[MPlayer-matrox] Compile probs: mga_vid on 2.6.10-1.771_FC2

[Barton Bosch]

I don't have much experience compiling software from source so I'm
probably just missing something obvious, please bear with me.  The
system specs are FC2, 2.6.10-1.771 (official kernel rpm), matrox G450.

I just compiled mplayer CVS for the first time and am trying to get
mga_vid together, with some limited success.  So far I've tried
these versions:

mga_vid-2.6.10-2005-01-11.tar.gz
mga_vid-2.6.11-2005-03-06.tar.gz


The first does not compile smoothly:

[root at depijp mga-vid-2.6.10]# make mga_vid.ko mga_vid_test
make -C /lib/modules/`uname -r`/build
SUBDIRS=/usr/local/src/mga-vid-2.6.10 modules
make[1]: Entering directory `/lib/modules/2.6.10-1.771_FC2/build'
   CC [M]  /usr/local/src/mga-vid-2.6.10/mga_vid.o
In file included from include/asm/processor.h:18,
                  from include/asm/thread_info.h:17,
                  from include/linux/thread_info.h:21,
                  from include/linux/spinlock.h:12,
                  from include/linux/capability.h:45,
                  from include/linux/sched.h:7,
                  from include/linux/module.h:10,
                  from /usr/local/src/mga-vid-2.6.10/mga_vid.c:48:
include/asm/system.h: In function `__set_64bit_var':
include/asm/system.h:193: warning: dereferencing type-punned pointer
will break strict-aliasing rules
include/asm/system.h:193: warning: dereferencing type-punned pointer
will break strict-aliasing rules
In file included from /usr/local/src/mga-vid-2.6.10/mga_vid.c:52:
include/linux/cdev.h: At top level:
include/linux/cdev.h:24: warning: `struct inode' declared inside
parameter list
include/linux/cdev.h:24: warning: its scope is only this definition
or declaration, which is probably not what you want
/usr/local/src/mga-vid-2.6.10/mga_vid.c: In function `mga_vid_mmap':
/usr/local/src/mga-vid-2.6.10/mga_vid.c:952: warning:
`remap_page_range' is deprecated (declared at include/linux/mm.h:778)
   Building modules, stage 2.
   MODPOST
   CC      /usr/local/src/mga-vid-2.6.10/mga_vid.mod.o
   LD [M]  /usr/local/src/mga-vid-2.6.10/mga_vid.ko
make[1]: Leaving directory `/lib/modules/2.6.10-1.771_FC2/build'
make: *** No rule to make target `mga_vid_test.c', needed by
`mga_vid_test'.  Stop.


and then trying to modprobe it results in:

[root at depijp mga-vid-2.6.10]# modprobe mga_vid
FATAL: Error inserting mga_vid
(/lib/modules/2.6.10-1.771_FC2/misc/mga_vid.ko): Bad address


The second compiles but appears to install the module in the wrong
directory (/lib/modules/2.6.10-1.771_FC2/extra/mga_vid.ko instead of
/lib/modules/2.6.10-1.771_FC2/misc/mga_vid.ko) which causes modprobe
to be unable to find it.  Fortunately moving it to modprobe's
expected directory fixes things.

I probably wouldn't have posted except for the fact that I only
figured this out as I was double checking my procedure while writing
this email, heh.  In the process of trying to get this together I
encountered difficulty connecting to http://attila.kinali.ch/mga/ so
I tried  a version that someone on the list posted,
http://flashdance.cx/tmp/mga-vid-2.6.11-2005-03-06.tar.gz (I think).

Running diff on it shows it to be exactly the same as the
http://attila.kinali.ch/mga/ sources I was able to get this morning
but the results were not...  Previously the mga_vid.ko module would
not load if modprobed, but would load and run if insmod was pointed
to its fully qualified location.  So I took a step back, decided to
try to compile a 2.6.10 mga_vid module which was when I found that I
could connect to http://attila.kinali.ch/mga/, wrote this email and
managed to get the 2.6.11 module working.

The only other factors that changed (to my knowledge) were that the
first time I compiled mga_vid (the flashdance version, oh what a
feeling <g>) I had yet to compile mplayer or install an mplayer rpm
on this partition.  Also ldconfig was run a couple of times
subsequent to the initial mga_vid compile, thinking that it might
solve modprobe's problems.  Other than that everything's pretty much
the same.

Anyway, mystery solved and I thought you'd want to know about the
FC2 mga_vid installation directory issue and that the other info
might possibly be helpful.


Thanks,

Barton
-- 
Between falsehood and useless truth there is little difference. As 
gold which he cannot spend will make no man rich, so knowledge which 
he cannot apply will make no man wise.  -- Samuel Johnson, 
(1709-1784) English writer