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linux/drivers/mtd/Kconfig
Dan Ehrenberg 727dc612c4 mtd: part: Create the master device node when partitioned 
For many use cases, it helps to have a device node for the entire
MTD device as well as device nodes for the individual partitions.
For example, this allows querying the entire device's properties.
A common idiom is to create an additional partition which spans
over the whole device.

This patch makes a config option, CONFIG_MTD_PARTITIONED_MASTER,
which makes the master partition present even when the device is
partitioned. This isn't turned on by default since it presents
a backwards-incompatible device numbering.

The patch also makes the parent of a partition device be the master,
if the config flag is set, now that the master is a full device.

Signed-off-by: Dan Ehrenberg <dehrenberg@chromium.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
2015-04-05 17:44:01 -07:00

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menuconfig MTD
tristate "Memory Technology Device (MTD) support"
depends on GENERIC_IO
help
Memory Technology Devices are flash, RAM and similar chips, often
used for solid state file systems on embedded devices. This option
will provide the generic support for MTD drivers to register
themselves with the kernel and for potential users of MTD devices
to enumerate the devices which are present and obtain a handle on
them. It will also allow you to select individual drivers for
particular hardware and users of MTD devices. If unsure, say N.
if MTD
config MTD_TESTS
tristate "MTD tests support (DANGEROUS)"
depends on m
help
This option includes various MTD tests into compilation. The tests
should normally be compiled as kernel modules. The modules perform
various checks and verifications when loaded.
WARNING: some of the tests will ERASE entire MTD device which they
test. Do not use these tests unless you really know what you do.
config MTD_REDBOOT_PARTS
tristate "RedBoot partition table parsing"
---help---
RedBoot is a ROM monitor and bootloader which deals with multiple
'images' in flash devices by putting a table one of the erase
blocks on the device, similar to a partition table, which gives
the offsets, lengths and names of all the images stored in the
flash.
If you need code which can detect and parse this table, and register
MTD 'partitions' corresponding to each image in the table, enable
this option.
You will still need the parsing functions to be called by the driver
for your particular device. It won't happen automatically. The
SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for
example.
if MTD_REDBOOT_PARTS
config MTD_REDBOOT_DIRECTORY_BLOCK
int "Location of RedBoot partition table"
default "-1"
---help---
This option is the Linux counterpart to the
CYGNUM_REDBOOT_FIS_DIRECTORY_BLOCK RedBoot compile time
option.
The option specifies which Flash sectors holds the RedBoot
partition table. A zero or positive value gives an absolute
erase block number. A negative value specifies a number of
sectors before the end of the device.
For example "2" means block number 2, "-1" means the last
block and "-2" means the penultimate block.
config MTD_REDBOOT_PARTS_UNALLOCATED
bool "Include unallocated flash regions"
help
If you need to register each unallocated flash region as a MTD
'partition', enable this option.
config MTD_REDBOOT_PARTS_READONLY
bool "Force read-only for RedBoot system images"
help
If you need to force read-only for 'RedBoot', 'RedBoot Config' and
'FIS directory' images, enable this option.
endif # MTD_REDBOOT_PARTS
config MTD_CMDLINE_PARTS
tristate "Command line partition table parsing"
depends on MTD
---help---
Allow generic configuration of the MTD partition tables via the kernel
command line. Multiple flash resources are supported for hardware where
different kinds of flash memory are available.
You will still need the parsing functions to be called by the driver
for your particular device. It won't happen automatically. The
SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for
example.
The format for the command line is as follows:
mtdparts=<mtddef>[;<mtddef]
<mtddef> := <mtd-id>:<partdef>[,<partdef>]
<partdef> := <size>[@offset][<name>][ro]
<mtd-id> := unique id used in mapping driver/device
<size> := standard linux memsize OR "-" to denote all
remaining space
<name> := (NAME)
Due to the way Linux handles the command line, no spaces are
allowed in the partition definition, including mtd id's and partition
names.
Examples:
1 flash resource (mtd-id "sa1100"), with 1 single writable partition:
mtdparts=sa1100:-
Same flash, but 2 named partitions, the first one being read-only:
mtdparts=sa1100:256k(ARMboot)ro,-(root)
If unsure, say 'N'.
config MTD_AFS_PARTS
tristate "ARM Firmware Suite partition parsing"
depends on ARM
---help---
The ARM Firmware Suite allows the user to divide flash devices into
multiple 'images'. Each such image has a header containing its name
and offset/size etc.
If you need code which can detect and parse these tables, and
register MTD 'partitions' corresponding to each image detected,
enable this option.
You will still need the parsing functions to be called by the driver
for your particular device. It won't happen automatically. The
'physmap' map driver (CONFIG_MTD_PHYSMAP) does this, for example.
config MTD_OF_PARTS
tristate "OpenFirmware partitioning information support"
default y
depends on OF
help
This provides a partition parsing function which derives
the partition map from the children of the flash node,
as described in Documentation/devicetree/bindings/mtd/partition.txt.
config MTD_AR7_PARTS
tristate "TI AR7 partitioning support"
---help---
TI AR7 partitioning support
config MTD_BCM63XX_PARTS
tristate "BCM63XX CFE partitioning support"
depends on BCM63XX
select CRC32
help
This provides partions parsing for BCM63xx devices with CFE
bootloaders.
config MTD_BCM47XX_PARTS
tristate "BCM47XX partitioning support"
depends on BCM47XX || ARCH_BCM_5301X
help
This provides partitions parser for devices based on BCM47xx
boards.
comment "User Modules And Translation Layers"
