Date: Tue, 21 Oct 2008 15:09:53 -0400 From: John Baldwin <jhb@freebsd.org> To: Jeremy Chadwick <koitsu@freebsd.org> Cc: robert@webtent.com, FreeBSD <freebsd-questions@freebsd.org> Subject: Re: page fault while in kernel mode Message-ID: <200810211509.53454.jhb@freebsd.org> In-Reply-To: <20081021184711.GA37448@icarus.home.lan> References: <1224445801.6926.0.camel@laptop.webtent.org> <1224614122.8122.62.camel@columbus.webtent.org> <20081021184711.GA37448@icarus.home.lan>
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On Tuesday 21 October 2008 02:47:11 pm Jeremy Chadwick wrote: > On Tue, Oct 21, 2008 at 02:35:22PM -0400, Robert Fitzpatrick wrote: > > On Tue, 2008-10-21 at 12:03 -0400, John Baldwin wrote: > > > Some drivers don't work with PAE (see all the 'nodevice' lines > > > in /sys/i386/conf/PAE). You'll need to purge those drivers from your > > > config. > > > If you are using the hardware those drivers support, then you can't > > > use PAE. > > > > Thanks for the help. Excuse the ignorance, I'm more a programmer than > > system guy. How do I purge a driver, or know which driver to look for, > > from the config and know what the driver supports? Do you mean, in this > > case, remove 'nodevice adv' from the PAE file? If so, I don't know what > > that supports :/ > > Yeah, I don't think anyone's really explaining this very well to you, so > I'll try a different approach: > > Certain FreeBSD drivers do not work in PAE mode. > > The drivers which don't work are listed in the /sys/i386/conf/PAE > file. They're prefixed by the word "nodevice", which tells the > kernel config reader "DO NOT build this device, because it won't > work". > > You will need to take the "nodevice" lines from /sys/i386/conf/PAE and > put them into your kernel config file. (There are alternative methods > such as using "include" directives and so on, but I'm trying to keep > this explanation simple.) > > Make sense now? :-) Alternatively, you could just remove the 'device adv' line from your kernel config rather than adding lots of 'nodevice' lines at the bottom. You can usually do 'man 4 <driver name>' to see what devices it supports. In this case, adv(4) supports mostly ancient Advansys SCSI host adapters. The manpage has a full list of the various model numbers, etc. -- John Baldwin
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