[LEDE-DEV] WRT1900ACS - Kernel 4.4.12 boot failure

[Claudio Leite]

On 06/07/2016 10:48 AM, Dheeran Senthilvel wrote:
[snip]
> =======> Step 3: Reboot <======
> 	After the above procedures, I don’t have the error anymore.

Great -- so you're all set, as far as you can tell?

> Wonder what really caused the problem in first place.

Given the date when you initially had the issue I suspected that it was 
due to bugs in the NAND driver that potentially messed things up in your 
u_env. I would have expected 'resetenv' to make quick work of cleaning 
that up.

It sort of looks like resetenv only half-cleared the problem. At least 
on the other model I tested it on it claims to erase the partition. 
Something goes wrong at some point here on your model and the old 
corrupted data was kept. 'saveenv' forces rewriting the good data back 
to flash.

 > Also when we reboot from Failsafe the recovery is automatically 
triggered - is this normal.

Failsafe won't reset the failed boot counter, so if it's gone more than 
three times since the last successful boot it will indeed trigger 
auto-recovery.

> One more doubt would be, should 'env reset' be in this order.
> resetenv ——> reset ——> printing ——> saveenv ——> reset

'printenv' is just a check. I would say

   resetenv; reset

followed by a reboot, and

   saveenv; reset

(or even saveenv; boot)

should be sufficient.

-Claudio