Re: 6.0-current panic: loading radeon module

From: John Baldwin (jhb_at_FreeBSD.org)
Date: 06/27/05

  • Next message: John Baldwin: "Re: Patch for sysinstall wrong-disc problem" 
    To: freebsd-current@freebsd.org
Date: Mon, 27 Jun 2005 16:47:32 -0400

    On Sunday 26 June 2005 03:17 pm, Eric Anholt wrote:
    > On Sun, 2005-06-26 at 12:57 -0600, M. Warner Losh wrote:
    > > In message: <1119809673.3817.3.camel@leguin>
    > >
    > > Eric Anholt <eta@lclark.edu> writes:
    > > : On Fri, 2005-06-24 at 19:59 -0400, Martin Cracauer wrote:
    > > : > > I'd forgotten about this thread. I've got a proposed fix for this
    > > : > > at: http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/80718
    > > : >
    > > : > I get the same panic and backtrace with that patch (on a 32 MB
    > > : > moobile Radeon 7500).
    > > : >
    > > : > I will annotate the sourcecode now to verify (or not) the NULLs in
    > > : > the arguments for the bus argument.
    > > :
    > > : Thanks for showing that that patch didn't work. I should have
    > > : remembered why it wouldn't. The next step would be to try a
    > > : workaround: Comment out the two calls to drm_initmap() in radeon_cp.c.
    > > :
    > > : We really need a nice call to grab the start/offset of a pci resource
    > > : given the rid. We can avoid it now, but we might not be able to given
    > > : where the DRM is headed.
    > >
    > > rman_get_start() doesn't do the trick? Or do you need to know what it
    > > is before the bus_alloc_resource? If so, you can call
    > > bus_get_resource(). What is it that you need to know?
    >
    > bus_alloc_resource tries to map the 128+ MB framebuffer and pmap_mapdev
    > falls over. I'll take a look at bus_get_resource now.

    Try doing it without RF_ACTIVE. The problem there is that we really just want
    to allocate the resource so the backing physical addresses are reserved, but
    we don't want to actually map that into KVA. 

    -- 
John Baldwin <jhb@FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org
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