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Document that misaligned transfers will be done with PIO rather than DMA.

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fair 2005-07-06 06:36:10 +00:00
parent 527d62e0a2
commit 5b701efaa2
1 changed files with 13 additions and 2 deletions
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15
share/man/man4/geodeide.4
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@ -1,4 +1,4 @@
.\" $NetBSD: geodeide.4,v 1.3 2005/06/26 01:50:52 fair Exp $
.\" $NetBSD: geodeide.4,v 1.4 2005/07/06 06:36:10 fair Exp $
.\"
.\" Copyright (c) 2004 Manuel Bouyer.
.\"
@ -27,7 +27,7 @@
.\" INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd June 25, 2005
.Dd July 5, 2005
.Dt GEODEIDE 4
.Os
.Sh NAME
@ -95,3 +95,14 @@ on any other alignment will crash the system.
This problem may also exist in the SC1100 since the CS5530 was its
direct predecessor, and it is not clear that National Semiconductor
fixed any bugs in it.
.Pp
The
.Nm
driver will reject attempts to
.Tn DMA
to buffers not aligned to the required boundary.
The
.Xr wd 4
disk driver will back off to
.Tn PIO
mode to accomplish these transfer requests, at reduced system performance.