uboot help/issue

[phier]

hello,

what exactly has to be done / how if I want to change a roofs partition for uboot?  I can see its written inside these two files... but i cant see how to change that ... if i can directly edit these two files or something has to be executed... 

 

 

armbianEnv.txt

boot.scr

 

 

thanks

[hexdump]

@phier - boot.scr is reading and evaluating armbianEnv.txt - so armbianEnv.txt it the proper file to change it

 

good luck and best wishes - hexdump

[phier]

@hexdump so i do not need to configure / compile anything? all the control of uboot is done via that armbianEnv.txt - ie i only edit that file and thats it? thanks

 

@hexdump it doesnt work at all.

 

can someone advice here? thanks

[hexdump]

@phier i it would be good if you would write some more details - otherwise its hard to help - for instance what system and what image you are using and what exactly you want to adjust/change ...

[phier]

 

 

@hexdump i installed latest ubuntu - armbian on sd card;

then i shrinked original partition rootfs; created now one; copied data from shrinked to the new one. And i want to boot from that new one.

 

ie if sd card was 

sdf1

now its

sdf1 (old rootfs)

sdf2 (new rootfs)

 

And i want make uboot boot from sdf2

 

thanks

 

i think

boot/boot.scr has to be also updated ?

 

setenv devnum "0"
setenv rootdev "/dev/mmcblk${devnum}p1"
 

 

i believe uboot has to be somehow recompiled to point to /dev/mmcblk0p2 instead of /dev/mmcblk0p1

[phier]

so apparently its some armbian secret.

[Werner]

2 hours ago, phier said:

armbian secret.

Secrets exposed: https://github.com/armbian/build

[phier]

uboot reads /boot/armbianEnv.txt & kernel images from the first partition marked as bootable (fdisk). Rootfs can be changed by updating armbianEnv.txt (on the first bootable partition) rootdev=UUID to boot from any partition.