nuttx-apps/system/cfgdata/Kconfig
Ken Pettit 88c78b6a0c apps/system/configdata: Adds an "cfgdata" command which allows manipulation of the /dev/config items via the command line. One such use for this utility would be to set a "macaddr" configdata item, etc. The utility is sort-of like a u-boot env variable edit function:
For instance, to set a "macaddr" when the new CONFIG_MTD_CONFIG_NAMED option is selected, you would do:

nsh> cfgdata set macaddr [0xfc 0x01 0x0b 0x45 0xa1 0x12] <-- brackets denotes an array of bytes
nsh> cfgdata set hostname myboard

or using the old ID,INSTANCE numeric method:

nsh> cfgdata set 0,0 [0xfc 0x01 0x0b 0x45 0xa1 0x12]      <-- brackets denotes an array of bytes
nsh> cfgdata set 1,0 myboard

You can also display all config items:

nsh> cfgdata print all
Name                    Len   Data
macaddr                 6     0xFC 0x01 0x0B 0x45 0xA1 0x12
hostname                8     myboard
2018-12-20 14:24:51 -06:00

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#
# For a description of the syntax of this configuration file,
# see the file kconfig-language.txt in the NuttX tools repository.
#
config SYSTEM_CFGDATA
tristate "Cfgdata Command"
default n
depends on MTD_CONFIG && NSH_BUILTIN_APPS
---help---
Enable support for the CFGDATA tool.
if SYSTEM_CFGDATA
endif