how to read and write device registers Post: 94807

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how to read or write device files

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LEARN ABOUT XFREE86

pcitweak

PCITWEAK(1)						      General Commands Manual						       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 platforms 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  location  (bus:device:function),  chip
	       vendor/device, card (subsystem) vendor/card, revision, class and header type.  All values printed are in hexadecimal.

       -r PCI-ID
	       Read  the PCI configuration space register 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 hexadecimal.  By default, a 32-bit register is read.

       -w PCI-ID
	       Write value to the PCI configuration space register 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 hexadecimal.  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 4.7.0						       PCITWEAK(1)

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

how to read or write device files

Discussion started by: sriram.ec

2. UNIX for Dummies Questions & Answers

cat: write error: No space left on device

Discussion started by: igandu

3. Shell Programming and Scripting

Find all files with group read OR group write OR user write permission

Discussion started by: shunter63

4. IP Networking

read/write,write/write lock with smbclient fails

Discussion started by: swatidas11