Kernel crash on Asus A7N8X-X

John Baldwin jhb at
Thu Mar 6 13:33:58 UTC 2008

On Tuesday 04 March 2008 05:59:59 pm Frédéric PRACA wrote:
> Hello dear hackers,
> I own a Asus A7N8X-X motherboard (NForce2 chipset) with a Radeon 9600 video
> card. After upgrading from 6.3 to 7.0, I launched xorg which crashed the
> kernel. After looking in the kernel core dump, I found that the
> agp_nvidia_flush_tlb function of /usr/src/sys/pci/agp_nvidia.c crashed on
> the line 377. The loop fails from the beginning (when i==0). I commented
> out the two last loops and it seems to work now but as I didn't understand
> what is this code for, I'd like to have some explanation about it and want
> to know if someone got the same problem.

The Linux AGP driver has the same code.  It appears to be forcing a read of 
the TLB registers to force prior writes to clear the TLB entries to flush 
perhaps?  I'm not sure why you are getting a panic.  What kind of fault did 
you get?  (The original kernel panic messages would be needed.)

John Baldwin

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