How to change PCI Configuration space?

How to change PCI Configuration space?

[Rajat Jain]

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
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Re: [Pcihpd-discuss] How to change PCI Configuration space?

[Matthew Wilcox]

On Tue, Aug 30, 2005 at 01:47:12PM +0900, Rajat Jain wrote:
> 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.

Don't use pcitweak.  Use setpci instead.

-- 
"Next the statesmen will invent cheap lies, putting the blame upon 
the nation that is attacked, and every man will be glad of those
conscience-soothing falsities, and will diligently study them, and refuse
to examine any refutations of them; and thus he will by and by convince 
himself that the war is just, and will thank God for the better sleep 
he enjoys after this process of grotesque self-deception." -- Mark Twain
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Re: How to change PCI Configuration space?

[chuck gelm]

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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Re: How to change PCI Configuration space?

[Rajat Jain]

On 8/31/05, chuck gelm <chuck@gelm.net> wrote:
> 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."
> 


Un ... I'm sorry ... I put that "$" prompt manually here in this mail.
I AM the root and working on the "#" prompt. I would appreciate if
somebody can tell me any other commands than "pcitweak" and "setpci"
to change PCI configuration space.

Thanks & Regards,

Rajat Jain
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Re: How to change PCI Configuration space?

[chuck gelm]

Rajat Jain wrote:
> On 8/31/05, chuck gelm <chuck@gelm.net> wrote:
> 
>>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 '$' prompt in your console indicates 'user' privileges.
>>My 'root' prompt is a '#'.
>>I suggest that you do not have 'root' privileges when
>>executing  a '-w' (write) command.
>>
>>HTH, Chuck
>>
>>"Pcitweak  is  a  utility  that  can  be used to examine or
>> change registers in the PCI configuration space.  On  most
>> platfoms pcitweak can only be run by the root user."
>>
> 
> 
> 
> Un ... I'm sorry ... I put that "$" prompt manually here in this mail.
> I AM the root and working on the "#" prompt. I would appreciate if
> somebody can tell me any other commands than "pcitweak" and "setpci"
> to change PCI configuration space.
> 
> Thanks & Regards,
> 
> Rajat Jain

Hi, Rajat Jain:

  Sorry, I cannot help.  Just for fun, I used pcitweak, scanpci, lspci,
and 'cat /proc/pci' and looked at my two rtl8139 ethernet cards.  I
think I found that they have 256 bytes of memory; one card uses memory
0x3e014000 - 0x3e140ff or 0x100 bytes.
(cat /proc/pci |grep -A 1 -B 4 ealtek)

  pcitweak read 32 bits (4 bytes) so
pcitweak 0:9:0 -r 0
  would show bytes offset 0, 1, 2, & 3.

pcitweak 0:9:0 -r[-w] 64 [value]
  would read[write] bytes offset 64, 65, 66, 67
  or 0x100, 0x101, 0x102, 0x103
  which is undefined.  There might be no RAM memory at byte offset 64.

  I also used pcitweak 0:9:0 -r 4096, which I assume is outside the
configuration space of my pci device, but pcitweak dutifully displayed
output.  :-|

Hopefully you are not writing to ROM. :-|

Good luck,
Chuck


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Re: How to change PCI Configuration space?

[chuck gelm]

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
(This response is limited to linux-newbie, although
there should be a better list-server for this depth of a problem.)

Hi, Rajat Jain:

  Sorry, I cannot help.  Just for fun, I used pcitweak, scanpci, lspci,
and 'cat /proc/pci' and looked at my two rtl8139 ethernet cards.  I
think I found that they have 256 bytes of memory; one card uses memory
0x3e014000 - 0x3e140ff or 0x100 bytes.
(cat /proc/pci |grep -A 1 -B 4 ealtek)

  pcitweak read 32 bits (4 bytes) so
pcitweak 0:9:0 -r 0
  would show bytes offset 0, 1, 2, & 3.

pcitweak 0:9:0 -r[-w] 64 [value]
  would read[write] bytes offset 64, 65, 66, 67
  or 0x100, 0x101, 0x102, 0x103
  which is undefined.  There might be no memory at byte offset 64.

  I also used pcitweak 0:9:0 -r 4096, which I assume is outside the
configuration space of my pci device, but pcitweak dutifully displayed
output.  :-|

Hopefully you are not writing to ROM. :-|

Good luck,
Chuck

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