patch to get latest XFree 4.0 snapshot (xf3918) to workonppcwithr128

[Michael Schmitz]

> > > Doesn't hurt for probing, but maybe for the ioctl?
> >
> > The ioctl has been disabled long time ago.
>
> I meant when you hadn't disabled it. It hung there at the time, right? Now a
> hang in an ioctl is a kernel bug, or am I missing something?

No, you're right :-)

> > I'll get back to poking around in there as soon as I can figure out how to
> > see the kernel messages (i.e. how to switch back to the text console fast
> > enough, or never let the X server switch to VT 7 in the first place).
>
> A remote machine might be handy...

That's what I'm using already. But the kernel messages that otherwise
appear on the text screen won't get redirected to a remote machine.
Nothing ever ends up in the syslog, anyway. I guess the klogd/syslogd
combo is too slow in this case.

> > Now I can't get beyond xf86HandleColormaps(). Another ioctl that barfs on
> > me, perhaps.
>
> Well possible, FBIOPUTCMAP in fbdevHWLoadPalette.

Probably. I'll have to trace all these ioctls as soon as I can keep the X
server from switching consoles.

> I don't understand the code there...

The cmap only passes the pointers to the color values. fb_set_cmap does
get_user on those so it should be OK. Don't ask me why X sets each entry
separately though (on some braindead Mac video cards this means you have
to start setting the cmap from entry 0 until you hit the right one, each
time).

> BTW I've just discovered that the fbdev driver sets the weight explicitly to
> {0,0,0}... now I'm (really ;) confused.

So was I.

> > I guess it all boils down to PCI messups.
>
> How do you come to this conclusion? Why should it influence ioctls?

Because these ioctls will, ultimately, write to the card again? If the X
server actually messes with the PCI bridges, the card might no longer be
mapped?
I admit that I understand next to nothing about PCI, or how the X server
uses PCI. Makes it a bit harder to spot the flaky code :-)

Anyway, the X server appears to complete screen init OK but I never
actually get to see the cross hatch pattern.

	Michael


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