I have booted piCore from the USB stick instead of mmcblk device. This had a number of issues from no ssh to no backup. I managed to extend the second partition but that's the most I could do.
I've installed both 13 and the hidden 14.x version.
It seems like its a usb problem somehow?
filetool.sh -b
didn't work, I have to do this every time I reboot:
tce-load -i /mnt/sda2/optional/openssh.tcz
# populate sshd_config
sudo mkdir -p /var/lib/sshd
sudo /usr/local/sbin/sshd
No more headless installation and configuration. Not being able to backup sucks too, I have to manually mount and install tcz.