On Fri, Nov 28, 2003 at 12:16:48AM +0100, Bartlomiej Zolnierkiewicz wrote:

Can you first try booting with "ide2=autodma" kernel parameter
instead of downgrading to UDMA100?

This caused the system to boot up with DMA disabled for the relevant
drive.  (Note: that may also be how it was working before.)  Here is a
diff from the previous dmesg to this one:

--- dmesg       2003-11-27 17:51:54.000000000 -0500
+++ dmesg2      2003-11-27 21:04:14.000000000 -0500

@@ -9,9 +9,10 @@
 zone(0): 4096 pages.
 zone(1): 94208 pages.
 zone(2): 0 pages.
-Kernel command line: root=/dev/hdc1 ro rootfstype=ext3
+Kernel command line: root=/dev/hdc1 ro rootfstype=ext3 ide2=autodma
+ide_setup: ide2=autodma -- BAD OPTION
 Initializing CPU#0
-Detected 400.919 MHz processor.
+Detected 400.923 MHz processor.
 Console: colour VGA+ 80x25
 Calibrating delay loop... 799.53 BogoMIPS
 Memory: 386700k/393216k available (1137k kernel code, 6132k reserved,

465k data, 76k init, 0k highmem)

@@ -55,7 +56,6 @@
 VP_IDE: IDE controller at PCI slot 00:07.1
 VP_IDE: chipset revision 6
 VP_IDE: not 100% native mode: will probe irqs later
-ide: Assuming 33MHz system bus speed for PIO modes; override with

idebus=xx
 VP_IDE: VIA vt82c596b (rev 12) IDE UDMA66 controller on pci00:07.1
     ide0: BM-DMA at 0xd000-0xd007, BIOS settings: hda:DMA, hdb:DMA
     ide1: BM-DMA at 0xd008-0xd00f, BIOS settings: hdc:DMA, hdd:DMA

@@ -113,7 +113,3 @@
 EXT3 FS 2.4-0.9.19, 19 August 2002 on ide2(33,1), internal journal
 EXT3-fs: mounted filesystem with ordered data mode.
 Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
-blk: queue c02cc320, I/O limit 4095Mb (mask 0xffffffff)
-blk: queue c02cc774, I/O limit 4095Mb (mask 0xffffffff)
-blk: queue c02ccbc8, I/O limit 4095Mb (mask 0xffffffff)
-hde: DMA disabled

Also, here's some hdparm info:

# hdparm -i /dev/hde

/dev/hde:

 Model=Maxtor 6Y160P0, FwRev=YAR41VW0, SerialNo=xxxxxxxx
 Config={ Fixed }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57
 BuffType=DualPortCache, BuffSize=7936kB, MaxMultSect=16, MultSect=16
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=268435455
 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4
 DMA modes:  mdma0 mdma1 mdma2
 UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 udma6
 AdvancedPM=yes: disabled (255) WriteCache=enabled
 Drive conforms to: (null):  1 2 3 4 5 6 7