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If enabled, DMA_BOUNCE_UNALIGNED_KMALLOC causes the swiotlb buffers (64MB, by default) to be allocated, even on systems where the DMA controller can reach all of RAM. This is a huge amount of RAM to waste on a device with only 512MB to start with, such as the Zero 2 W. See: https://github.com/raspberrypi/linux/issues/5975 Signed-off-by: Phil Elwell <phil@raspberrypi.com>