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Re: kern/37884: nvidia ehci umass

The following reply was made to PR kern/37884; it has been noted by GNATS.

From: Martin Husemann <>
To: Izumi Tsutsui <>
Subject: Re: kern/37884: nvidia ehci umass
Date: Sun, 27 Jan 2008 18:04:01 +0100

 On Mon, Jan 28, 2008 at 01:43:46AM +0900, Izumi Tsutsui wrote:
 > According to Microsoft KB925528, NVIDIA echi seems to have a bug
 > which can't do DMA against memory higher than 2G physicall address.
 Oh, great, that would explain it.
 > Maybe we could handle the quirk by MI bus_dmatag_subregion(9)
 > like if_bce.c, but the next problem is that ehci(4) driver
 > completely lacks bus_dmamap_sync(9) calls, as noted in
 > sys/dev/usb/TODO.
 Yes, that sounds like the way to go. I have an affected machine but won't
 come around to it within the next few weeks, so everyone is invited to
 beat me to this.

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