On 08/05/2013 02:02 PM, H. Peter Anvin wrote: > On 08/05/2013 01:29 PM, Ondrej Zajicek wrote: >> >> How this could even work? AFAIK these cards have to be explicitly programmed >> to enable MMIO (which was not done in the patches). These patches claim that >> it is for multi-domain PCI. I would guess that vgabase is NULL in common >> configurations but if it is non-NULL, it probably wouldn't work, unless >> there is some hardware magic that transparently converts MMIO (from CPU PoV) >> to port IO (from card/PCI PoV). >> > > They presumably use iowrite/ioread, which use either I/O instructions or > memory instructions depending on the address. > So the confusion really is in the iowrite interface, which can take either a physical port address or a virtual memory address... -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
