Peter Hurley wrote: > On Fri, 2013-03-29 at 11:44 +0100, Stefan Richter wrote: >>> On Mar 26 Peter Hurley wrote: >>>> The FW643e-2 is natively PCIe (not behind a bridge) and supports phys >>>> DMA past 4GB (the datasheet says all 48 bits but I can only test it out >>>> to 10GB). >>>> >>>> I thought the FW643e was as well? You'll have to test that out :) >> >> Does lspci or something similar show which PCI devices are capable of 64 bit >> wide addressing? > > Not definitively. > > Usually (but not always), if the host registers are 64-bit addressable, > then the device supports DAC.
DACs are a feature of conventional PCI. All PCI Express devices are 64-bit addressable. In the lspci output, PCIe devices have the "Express" capability. However, whether a device can *generate* 64-bit DMA requests is completely device-specific. Regards, Clemens -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
