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CONFIG_MTD_CMDLINE_PARTS: Command line partition table parsing

General informations

The Linux kernel configuration item CONFIG_MTD_CMDLINE_PARTS has multiple definitions:

Command line partition table parsing found in drivers/mtd/Kconfig

The configuration item CONFIG_MTD_CMDLINE_PARTS:

Help text

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 (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'.

Command line partition table parsing found in drivers/mtd/Kconfig

The configuration item CONFIG_MTD_CMDLINE_PARTS:

Help text

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 (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'.

Hardware

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