Date: Fri, 11 Aug 2000 10:32:36 +0100 (IST) From: "Steve O'Hara-Smith" <steveo@eircom.net> To: freebsd-stable@freebsd.org Cc: sos@freebsd.org Subject: SiS 5595 - can do UDMA-66. patch for test. Message-ID: <XFMail.000811103236.steveo@eircom.net>
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Hi,
I have a box with a SiS 5595 which is recognised as a 5591. As far as I
can tell the only difference is that 5595 does UDMA66. The (very simple)
patch below trys for UDMA66 on a 5591 and (with mine at least) gets it (the
improvement is not subtle). The patch is against -stable a while ago, I've been
soaking it ever since.
Index: dev/ata/ata-dma.c
===================================================================
RCS file: /home/ncvs/src/sys/dev/ata/ata-dma.c,v
retrieving revision 1.35.2.2
diff -u -r1.35.2.2 ata-dma.c
--- dev/ata/ata-dma.c 2000/06/11 17:02:46 1.35.2.2
+++ dev/ata/ata-dma.c 2000/08/01 21:25:32
@@ -377,6 +377,19 @@
break;
case 0x55131039: /* SiS 5591 */
+ if (udmamode >= 4) {
+ error = ata_command(scp, device, ATA_C_SETFEATURES, 0, 0, 0,
+ ATA_UDMA4, ATA_C_F_SETXFER, ATA_WAIT_READY);
+ if (bootverbose)
+ ata_printf(scp, device,
+ "%s setting up UDMA4 mode on SiS chip\n",
+ (error) ? "failed" : "success");
+ if (!error) {
+ pci_write_config(parent, 0x40 + (devno << 1), 0xa301, 2);
+ scp->mode[ATA_DEV(device)] = ATA_UDMA4;
+ return;
+ }
+ }
if (udmamode >= 2) {
error = ata_command(scp, device, ATA_C_SETFEATURES, 0, 0, 0,
ATA_UDMA2, ATA_C_F_SETXFER, ATA_WAIT_READY);
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