Re: How to change PCI Configuration space?

[chuck gelm <chuck@gelm.net>]

Rajat Jain wrote:
> Hi List,
> 
> I want to change the PCI Configuration space of a particular device in
> my system. I am trying to use the "pcitweak" utility to do so, but am
> not suceeding. I would appreciate if some body could provide me any
> pointers in how to do so.
> 
> In this case, I want to change the value at offset 64:
> 
> $ pcitweak -r 5:9:1 64
> 0x01000001                 //original value
> 
> $ pcitweak -w 5:9:1 64 0x02000002      //new value
> 
> $ pcitweak -r 5:9:1 64
> 0x01000001                //no change?
> 
> TIA,
> 
> Rajat Jain

Dear Rajat Jain:

  'man pcitweak' indicates that it requires root privileges.
the '$' prompt in your console indicates 'user' privileges.
My 'root' prompt is a '#'.
I suggest that you do not have 'root' privileges when
executing  a '-w' (write) command.

HTH, Chuck

"Pcitweak  is  a  utility  that  can  be used to examine or
  change registers in the PCI configuration space.  On  most
  platfoms pcitweak can only be run by the root user."
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