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What possible "controller feature" would be needed from the controller on the hardware side to support just another USB protocol?
by dmitrygr 6y ago
What possible "controller feature" would be needed from the controller on the hardware side to support just another USB protocol?
- kevinoid 6y agoI was curious about this as well. The issue appears to be lack of scatter-gather support. See: https://github.com/raspberrypi/linux/issues/875#issuecomment-482533041 https://github.com/raspberrypi/linux/issues/875#issuecomment...
- dmitrygr 6y agowhich is not required to implement any usb protocol. one can easily use normal DMA and still get a speed gain. since the bottleneck is not CPU, making it work a bit harder putting together those DMA descriptors is worth it.
- floatboth 6y agoapparently XHCI Streams