I appriciate your comment, it sounds good. The problem that I am asking is actualy to control the OLED display on ZedBoard not using a hardware designe for the PL, but do all that on the PS (software based).
Thank you for your comment. I maybe have a wrong version of linux, however when I boot it on the ZedBoard from SD card, I see the Digilent logo apearing by defoult on the OLED screen (see the image attached). Of course I can disable and enable it againt (running the scripts /usr/bin/unload_oled and /usr/bin/load_oled respectively) and I found out that the logo is stored as /root/logo.bin. I also know that in this version of linux there is a built in display driver for the OLED, pmodoled-gpio.ko, but I do not know how to use all this stuff in order to create my own collection of characters (or use any existing alphanumerics ones) to display my own data.