd if=jffs2.img of=/dev/mtd5
	barebox@EBV SOCrates:/ mount /dev/mtd0.data
	(...)
	mounted /dev/mtd0.data on /mnt/mtd0.data

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

remove uncompilable filesystems

svn_rev_238 ...

moved mkmodestr() to fs/fs.c

svn_rev_003 ...

remove all #if 0 and #if 1

Move "ar" flags to config.mk to allow for silent "make -s" ...

Based on patch by Mike Frysinger, 20 Jun 2006

Add support for a saving build objects in a separate directory. ...

Modifications are based on the linux kernel approach and
support two use cases:

  1) Add O= to the make command line
  'make O=/tmp/build all'

  2) Set environement variable BUILD_DIR to point to the desired location
  'export BUILD_DIR=/tmp/build'
  'make'

The second approach can also be used with a MAKEALL script
'export BUILD_DIR=/tmp/build'
'./MAKEALL'

Command line 'O=' setting overrides BUILD_DIR environent variable.

When none of the above methods is used the local build is performed and
the object files are placed in the source directory.

Fix JFFS2 support for legacy NAND driver. ...

Some more NAND cleanup and small fixes.

Add support for Lite5200B board. ...

Patch by  Patch by Jose Maria (Txema) Lopez, 16 Jan 2006

Add crc of data to jffs2 (in jffs2_1pass_build_lists()). ...

Patch by Rick Bronson, 15 Jun 2005

Re-factoring the legacy NAND code (legacy NAND now only in board-specific ...

code and in SoC code). Boards using the old way have CFG_NAND_LEGACY and
BOARDLIBS = drivers/nand_legacy/libnand_legacy.a added. Build breakage for
NETTA.ERR and NETTA_ISDN - will go away when the new NAND support is
implemented for these boards.

Merge with /home/wd/git/u-boot/testing-NAND/ to add new NAND handling.

Merge with /home/m8/git/u-boot

Cleanup for GCC-4.x

Added support for TQM834x boards.

Update of new NAND code ...

Patch by Ladislav Michl, 13 Sep 2005

Merge with testing-NAND (Rewrite of NAND code)

Rewrite of NAND code based on what is in 2.6.12 Linux kernel ...

Patch by Ladislav Michl, 29 Jun 2005

Fix return values of the jffs2 commands ls/fsload/fsinfo, ...

so we can use them to, e.g., check the existence of a file with
"if ls foo; then this; else that; fi" in the hush shell
Patch by Andreas Engel, 16 August 2005

Add configuration for IFM AEV FIFO board. ...

Minor coding style cleanup.

Add common (with Linux) MTD partition scheme and "mtdparts" command ...

Old, obsolete and duplicated code was cleaned up and replace by the
new partitioning method. There are two possible approaches now:
* define a single, static partition
* use mtdparts command line option and dynamic partitioning
Default is static partitioning.

It's better to handle LZO and LZARI compression mdoes for JFFS2 with ...

a single #define.

Major upate of JFFS2 code; now in sync with snapshot of MTD CVS of ...

March 13, 2005); new configuration options CONFIG_JFFS2_LZO and
CONFIG_JFFS2_LZARI are added. Both are undefined by default.

Fix problem with symbolic links in JFFS2 code.

Patch by Klaus Heydeck, 12 May 2004: ...

Using external watchdog for KUP4 boards in mpc8xx/cpu.c;
load_sernum_ethaddr() for KUP4 boards in lib_ppc/board.c;
various changes to KUP4 board specific files

* Fix memory leak in the NAND-specific JFFS2 code ...

* Fix SL811 USB controller when attached to a USB hub

* Fix minor NAND JFFS2 related issue ...

* Fixes for SL811 USB controller:
  - implement workaround for broken memory stick
  - improve error handling

* Increase packet send timeout to 10 ms in cpu/mpc8xx/scc.c to better
  cope with congested networks.

* Back out Patch by Christian Hohnstaedt, 23 Apr 2004: ...

(JFFS2 speed enhancements) because of using non-public
  data (PHYS_FLASH_SECT_SIZE)

* Patch by Travis Sawyer, 23 Apr 2004:
  Fix VSC/CIS 8201 phy descrambler interoperability timing due to
  errata from Vitesse Semiconductor.

* Patch by Christian Hohnstaedt, 23 Apr 2004: ...

JFFS2 speed enhancements:
  - repair header CRC calculation in jffs2_1pass.c
  - add eraseblock size to the partition information to skip empty
    eraseblocks if we find more then 4k of free space.
  - The JFFS2 scanner is now fast enough to remove the spinning wheel
    so #ifdef-ed out.
  - add watchdog calls in long running loops

* Patch by Philippe Robin, 22 Apr 2004:
  Fix ethernet configuration for "versatile" board

* Patch by Kshitij Gupta, 21 Apr 2004:
  Remove busy loop and use MPU timer fr usleep() on OMAP1510/1610 boards

* Patch by Steven Scholz, 24 Feb 2004:
  Fix a bug in AT91RM9200 ethernet driver:
  The MII interface is now initialized before accessing the PHY.

* Cleanup PCI ID's

* Patch by Yasushi Shoji, 07 Apr 2004: ...

- add support for microblaze processors
  - add support for AtmarkTechno "suzaku" board

* Configure PPChameleon board to use redundand environment in flash ...

* Configure PPChameleon board to use JFFS2 NAND support.

* Added support for JFFS2 filesystem (read-only) on top of NAND flash