Date: Mon, 28 May 2007 09:04:46 +0200 From: Hans Petter Selasky <hselasky@c2i.net> To: Julian Elischer <julian@elischer.org> Cc: freebsd-usb@freebsd.org Subject: Re: 31st address line sometimes not used on EHCI/UHCI/OHCI Message-ID: <200705280904.46850.hselasky@c2i.net> In-Reply-To: <465A7E4A.10209@elischer.org> References: <200705272235.46048.hselasky@c2i.net> <200705280853.18551.hselasky@c2i.net> <465A7E4A.10209@elischer.org>
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On Monday 28 May 2007 09:01, Julian Elischer wrote: > Hans Petter Selasky wrote: > > On Sunday 27 May 2007 23:53, John-Mark Gurney wrote: > >> Hans Petter Selasky wrote this message on Sun, May 27, 2007 at 22:35 +0200: > >>> I've got some reports back that some USB host controllers do not > >>> support transferring memory from a location higher than 2GB. > >>> > >>> What should we do about this? > >>> > >>> Should we limit all USB DMA allocations to the lower 2GB of the memory? > >> > >> No, a quirk table should be setup and pass the restriction to bus_dma > >> at tag initalization time when a broken controller is detected.. > > > > Yes, I can do that. But I am also thinking about a static quirk, like a > > sysctl you can set at boot time. > > > > I hope that this is not a wide-spread problem. > > What manufacturers are we talking about here? and is there any possibility > that it's not the USB chipset, but rather, some feature of an intermediary > bus? Yes, that might be possible. I have asked the person that found the problem to send me his output from "pciconf -l -v". I will forward it to the USB list for discussion. --HPS
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