.\" This manpage has been automatically generated by docbook2man 
.\" from a DocBook document.  This tool can be found at:
.\" <http://shell.ipoline.com/~elmert/comp/docbook2X/> 
.\" Please send any bug reports, improvements, comments, patches, 
.\" etc. to Steve Cheng <steve@ggi-project.org>.
.TH "ATA_PIO_DEVCHK" "9" "09 October 2005" "" ""

.SH NAME
ata_pio_devchk \- PATA device presence detection
.SH SYNOPSIS
"SYNOPSIS"
.sp
\fB
.sp
unsigned int ata_pio_devchk  (struct ata_port * \fIap\fB, unsigned int \fIdevice\fB);
\fR
.SH "ARGUMENTS"
.TP
\fB\fIap\fB\fR
ATA channel to examine
.TP
\fB\fIdevice\fB\fR
Device to examine (starting at zero)
.SH "DESCRIPTION"
.PP
This technique was originally described in
Hale Landis's ATADRVR (www.ata-atapi.com), and
later found its way into the ATA/ATAPI spec.
.PP
Write a pattern to the ATA shadow registers,
and if a device is present, it will respond by
correctly storing and echoing back the
ATA shadow register contents.
.SH "LOCKING"
.PP
caller.