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a4857688c3
With 6.5+ (specifically, if DMA_BOUNCE_UNALIGNED_KMALLOC is set) the SWIOTLB is used, and it defaults to 64MB. This is too much when there's only 256MB of RAM, so request 0 slabs and lets the kernel round up to the appropriate minimum (1MB on aarch64, typically). In virtual hardware there's very little need for these bounce buffers, so the 64MB would be mostly wasted. (From OE-Core rev: 369e768d87b80be9efe76937bfafeddabc35f559) Signed-off-by: Ross Burton <ross.burton@arm.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>