• State Resolved
  • Locked Locked
  • Replies 6 replies
  • Subscribers 100 subscribers
  • Views 26721 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

How to reset/erase u-boot environments?

Zhe Ji
Prodigy 220 points
Other Parts Discussed in Thread: OMAP-L137

Hello,

I am working on a project with OMAP-L137 EVM. I mistakenly input an u-boot environment command and couldn't delete it by using "setenv" or refreshing u-boot.

Is there anyway to erase the u-boot environments?

Thank you!

Zhe

  • 0
    TI__Mastermind 43955 points

    Hi Zhe,

    yes, using the same "setenv" or "Set" commands you can delete the u-boot environment variable by following the syntax given below

    setenv ipaddr 10.100.2.202 --- > will set the ipaddr

    setenv ipaddr                         ---> will delete the ipaddr if the argument is NIL.

     

    Regards,

    Shankari.

     

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

    Please click the Verify Answer button on this post if it answers your question.
    --------------------------------------------------------------------------------------------------------

  • 0 in reply to Shankari G
    Prodigy 220 points

    Hi Shankari,

    Thank you for the reply. I did try the setenv command but it is not working. I used printenv and it showed:

    s fprobe 0=sf write

    I tried:

    setenv s  --> it returned s is not exit

    setenv "s fprobe 0" --> returns s fprobe 0 is not exit

    setenv s" "fprobe" "0 --> returns s fprobe 0 is not exit

    I guess the variable name is including some strange  symbols that do not print in the console. So I want to erase it directly from memory.

    Thank you

    Zhe

  • 0 in reply to Zhe Ji
    TI__Guru** 116170 points

    What is the version of  PSP package are you using.  The prebuilt uboot part of the PSP 3.21 release shouldn`t have this issue.

    http://processors.wiki.ti.com/index.php/DaVinci_%28ARM9%29_PSP_Releases

    Regards,

    Rahul

  • 0 in reply to Rahul Prabhu
    Prodigy 220 points

    The PSP 03.20.00.14 (Linux kernel version 2.6.33-rc4). I think the problem happens because of my Minicom. It cannot handle arrow key properly. I tried to refresh the u-boot using the prebuilt one. But it did not reset the environments variables. I am now trying to recompile u-boot to enable some commands like flinfo and hopefully it can help me located where the variables are store.

    Thank you

    Zhe

  • 0 in reply to Zhe Ji
    Prodigy 210 points

    Hello Zhe,

    Use the following technique:

    sf probe 0

    mw.b 0x81000000 0xff <env section size in spi>

    sf write 0x81000000 <env section start addr in spi> <env section size in spi>

    reset

    saveenv

    <set the variables you want>

    You can find out the environment size and section start address by looking at the config header for your board's uboot (for example uboot_folder/include/configs/da830evm.h). Environment size = CONFIG_ENV_SIZE and start address = CONFIG_ENV_OFFSET.

    Bindu

  • 0 in reply to Bindu Jagannatha
    Prodigy 220 points

    Hi Bindu,

    Your method works. Thank you!

    Zhe