config PCI bool "PCI support" depends on SYS_SUPPORTS_PCI help Find out whether you have a PCI motherboard. PCI is the name of a bus system, i.e. the way the CPU talks to the other stuff inside your box. If you have PCI, say Y, otherwise N. config SH_PCIDMA_NONCOHERENT bool "Cache and PCI noncoherent" depends on PCI default y help Enable this option if your platform does not have a CPU cache which remains coherent with PCI DMA. It is safest to say 'Y', although you will see better performance if you can say 'N', because the PCI DMA code will not have to flush the CPU's caches. If you have a PCI host bridge integrated with your SH CPU, refer carefully to the chip specs to see if you can say 'N' here. Otherwise, leave it as 'Y'.