Date: Sat, 28 Nov 1998 03:51:04 -0500 (EST) From: Lee Cremeans <lcremean@tidalwave.net> To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: kern/8875: Patch to allow DMA IDE with generic chipset + UDMA drives Message-ID: <199811280851.DAA03425@st-lcremean.tidalwave.net>
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>Number: 8875
>Category: kern
>Synopsis: Patch to allow DMA IDE with generic chipset + UDMA drives
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sat Nov 28 01:00:01 PST 1998
>Last-Modified:
>Originator:
>Organization:
>Release: FreeBSD 3.0-CURRENT i386
>Environment:
Amptron PM-9600 motherboard (Acer Aladdin IV+ Socket 7 chipset)
AMD K6-2-266 processor
Seagate Medalist Pro 9140 hard drive
>Description:
Adds option NO_GENERIC_UDMA. This option lets people who have
had problems getting "generic" chipsets and UDMA hard drives
to cooperate to use their drives in multiword DMA 2 mode--a
slight tradeoff in speed, but enough to tide over until support
can be written in for the Acer and SiS UDMA chips.
>How-To-Repeat:
N/A, this is a patch
>Fix:
(The lines for the Id strings can be ignored, they're just there to show which
versions of the files I diffed against.)
--- ide_pci.c.orig Sat Nov 28 03:09:23 1998
+++ ide_pci.c Sat Nov 28 03:47:40 1998
@@ -26,7 +26,6 @@
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
- * $Id: ide_pci.c,v 1.14 1998/07/15 02:32:26 bde Exp $
*/
#include "pci.h"
@@ -267,6 +266,19 @@
printf("ide_pci: generic_dmainit %04x:%d: warning, IDE controller timing not set\n",
cookie->iobase_wd,
cookie->unit);
+#ifdef NO_GENERIC_UDMA
+ /* Be pessimistic about the controller's setup, and assume it's
+ only set for Multiword 2 DMA and not UDMA. Make the drive
+ aware of this. */
+ int r;
+
+ r = wdcmd(WDDMA_MDMA2, wdinfo);
+ if (!r) {
+ printf("generic_dmainit: setting DMA mode failed\n");
+ return 0;
+
+ }
+#endif /* NO_GENERIC_UDMA */
return 1;
}
#ifdef IDE_PCI_DEBUG
--- options.i386.orig Sat Nov 28 03:43:47 1998
+++ options.i386 Sat Nov 28 03:46:59 1998
@@ -1,4 +1,3 @@
-# $Id: options.i386,v 1.92 1998/11/15 20:08:49 eivind Exp $
DISABLE_PSE
IDE_DELAY
@@ -95,6 +94,7 @@
ATAPI_STATIC opt_atapi.h
CMD640 opt_wd.h
+NO_GENERIC_UDMA opt_wd.h
USERCONFIG opt_userconfig.h
VISUAL_USERCONFIG opt_userconfig.h
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