u-boot env parameter storage of GLSDK

yangwoo Lee

I'm working on GLSDK with jacinto6 board and booting it using SD card

I modify u-boot environment using "setenv, saveenv" and change SD card which newly flashed and boot again.

But u-boot environment was still applied with my last change. In spite of I'm using other SD card

(I expected that u-boot environment must be back to default with new SD card)

If u-boot env is saved to other storage, please tell me.(As I know jacinto6 evm board support many storage... sdcard, emmc, nand, qspi flash...)

I like to format or recover it to default value set

Thank you

for example,

1. boot with sd card#1 and check if "bootdelay=1"

2. setenv bootdelay 5;saveenv

3. remove sd card#1 and insert sd card#2(newly flashed in glsdk)

4. boot with sd card#2 and command "printenv"

5. It print bootdelay=5(I don't know why it still bootdelay=5 despite glsdk initial value is 1

over 9 years ago

0 Titusrathinaraj Stalin over 9 years ago

TI__Guru** 116100 points

Dear Yangwoo,
Where your env variables get stored while you do "saveenv" ?

Can you please attach the log while you do "saveenv" command ?

NAND flash or any other device ?

I would like you to use the "uEnv.txt" file to store the u-boot env variables on particular SD card based on your requirement and also default value would be stored.

0 yangwoo Lee over 9 years ago in reply to Titusrathinaraj Stalin

Intellectual 910 points

Thank you for your fast answer

I'm using uEnv.txt
uEnv.txt exist in /boot partition of my sdcard
but there are simple u-boot env like bootargs....
I like to recover command set like "mmcboot, findfdt..." which made by TI side..
Can you tell me how to recover it to default or initial state? After I use saveenv with change, I can't recover it to initial state.
Should I use "mmc erase" to delete u-boot env data block?

below is log of saveenv
U-Boot# saveenv
Saving Environment to MMC...
Writing to redundant MMC(1)... done
U-Boot#

0 Titusrathinaraj Stalin over 9 years ago in reply to yangwoo Lee

TI__Guru** 116100 points

To reset the env variables, do the following.

u-boot# env default -f

OR

u-boot# env default -a -f

0 yangwoo Lee over 9 years ago in reply to yangwoo Lee

Intellectual 910 points

u-boot env looks saved in emmc (mmc dev 1)
My board has configuration that mmc0 is sdcard and mmc1 is emmc.

I tried below command , after then I can see default u-boot env (bootdelay=2 -> bootdelay=1)
Evne I changed to othaer SD card.

mmc erase 0 0x102400

But Im still don't know what is accurate address and size to delete saved u-boot env.

0 Titusrathinaraj Stalin over 9 years ago in reply to yangwoo Lee

TI__Guru** 116100 points

You have to check the config file in u-boot source code to know the size and location of u-boot env.

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u-boot env parameter storage of GLSDK