Date: Tue, 05 Oct 2004 18:20:13 +0200 From: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@DeepCore.dk> To: Roman Kennke <roman@ontographics.com> Cc: freebsd-current@freebsd.org Subject: Re: nearly-lockup at boot with DMA enabled on DVD-drive Message-ID: <4162C9BD.8060303@DeepCore.dk> In-Reply-To: <1096906618.695.7.camel@moonlight> References: <1096906618.695.7.camel@moonlight>
next in thread | previous in thread | raw e-mail | index | archive | help
Roman Kennke wrote: > Hi list, >=20 > I am trying out the very latest BETA7 on my Fujitsu Amilo A laptop. I a= m > experiencing problems with DMA on my DVD drive. I remember that with > 5.2.1 and IMO also with BETA4 the DVD drive acd0 was set to PIO4. That > was ok, because DMA would not work properly when forced (although DMA i= s > supported by the DVD drive and the motherbord). > Now with BETA7 (and BETA6 which I tried before) the drive is set to > DMA33, which apparently does not work ok. This leads to an extremely > long pause at boot time. I first thought this will lock up, but after > several (5-7!) minutes, the boot proceeds (with the DVD drive not > working :-( ). When I manually disable DMA in loader.conf everything is= > ok. I would really like to have DMA working (good solution) OR detected= > as PIO4 (bad solution) in FreeBSD-stable. Well, it was decided to use DMA as default when the drive says it can at = least UDMA33, so thats why it changed. Now as to why ATAPI DMA doesn't work for you I have no easy answer, it=20 can be chipset, device firmware, ATA driver or any combination of those. = Did it ever work in DMA mode under FreeBSD ? The Acer chip should be DMA capable but we might need to twiddle a few=20 config bits to make it work, I'll look at it when I get the time, if too = long passes please ping me again ... -S=F8ren
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4162C9BD.8060303>