After be one of the 8 persons with the wifi chip problem, now the rma that i got have the second slot without work. I am very lucky seems. 
I checked all the sd cards i have at home, and all are working in the first slot, but any one in the second.
When i put a card in the second, the led turn on for a very very sort time, compared to the first slot. dmesg dont register any event about the second slot...
I was looking but i didnt found anything that solve this... maybe i missed something, maybe, again... it is a hardware problem... (i really hope all these problems are paid by board company)
I checked all the sd cards i have at home, and all are working in the first slot, but any one in the second.
When i put a card in the second, the led turn on for a very very sort time, compared to the first slot. dmesg dont register any event about the second slot...
I was looking but i didnt found anything that solve this... maybe i missed something, maybe, again... it is a hardware problem... (i really hope all these problems are paid by board company)