#
# MTD block device support is select'ed if needed
#
config MTD_BLKDEVS
tristate
config MTD_BLOCK
tristate "Caching block device access to MTD devices"
depends on BLOCK
select MTD_BLKDEVS
---help---
Although most flash chips have an erase size too large to be useful
as block devices, it is possible to use MTD devices which are based
on RAM chips in this manner. This block device is a user of MTD
devices performing that function.
At the moment, it is also required for the Journalling Flash File
System(s) to obtain a handle on the MTD device when it's mounted
(although JFFS and JFFS2 don't actually use any of the functionality
of the mtdblock device).
Later, it may be extended to perform read/erase/modify/write cycles
on flash chips to emulate a smaller block size. Needless to say,
this is very unsafe, but could be useful for file systems which are
almost never written to.
You do not need this option for use with the DiskOnChip devices. For
those, enable NFTL support (CONFIG_NFTL) instead.
config MTD_BLOCK_RO
tristate "Readonly block device access to MTD devices"
depends on MTD_BLOCK!=y && BLOCK
select MTD_BLKDEVS
help
This allows you to mount read-only file systems (such as cramfs)
from an MTD device, without the overhead (and danger) of the caching
driver.
You do not need this option for use with the DiskOnChip devices. For
those, enable NFTL support (CONFIG_NFTL) instead.
config FTL
tristate "FTL (Flash Translation Layer) support"
depends on BLOCK
select MTD_BLKDEVS
---help---
This provides support for the original Flash Translation Layer which
is part of the PCMCIA specification. It uses a kind of pseudo-
file system on a flash device to emulate a block device with
512-byte sectors, on top of which you put a 'normal' file system.
You may find that the algorithms used in this code are patented
unless you live in the Free World where software patents aren't
legal - in the USA you are only permitted to use this on PCMCIA
hardware, although under the terms of the GPL you're obviously
permitted to copy, modify and distribute the code as you wish. Just
not use it.
config NFTL
tristate "NFTL (NAND Flash Translation Layer) support"
depends on BLOCK
select MTD_BLKDEVS
---help---
This provides support for the NAND Flash Translation Layer which is
used on M-Systems' DiskOnChip devices. It uses a kind of pseudo-
file system on a flash device to emulate a block device with
512-byte sectors, on top of which you put a 'normal' file system.
You may find that the algorithms used in this code are patented
unless you live in the Free World where software patents aren't
legal - in the USA you are only permitted to use this on DiskOnChip
hardware, although under the terms of the GPL you're obviously
permitted to copy, modify and distribute the code as you wish. Just
not use it.
config NFTL_RW
bool "Write support for NFTL"
depends on NFTL
help
Support for writing to the NAND Flash Translation Layer, as used
on the DiskOnChip.
config INFTL
tristate "INFTL (Inverse NAND Flash Translation Layer) support"
depends on BLOCK
select MTD_BLKDEVS
---help---
This provides support for the Inverse NAND Flash Translation
Layer which is used on M-Systems' newer DiskOnChip devices. It
uses a kind of pseudo-file system on a flash device to emulate
a block device with 512-byte sectors, on top of which you put
a 'normal' file system.
You may find that the algorithms used in this code are patented
unless you live in the Free World where software patents aren't
legal - in the USA you are only permitted to use this on DiskOnChip
hardware, although under the terms of the GPL you're obviously
permitted to copy, modify and distribute the code as you wish. Just
not use it.
config RFD_FTL
tristate "Resident Flash Disk (Flash Translation Layer) support"
depends on BLOCK
select MTD_BLKDEVS
---help---
This provides support for the flash translation layer known
as the Resident Flash Disk (RFD), as used by the Embedded BIOS
of General Software. There is a blurb at:
http://www.gensw.com/pages/prod/bios/rfd.htm
config SSFDC
tristate "NAND SSFDC (SmartMedia) read only translation layer"
depends on BLOCK
select MTD_BLKDEVS
help
This enables read only access to SmartMedia formatted NAND
flash. You can mount it with FAT file system.
config SM_FTL
tristate "SmartMedia/xD new translation layer"
depends on BLOCK
select MTD_BLKDEVS
select MTD_NAND_ECC
help
This enables EXPERIMENTAL R/W support for SmartMedia/xD
FTL (Flash translation layer).
Write support is only lightly tested, therefore this driver
isn't recommended to use with valuable data (anyway if you have
valuable data, do backups regardless of software/hardware you
use, because you never know what will eat your data...)
If you only need R/O access, you can use older R/O driver
(CONFIG_SSFDC)
config MTD_OOPS
tristate "Log panic/oops to an MTD buffer"
help
This enables panic and oops messages to be logged to a circular
buffer in a flash partition where it can be read back at some
later point.
config MTD_SWAP
tristate "Swap on MTD device support"
depends on MTD && SWAP
select MTD_BLKDEVS
help
Provides volatile block device driver on top of mtd partition
suitable for swapping. The mapping of written blocks is not saved.
The driver provides wear leveling by storing erase counter into the
OOB.
config MTD_PARTITIONED_MASTER
bool "Retain master device when partitioned"
default n
depends on MTD
help
For historical reasons, by default, either a master is present or
several partitions are present, but not both. The concern was that
data listed in multiple partitions was dangerous; however, SCSI does
this and it is frequently useful for applications. This config option
leaves the master in even if the device is partitioned. It also makes
the parent of the partition device be the master device, rather than
what lies behind the master.
source "drivers/mtd/chips/Kconfig"
source "drivers/mtd/maps/Kconfig"
source "drivers/mtd/devices/Kconfig"
source "drivers/mtd/nand/Kconfig"
source "drivers/mtd/onenand/Kconfig"
source "drivers/mtd/lpddr/Kconfig"
source "drivers/mtd/spi-nor/Kconfig"
source "drivers/mtd/ubi/Kconfig"
endif # MTD
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