One line solution did not help.
DMA found at DUEZoo/dmaspi.ino at master 路 manitou48/DUEZoo 路 GitHub works perfectly.
I tested at 42MHz (Div by 2)
Still didn't manage to program the chip, but I don't think it's Arduino's fault anymore, probably my wires can't handle the high frequency.
See scope obtained, I transmitted 0xAAAA 0xAAAA ... etc
Channel 1 is the MOSI, at 42 MHz
Channel 2 is the latch enable which is pulled low!
Thanks for your help everyone 
