What is the fine-grained topic of the following text: CFLAGS="-O2 -pipe -march=core-avx2 -mabm -madx -mavx256-split-unaligned-load -mavx256-split-unaligned-store -mprfchw -mrdseed"
The two USB 3 ports require the xHCI driver to function with USB 3 devices and the EHCI driver to function with non-USB 3 devices. Only return the topic.
Computer Programming and Driver Requirements