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Old 08-08-02, 09:53 AM   #1
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Unhappy 'Can't map registers' at kernel driver init

Hello all

I just upgraded my kernel from 2.2.20 to 2.4.19 and when trying to use NVDIA_kernel-2960, at startup of nvidia driver, the kernel module fails with the message:

nvidia: couldn't map registers!
NV0: nv_map_device failed

Please I need a clue to fix it ?
Note that with 2.2 the nvidia driver was running perfectly ...

thanks for any help !!!!
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Old 08-08-02, 10:13 AM   #2
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Lightbulb Looked at the code

Actually the message is clear and after a look at the code I think I have a clue about what is going on.
My 2.4 kernel have been builded with the rivafb frame buffered console driver.
The register set for the video controler have already been mapped by this driver (BAR0 & 1: for control regs and FB regs).
These reg sets might also be reserved by nvidia_kernel driver.

Does this make sense ?
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Old 08-08-02, 10:30 AM   #3
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Thumbs up Fixed

It seems to be why the nvidia kernel module was not loading correctly.

Would it be possible to merge both driver ? or at least to get mapped & bus addresses from rivafb driver ? (just a silly idea)
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Old 08-08-02, 10:37 AM   #4
Join Date: Jul 2002
Location: Netherlands, Europe
Posts: 2,105

One thing: NEVER EVER USE RIVAFB. It is very, very buggy. It causes various problems in X (drawing ones for example) and it causes VT switching problems and instability. If you want a framebuffer use vesafb.
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Old 08-08-02, 02:15 PM   #5
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Thanks for the trick
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