The patch described by the following excerpt from ChangeLog-2.6.22 makes
it impossible to use UDMA on a Tyan S2707 motherboard (SvrWks CSB5):
commit 2d5eaa6dd744a641e75503232a01f52d0768884c
Author: Bartlomiej Zolnierkiewicz <bzolnier@xxxxxxxxx>
Date: Thu May 10 00:01:08 2007 +0200
ide: rework the code for selecting the best DMA transfer mode (v3)
...
This one-line patch against 2.6.23 fixes the problem.
Signed-off-by: Tony Battersby <tonyb@xxxxxxxxxxxxxxx>
---
--- linux-2.6.23/drivers/ide/pci/serverworks.c.orig 2007-10-15 12:15:01.000000000 -0400
+++ linux-2.6.23/drivers/ide/pci/serverworks.c 2007-10-15 13:47:29.000000000 -0400
@@ -97,6 +97,7 @@ static u8 svwks_udma_filter(ide_drive_t
mode = 2;
switch(mode) {
+ case 3: mask = 0x3f; break;
case 2: mask = 0x1f; break;
case 1: mask = 0x07; break;
default: mask = 0x00; break;
-
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