According to specs, the PCI bus in the G4s can do 64-bit transfers, at least for DMA transfers. GCC and the include files on OS X have the "long long" data type, which is 64-bits. However, one of our hardware designers said that when he tested 64-bit IO from the processor to the device on the PCI bus, that the high-order bits were all cleared and data was only in the bottom long. I am wondering if it is indeed the case that CPU <--> PCI bus transfers are limited to 4 bytes, or if we're overlooking something. Is anyone doing 64-bit CPU <--> PCI transfers? Thanks! -Michael _______________________________________________ darwin-kernel mailing list | darwin-kernel@lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.