U-boot env variables

[Anupama K Pillai]

Hi Anil Sir and team, 

 Can anyone help me with finding location of U-boot environment variables?

In my case, printenv, setenv and saveenv are successful but the set value is not used in next booting.

My board successfully boots from sd-card and flash memory. 

If I give setenv and printenv,  it shows the value that was set.

Saveenv gives the following in both booting from sd-card and flash.

-----------------------------

saveenv

Saving Environment to MMC...

Writing to MMC(1)... done

------------------------

It seems that the env values are written to flash memory.But the set value is not used in next booting.

Say for eg, I set quiet in boot args as given below.

-----------------------------------------------

bootargs=console=ttyS2,115200 androidboot.console=ttyS2  quiet

---------------------------------------

Upon next booting, console logs are not suppressed and kernel cmd line from cat /proc/cmdline shows the following:

# cat /proc/cmdline

console=ttyO2,115200n8 root=PARTUUID=2afbd824-02 rw rootfstype=ext4 rootwait

(quiet is not shown here and not applied)

Please help.

regards,

Anupama

[Anil Kumar Pugalia]

It really depends on the Uboot code, if it is considering the saved environment, or reverting it back to some default set in the code.

Regards
Anil

Passion: http://sysplay.in (Playing with Systems)

Anupama K Pillai wrote on 30/03/21 10:49 am:

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