[PATCH/RFC] Introduce nandsim command

[Alexander Aring]

Introduce nandsim command for develop/test nand mtd software.
Based on the nandsim kernel module. Don't know the version anymore.

The data which nandsim holds are in malloc space.
The original module can use a file to operate on this.
I removed this implementation, because it used the page-cache and I don't
have a page-cache in barebox.

I used nandsim in the following szenario:
	- barebox sandbox system with -i command to get a /dev/fd# device.
	- in barebox system you can use 'cp /dev/fd# /dev/nandsim#.
	- do some testing things on /dev/nandsim#
	- afterwards writeback with /dev/nandsim# /dev/fd#

This works for example with a envfs image.
Maybe I will add to synchronize with /dev/fd#(or another file) directly on changes.

It needs a high malloc space and a high max argument number for commands.

Please look at help text to see all parameters. I don't test all of these.

I added two parameters to supply a random seed and to manipulate a
bitflip_chance per page.
To manipulate the bitflip_chance is not a nice solution at the moment.

I send this patches, because maybe somebody can use it
to test things with ubiformat.

The nandsim implementation is not done yet!

Alexander Aring (1):
  nandsim: add nandsim command

 commands/Kconfig   |   11 +
 commands/Makefile  |    1 +
 commands/nandsim.c | 2495 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 2507 insertions(+)
 create mode 100644 commands/nandsim.c

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1.8.0