Geode lxfb framebuffer not working

Kushal Koolwal kushalkoolwal at hotmail.com
Thu Jun 12 19:53:54 EDT 2008


> So at this point, you are going to have to start instrumenting code.  
> We are interested in figuring out which path the code goes down in
> lx_framebuffer_size() in drivers/video/geode/lxfb_ops.c.
> We are further interested in what happens in geode_has_vsa2() in
> arch/x86/kernel/geode_32.c.  In particular, the value that is returned
> by the inw(VSA_VRC_DATA).

I am not an expert kernel hacker but if you give me some idea as to what statements to put (like printk) in those code files(lxfb_ops.c and geode_32.c) I can probably do that,compile, run and send you the outputs.

Please do let me know. Sorry for being unfamiliar with Kernel Debugging. This is a learning phase for me.
 
Kushal Koolwal

I do blog at http://blogs.koolwal.net/



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> Date: Thu, 12 Jun 2008 17:34:52 -0600
> From: jordan.crouse at amd.com
> To: kushalkoolwal at hotmail.com
> CC: mart.raudsepp at artecdesign.ee; linux-geode at bombadil.infradead.org
> Subject: Re: Geode lxfb framebuffer not working
> 
> On 12/06/08 15:28 -0700, Kushal Koolwal wrote:
> > >It sounds like your BIOS is horribly misconfigured.
> > That might be true however the same configuration (BIOS and Hardware) works fine on a 2.6.22 kernel.
> > Also the problem of "/dev/fb0 not present" kicked in when I used the GIT kernel (2.6.26-rc5 release). 
> > If I use the stable 2.6.25 from kernel.org, I do get those green lines (during boot) and the device /dev/fb0 is present.
> 
> Its all the same problem.
> 
> So at this point, you are going to have to start instrumenting code.  
> We are interested in figuring out which path the code goes down in
> lx_framebuffer_size() in drivers/video/geode/lxfb_ops.c.
> 
> We are further interested in what happens in geode_has_vsa2() in
> arch/x86/kernel/geode_32.c.  In particular, the value that is returned
> by the inw(VSA_VRC_DATA). 
> 
> If we know these two things ,then I can formulate an opinion, but I don't
> have a GSW system nearby to test.
> 
> Jordan
> 
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