Enable IPv6, netfilter, VLAN_8021Q
Enable more Bluetooth UART protocols
Enable more crypto options

Forces spi-atmel to always use DMA mode instead of switching between
PIO and DMA depending on the transfer size.  Switching between the two
can cause Rx buffer corruption with the 3.12 driver.

This comes at the cost of lower performance (15 to 20%) for small
transfers (1-15 bytes), but improves reliability for protocols that use small
and large transfers regularly.
For large transfers (1024 bytes), DMA mode is 300% faster than PIO.

https://lkml.org/lkml/2013/10/21/534