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How to partition a flash

This document describes the method to partition flash memory using TizenRT's menuconfig.

How to configure CONFIG

Flash partition is provided by configurations, FLASH_PART_SIZE, FLASH_PART_TYPE and FLASH_PART_NAME.

Flash partition can be configured the following three parameters:

  1. FLASH_PART_SIZE -- represents a partition size
  2. FLASH_PART_TYPE -- represents interface between flash and upper layer
  3. FLASH_PART_NAME -- represents partition name

All partition information is separated by comma and the last must end with a comma.
Note that the values for FLASH_PART_SIZE, FLASH_PART_TYPE and FLASH_PART_NAME must be specified in that order, as shown in the example below:

FLASH_PART_SIZE "16,48,192,32,512,2400,1536,1536,1400,8,512,"
FLASH_PART_TYPE "none,none,none,none,none,none,none,none,smartfs,config,none,"
FLASH_PART_NAME "bl1,sssro,bl2,sssfw,wlanfw,os,factory,ota,user,nvram,sssrw,"

name type size
bl1 none 16
sssro none 48
bl2 none 192
sssfw none 512
wlanfw none 2400
os none 1536
factory none 1536
user smartfs 1400
nvram config 8
sssrw none 512

In the following, we describe how to set the parameters using menuconfig.

FLASH_PART_SIZE

The unit of partition size is KB.
You can find and modify it using menuconfig as shown below:

	Board Selection -> Flash partition size

FLASH_PART_TYPE

There are none, ftl, config, smartfs and romfs.
You can find and modify it using menuconfig as shown below:

	Board Selection -> Flash partition type list

FLASH_PART_NAME

This is set to mtd name. so you can name it anything you want.
You can find and modify it using menuconfig as shown below:

	Board Selection -> Flash partition name

APPENDIX

How to set romfs partition

Here is an example to show how to set romfs partition on ARTIK05x.

  1. Modify partition configs and enable the automount config through menuconfig
    Below steps creates ROMFS partition with size 400KB at next of user partition.

    1. Split user partition size from (1400) to (1000, 400) in FLASH_PART_SIZE

      Hardware Configuration -> Board Selection -> change values at Flash partition size list (in KBytes)

    2. Append "romfs" at next of smartfs to FLASH_PART_TYPE

      Hardware Configuration -> Board Selection -> append string at Flash partition type list

    3. Append "rom" at next of user to FLASH_PART_NAME

      Hardware Configuration -> Board Selection -> append string at Flash partition name list

    4. Enable the automount config for romfs

      Hardware Configuration -> Board Selection -> Automount partitions -> [*] Automount romfs partition