[cmd] clarification on syntax of 'chpart' command

[Adarsh Babu Kalepalli]

Hi,

u-boot version: U-Boot 2021.07-rc1
Board: Beaglebone Black

I was trying to verify and use 'chpart' command on Beaglebone black with an
SDHC card ( with multiple partitions ) and am unable to get its exact
syntax.Is this command applicable to
any particular category of storage devices (viz. NOR flash,NAND flash etc)??
I tried using it as in its "help output" and also other combinations,
Am I missing anything,Please suggest its correct usage.

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Output Log from U-boot shell:
----------------------------------------
=> mmc list
OMAP SD/MMC: 0 (SD)
OMAP SD/MMC: 1
=> mmc dev 0
switch to partitions #0, OK
mmc0 is current device
=> mmc part

Partition Map for MMC device 0  --   Partition Type: DOS

Part    Start Sector    Num Sectors     UUID            Type
  1     2048            524288          11d09956-01     0c Boot
  2     526336          524288          11d09956-02     0c
  3     1050624         524288          11d09956-03     83
  4     1574912         524288          11d09956-04     83
=> chpart mmc0:2
Device nand0 not found!
=> chpart mmc0:3
Device nand0 not found!
=> chpart mmc2
Device nand0 not found!
=> chpart
Device nand0 not found!
=> help chpart
chpart - change active partition

Usage:
chpart part-id
    - change active partition (e.g. part-id = nand0,1)
=>
=> chpart part-id=mmc0
Device nand0 not found!
=> chpart part-id=mmc1
Device nand0 not found!
=> chpart part-id = mmc1
chpart - change active partition

Usage:
chpart part-id
    - change active partition (e.g. part-id = nand0,1)
=>
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Regards,
Adarsh