Issues to boot snappy on the beaglebone black

[Sujeevan Vijayakumaran]

Hey all,

I tried to boot snappy on the beaglebone black and I had a few issues,
which I resolved, but I don't know why and where the exact problem is.

I followed the installation guide for the beaglebone black[1]. I did this:

$ wget http://releases.ubuntu.com/15.04/ubuntu-15.04-snappy-armhf-bb.img.xz
$ unxz ubuntu-15.04-snappy-armhf-bb.img.xz
$ sudo dd if=ubuntu-15.04-snappy-armhf-bbb.img of=/dev/mmcblk0 bs=32M

This was fine so far.

Then I inserted the micro sd card to the BBB, pressed the S2-Boot-Button
and connected the power. This is the output on the serial console:
http://paste.ubuntu.com/11163808/

Then I tried booting without pressing the boot-button:
http://paste.ubuntu.com/11163841/

Both variants aren't booting, so I found the solution here[2]:

I've mounted the system-boot partition of the micro SD card on my laptop
and edited uEnv.txt. I've changed the following line from:

uenvcmd=load mmc ${bootpart} ${loadaddr} snappy-system.txt; env import
-t $loadaddr $filesize; run snappy_boot

to:

uenvcmd=load mmc ${mmcdev}:${mmcpart} ${loadaddr} snappy-system.txt; env
import -t $loadaddr $filesize; run snappy_boot

Next step: booting without pressing the boot-button (like the docs
says): http://paste.ubuntu.com/11163853/

Final step:
Booting the device with pressing the boot-button. It worked on this point.

I don't know what the exact problem of my issue is. I've fixed it, but I
don't think this is an intentional behaviour. Anyway I think, that the
image should work on my beaglebone without modifying the uEnv.txt.

-- Sujeevan (svij)

[1] https://developer.ubuntu.com/en/snappy/start/
[2]
https://askubuntu.com/questions/576227/ubuntu-core-webdm-alpha-for-beaglebone-black-not-booting