The only thing I have done has been Reflash.
Reflashing the OpenWrt-Yun image on the Yún
And everything seemed Ok, but...
I didn't say that with the LininoOs I had expanded my Yun with a 8GB microSD Card (4GB data, 4GB Linux) following the steps How to expand the Yún disk space.
Now, when I have done the reflash, the microSD Card was in the board. I thought that the reflashing of the OpenWrt-Yun image would be in the flash memory and that I would have to expand again in the microSD Card.
So after reflash, I tried to expand, this time (5GB data, 3GB Linux) and the process stopped at this point:
"Partitioning (this will take a while)"
I just thought it didn't work, and after a while I decided to unplug the board, take off the microSD Card to format it, and try again, but when I plugged the Yun again, I couln't see the COM port, so I thought that probably part of the linux still was in the microSD Card, so I placed the card in the Yun and then I could see the COM port.
Then I checked the space on the card was:
root@Arduino:/# df -h / /mnt/sda1
Filesystem Size Used Available Use% Mounted on
rootfs 6.9M 356.0K 6.6M 5% /
/dev/sda1 4.9G 12.0K 4.9G 0% /mnt/sda1
Where the rootfs 6.9M doesn't has sense, it must be 3GB.
Are there a way to reflash the OpenWrt-Yun image only in the flash memory, to be able to format the microSD Card and try to expand again?
Or something else...
It looks that I can't access the serial port COM without the microSD card.