[FS#1071] Sysupgrade fails when kernel console is disabled

[LEDE Bugs]

The following task has a new comment added:

FS#1071 - Sysupgrade fails when kernel console is disabled
User who did this - Koen Vandeputte (xback)

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Issue identified:


The wiki page [1] states that the ventana kernel prints can be disabled using following u-boot command:

setenv console
saveenv



In this case, I would expect the following line checking the kernel boot using dmesg:
[    0.000000] Kernel command line: ubi0:ubi ubi.mtd=2 rootfstype=squashfs,ubifs


But I'm seeing this:
[    0.000000] Kernel command line: console=,115200 ubi0:ubi ubi.mtd=2 rootfstype=squashfs,ubifs


I've also tried this:

setenv console null
saveenv

Which results in this one:
[    0.000000] Kernel command line: console=null,115200 ubi0:ubi ubi.mtd=2 rootfstype=squashfs,ubifs



Practically, these faulty strings cause sysupgrade to reboot instantly as soon as the upgrade starts. (100% repro rate)
When removing the faulty **console=** line from the kernel bootargs, sysupgrade works perfectly again. 

I've reported this back to Gateworks Corp.


[1]
http://trac.gateworks.com/wiki/silenceconsole#DisableKernelserialconsole

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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1071#comment3672