[Xorg-driver-geode] Geode LX video testing results
Brunner, Brian T.
BBrunner at gai-tronics.com
Fri Dec 14 05:55:36 PST 2007
Hello
I did not subscribe to this list, but got "auto-subscribed".
I am not pleased at the presumption.
I attempted to unsubscribe, but no success.
Somebody else gets to unsubscribe me, as I will auto-respond to this
list.
(auto-subscribe isn't rude? Neither is auto-respond)
> -----Original Message-----
> From: xorg-driver-geode-bounces at lists.x.org
> [mailto:xorg-driver-geode-bounces at lists.x.org] On Behalf Of
> Jordan Crouse
> Sent: Thursday, December 13, 2007 10:22 PM
> To: Bart Trojanowski
> Cc: xorg-driver-geode at lists.x.org
> Subject: Re: [Xorg-driver-geode] Geode LX video testing results
>
> On 13/12/07 22:07 -0500, Bart Trojanowski wrote:
> > * Bart Trojanowski <bart at jukie.net> [071213 17:26]:
> > > > What that function tries to do is map the VGA space and
> look for a
> > > > VGA signature (which won't be there on LinuxBIOS
> implementations),
> > > > and then behaves accordingly. Apparently its not
> working on some
> > > > BIOSes, but is working on others, which leads me to
> believe that
> > > > this might be a memory problem somewhere along the line.
> > >
> > > The log is pretty useless when it comes to the freeze case. I'll
> > > try to get you better information as to where the code
> actually freezes.
> >
> > I was getting problem running gdbserver with X. SIGTRAP errors.
> > I said I wasn't an X developer... indeed I am from the
> kernel world,
> > so as a result I am really really good at printk() debugging :)
> >
> > So using what I know, I wrote some code to send a TCP log messages
> > with TCP_NODELAY and for good measure an fsync() after each
> message.
> > Then I sprinkled log messages printing the __LINE__ number all over
> > LXPreInit(). Barbaric, I know.
>
> printk/printf is the only way to debug - even X developers
> know that (and honestly, I'm not a X developer either - this
> is low level, _almost_ in the kernel development. X
> developers are guys that do things with GUIs. I don't do GUIs.. :)).
>
> In the future, ErrorF is your friend. But yours sounds like
> a fun hack.
>
> > Anyway, I am using the patched version. And I didn't put in my
> > useVGA=FALSE hack as I wanted it to freeze.
> >
> > Running X -configure I get a freeze inside the call to
> >
> > GeodeProbeDDC(pScrni, pEnt->index);
>
> This is on the Thincan? If so, then I'm confused - I thought
> the thincan didn't have a VGA BIOS, and the _only_ way we're
> getting into that function is if LXCheckVGA returns TRUE.
>
> But, lets pretend that for as of yet unexplained behavior,
> somehow the CheckVGA function is returning true. So then, we
> assume that VGA is there, and we merrily go off and and try
> to get the DDC information, which we know will blow up
> because the Thincan doesn't have the DDC pins enabled, but
> rather the second serial port.
>
> This is badness, but there really isn't anything that the
> driver can do in this situation - at some point, we have to
> make certain assumptions.
> The assumption that DDC will at least not blow up if VGA is
> present is an assumption that I can feel good about.
>
> DDC may also be blowing up on General Software, but probably
> for other reasons then the pins being muxed.
>
> The third option is that we just plain screwed up the DDC
> function - I'll compare to Intel and verify.
>
> Jordan
>
>
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>
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