Re: kern/37884: nvidia ehci umass

[Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>]

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

From: Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>
To: jmcneill%invisible.ca@localhost
Cc: gnats-bugs%NetBSD.org@localhost, kern-bug-people%NetBSD.org@localhost, 
gnats-admin%NetBSD.org@localhost,
        netbsd-bugs%NetBSD.org@localhost, tsutsui%ceres.dti.ne.jp@localhost
Subject: Re: kern/37884: nvidia ehci umass
Date: Mon, 28 Jan 2008 01:43:46 +0900

 jmcneill%invisible.ca@localhost wrote:
 
 > > System: NetBSD wormulon.kollasch.net 4.99.31 NetBSD 4.99.31 (WORMULON) 
 > > #27: Sat Jan 5 20:17:13 UTC 2008 
 > > root%wormulon.kollasch.net@localhost:/usr/src/sys/arch/amd64/compile/WORMULON
 > >  amd64
 > 
 > This is quite an old kernel. Can you please confirm that the issue is 
 > still present with a 4.99.50 kernel?
 
 Yes, the recent kernel still has the problem.
 
 According to Microsoft KB925528, NVIDIA echi seems to have a bug
 which can't do DMA against memory higher than 2G physicall address.
 
 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.
 
 Any takers?
 ---
 Izumi Tsutsui