how to change uEnv.txt from U boot interface ?

[Yahya ahmed]

Hi all,

I made some changes on the uEnv.txt file from my computer , then I rebooted my beaglebone.

Now it starts the u-boot and writes "starting kernel" and it just hangs. 

My system(ubuntu) can't see the beaglebone anymore when I connect it using USB, so I can't re-edit my uEnv.txt 

So, is there anyway I can undo my edits on uEnv.txt ?? Can I do it from the U-Boot interface ?

[William Hermans]

Fist, you would get an sdcard, and flash an image to it. http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#microSD.2FStandalone:_.28console.29_.28BeagleBone.2FBeagleBone_Black.2FBeagleBone_Green.29

Once you have that image on an sdcard, you boot as normal- with the sdcard inserted of course. Then:

#1
login as: root
Debian GNU/Linux 8
BeagleBoard.org Debian Image 2016-06-19
Support/FAQ: http://elinux.org/Beagleboard:BeagleBoneBlack_Debian
default username:password is [debian:temppwd]

#2
root@beaglebone:~# lsblk
NAME         MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
mmcblk0boot0 179:8    0    2M  1 disk
mmcblk0boot1 179:16   0    2M  1 disk
mmcblk0      179:0    0  3.7G  0 disk
`-mmcblk0p1  179:1    0  3.7G  0 part /

#3
root@beaglebone:~# mkdir /media/rootfs

#4
root@beaglebone:~# mount /dev/mmcblk0p1 /media/rootfs/

#5
root@beaglebone:~# cd /media/rootfs/

#6
root@beaglebone:/media/rootfs# nano boot/uEnv.txt

#7
undo the changes you made. If you can not remember the changes you've made, it may be easier to just reflash the eMMC.

--
For more options, visit http://beagleboard.org/discuss
---
You received this message because you are subscribed to the Google Groups "BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscribe@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/28648227-fba7-407a-af9c-10b8f2477692%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[zdenko...@gmail.com]

Hi Ahmed,

I write a bit later but it can help someone else. 

If you have a backup of uEnv.txt - so than it is quick and simple. 

First copy file content to RAM memory:

ext4load mmc 1 0x80000000 /boot/uEnv.txt_bck

Write content of file to new file:

ext4write mmc 1 0x80000000 /boot/uEnv.txt 2042 0

mmc 1 - it is my rootfs partition. Use the command mmc list to see the partition.

[John Allwine]

This is how I did it using a microSD card: https://groups.google.com/forum/m/#!category-topic/beagleboard/b21LZKh8z2w

John Allwine

Principal Software Engineer

https://www.pocketnc.com

On May 6, 2020, at 7:23 AM, zdenko...@gmail.com wrote:



--
For more options, visit http://beagleboard.org/discuss
---
You received this message because you are subscribed to the Google Groups "BeagleBoard" group.

To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/ce8683ff-d37a-4b71-b422-6c57e7fe57eb%40googlegroups.com.