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PCITWEAK(1)					   PCITWEAK(1)

NAME
       pcitweak - read/write PCI config space

SYNOPSIS
       pcitweak -l
       pcitweak -r PCI-ID [-b|-h] offset
       pcitweak -w PCI-ID [-b|-h] offset value

DESCRIPTION
       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.

OPTIONS
       -l      Probe  the  PCI	buses  and  print a line for each
	       detected device. Each line contains the bus loca-
	       tion  (bus:device:function),  chip  vendor/device,
	       card (subsystem) vendor/card, revision, class  and
	       header  type.  All values printed are in hexadeci-
	       mal.

       -r PCI-ID
	       Read the PCI configuration space register at  off-
	       set  for the  PCI  device at bus location PCI-ID.
	       PCI-ID	should	be    given	in    the    form
	       bus:device:function,  with each value in hexadeci-
	       mal.  By default, a 32-bit register is read.

       -w PCI-ID
	       Write value to the PCI configuration space  regis-
	       ter  at	offset for the PCI device at bus location
	       PCI-ID.	PCI-ID	should	be  given  in	the  form
	       bus:device:function,  with each value in hexadeci-
	       mal.  By default, a 32-bit register is written.

       -b      Read or write an 8-bit value (byte).

       -h      Read or write a 16-bit value (halfword).

SEE ALSO
       scanpci(1)

AUTHORS
       David Dawes (dawes@xfree86.org).

XFree86			Version 4.0.2				1

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