Re: 6.0-current panic: loading radeon module

On Sun, 2005-06-26 at 12:57 -0600, M. Warner Losh wrote:
> In message: <1119809673.3817.3.camel_at_leguin>
>             Eric Anholt <eta_at_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.

-- 
Eric Anholt                                     eta_at_lclark.edu
http://people.freebsd.org/~anholt/              anholt_at_FreeBSD.org