Bug 123546 - Missing necessary kernel modules? fbgen.o
Missing necessary kernel modules? fbgen.o
Status: CLOSED NOTABUG
Product: Red Hat Enterprise Linux 3
Classification: Red Hat
Component: kernel (Show other bugs)
3.0
i386 Linux
medium Severity medium
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Assigned To: Arjan van de Ven
Brian Brock
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Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 2004-05-19 05:36 EDT by Edward Grace
Modified: 2007-11-30 17:07 EST (History)
2 users (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Environment:
Last Closed: 2004-05-19 07:26:14 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Edward Grace 2004-05-19 05:36:40 EDT
From Bugzilla Helper:
User-Agent: Mozilla/4.78 [en] (X11; U; HP-UX B.11.00 9000/785)

Description of problem:
It appears as though some common kernel modules (notably fbgen.o) are
missing from the default 2.4.21-9.EL and 2.4.21-15.EL kernels.

As a result of this inserting a third party driver module (viafb.o)
fails since it expects many of the symbols in fbgen.o to be present.

fbgen.o is present on my RH8 box under

/lib/modules/2.4.20-28.8/kernel/drivers/video/fbgen.o

for which things compile and resolve happily (though I cannot insert
the module since I don't have a via display).  Under the EL kernel the
"cupboard is bare", very few modules are there

ls /lib/modules/2.4.21-15.EL/kernel/drivers/video/
fbcon-vga-planes.o  intel  vga16fb.o

However, under the kernel-source for the 2.4.21-15.EL kernel the
driver source code does appear to be present.

ls /usr/src/linux-2.4.21-15.EL/drivers/video/fbgen.c
/usr/src/linux-2.4.21-15.EL/drivers/video/fbgen.c

Presumably you havn't "forgotten" to compile the fbgen.o module in the
kernel release.  I imagine it is not there for good reason.  I would
like to know why it isn't there and the best way of compiling it so I
don't go and break the up2date mechanism.  

Version-Release number of selected component (if applicable):
kernel-2.4.21-15.EL
kernel-source-2.4.21-15.EL

How reproducible:
Always

Steps to Reproduce:
1. Download the Via driver from
http://downloads.viaarena.com/drivers/video/LinuxUniChrome/Linux_FBDev20040311.zip
2. unzip
3. make
4. as root make install
5. depmod -a for good measure
6. modprobe viafb
    

Actual Results:  modprobe viafb
/lib/modules/2.4.21-15.EL/kernel/drivers/video/viafb.o: unresolved
symbol fbgen_get_fix_Rf49afcda
/lib/modules/2.4.21-15.EL/kernel/drivers/video/viafb.o: unresolved
symbol fbgen_set_var_Re45df3fa
/lib/modules/2.4.21-15.EL/kernel/drivers/video/viafb.o: unresolved
symbol fbgen_set_cmap_Re1cd309c
/lib/modules/2.4.21-15.EL/kernel/drivers/video/viafb.o: unresolved
symbol fbgen_update_var_R2a35b499
/lib/modules/2.4.21-15.EL/kernel/drivers/video/viafb.o: unresolved
symbol fbgen_set_disp_R0240245b
/lib/modules/2.4.21-15.EL/kernel/drivers/video/viafb.o: unresolved
symbol fbgen_switch_R8a3ae91b
/lib/modules/2.4.21-15.EL/kernel/drivers/video/viafb.o: unresolved
symbol fbgen_get_var_R95c78eae
/lib/modules/2.4.21-15.EL/kernel/drivers/video/viafb.o: unresolved
symbol fbgen_blank_Ra9198ecf
/lib/modules/2.4.21-15.EL/kernel/drivers/video/viafb.o: unresolved
symbol fbgen_pan_display_R7f2ff96e
/lib/modules/2.4.21-15.EL/kernel/drivers/video/viafb.o: unresolved
symbol fbgen_get_cmap_R0f0bd4bd
/lib/modules/2.4.21-15.EL/kernel/drivers/video/viafb.o: insmod
/lib/modules/2.4.21-15.EL/kernel/drivers/video/viafb.o failed
/lib/modules/2.4.21-15.EL/kernel/drivers/video/viafb.o: insmod viafb
failed


Expected Results:  The module should be happily inserted....

Additional info:

The undefined symbols in viafb.o appear to belong to fbgen.o.  On my
RH8 box which has fbgen.o dumping the symbol information yields:

nm /lib/modules/2.4.20-28.8/kernel/drivers/video/fbgen.o | egrep " fbgen_"
000007bc T fbgen_blank_R10acb57c
000004dc T fbgen_do_set_var_R42d82c0c
000002b8 T fbgen_get_cmap_Re5c7df1e
00000000 T fbgen_get_fix_R6b4690df
0000007c T fbgen_get_var_R6642422d
00000698 T fbgen_install_cmap_Rd97bc3de
00000414 T fbgen_pan_display_R4d3cf1dc
00000350 T fbgen_set_cmap_R5a6dee09
00000558 T fbgen_set_disp_R2791dfa9
000000ec T fbgen_set_var_R8f75ba23
00000748 T fbgen_switch_Rbbfe95d3
0000070c T fbgen_update_var_Rb8eabdca
Comment 1 Rik van Riel 2004-05-19 07:26:14 EDT
In RHEL3 fbgen.o isn't a supported driver.  However, it is present in
the kernel-unsupported RPM.

If you want fbgen, please install kernel-unsupported.

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