Re: How to change PCI Configuration space?

chuck gelm
2005-08-30T16:22:26Z

> 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."