Problem with BRD_SD_FENCE

Hello

I have an issue with this BRD_SD_FENCE parameter. Because it says I can add value to it between 0 and 64, which represent extra space for fence on the SD card.
My problem is that if I increase this value over 2 I do not get more space for fence items. Despite of the increasement on the value I got the same erro message that: “Only 255 items are supported”.

Any idea of solving this problem?