I formatted the SD with the camera, loaded again the files, used eoscard to make it bootable but get only a brief blink of the green led.
So it seems that EOScard doesn't work well.
FWIW, the problem here is likely you formatting the SD card with the camera. Depending on the size of the card, that got you an exFAT formated card, rather than the FAT32 format that is required for autobooting. EOScard only writes the necessary string to the SD card boot block for autobooting - it does not format the card for you. STICK will format a card correctly for autobooting.
I guess it's also possible that you did not set the radio buttons in EOScard correctly ?
Edit : IIRC, EOScard has one other peculiarity - you don't use the
Save button to write to the card. You actually have to click on the big square button that has the CHDK logo on it.