Add DMA buffer allocation pool.
Defconfig hacks to get me a console.
Make the init code compile if we don't have the granule allocator / dma allocator required
Cut down 'tests file' for debugging
Merge branch 'master' into fat-dma
Merge branch 'master' of github.com:PX4/Firmware into fat-dma
Disabling debug output for further testing
Merge branch 'master' into fat-dma
Merge branch 'master' of github.com:PX4/Firmware into fat-dma
Move IRQ restore to right position
Use the generic device::SPI locking strategy.
Trust on the microSD for params for now
Merge remote-tracking branch 'origin/spi-device-locking' into fat-dma-spi
Minor cleanups in the drivers
Merge branch 'fat-dma-spi'