Sometimes if your monitor is off and olimex start first and after that just monitor is on you will get "default" resolution :
~> cat /sys/class/graphics/fb0/virtual_size
1024,768
I've created a script that fix that with recompiling initramfs, adding necessary /lib/firmware/edid/1920x1080.bin file directly into it.
Feel free to use, suggestions are welcome.
P.S.
Please add tags A20-OLinuXino-LIME2 and T2-OLinuXino-LIME2
fix_hdmi_resolution.sh