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    SubjectRe: [PATCH 2.6.34] ehci-hcd: add option to enable 64-bit DMA support
    On Tue, Feb 23, 2010 at 12:48 AM, Yuhong Bao <> wrote:
    >> According to one Microsoft page I saw, Windows XP did not implement
    >> the 64-bit addressing feature in EHCI. I haven't found any information
    >> on whether any newer Windows versions do or not.
    > Windows 7 seems to support it, and it seems like they have to already do a workaround for broken NVIDIA chipsets:

    That's good news actually.. it means they've apparently already
    debugged the feature for us :-) I suppose the next step would be to
    contact NVIDIA and see what they say (i.e. which particular chipsets
    have the problem), but from my experience with them, requests of the
    form "can you confirm X is a bug in your chipset" to those guys seem
    to go into the bit bucket. Does anyone have any good contacts at
    NVIDIA for USB or other chipset issues? I see there's some existing
    NVIDIA-specific EHCI quirks so I'm assuming someone was in contact
    with them before..

    The fact that Windows 7 is now using the feature also means that there
    aren't likely to be too many machines where the 64-bit addressing is
    reported but doesn't work. Which means that aside from the NVIDIA
    quirk, I think enabling 64-bit addressing should be relatively safe.

     \ /
      Last update: 2010-02-24 01:29    [W:0.019 / U:0.512 seconds]
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