kernel > 2.4.18 and problems with UDMA
From: Edek Kapustnik (edek_at_mam.dosc.spamu.com)
Date: 11/01/03
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Date: Sat, 1 Nov 2003 21:15:26 +0000 (UTC)
Hi,
I'm fighting this problem for many weeks yet.
After long time running with kernel 2.4.5 I decided to upgrade it
to 2.4.21 version. Everything went ok with compilation but after
reboot something strange happened...
While booting, when system informed me by message "Partition check",
it seemed to freeze, but after some time (counted in seconds :) )
I got messages like these:
Partition check:
hde:<4>hde: dma_timer_expiry: dma status == 0x21
hde: 0 bytes in FIFO
hde: dma timeout retry: status=0x80 { Busy }
hde: DMA disabled
ide2: reset: success
It was about 1-2 minute long delay after the first message.
After it, booting process continued with the same messages in every
moment when system tried to communicate with my hdd.
After all, system was started.
I have checked device reads:
hdparm -tT /dev/hde
and there is the result:
/dev/hde:
Timing buffer-cache reads: 128 MB in 1.67 seconds = 76.65 MB/sec
Timing buffered disk reads: 64 MB in 25.64 seconds = 2.50 MB/sec
2.50 MB/sec is not too fast, so I have tried to enable DMA (which
was disabled when system encountered problems with hdd):
# hdparm -d /dev/hde
and...
hde: dma_timer_expiry: dma status == 0x21
hde: 0 bytes in FIFO
hde: timeout waiting for DMA
hde: error waiting for DMA
hde: dma timeout retry: status=0x80 { Busy }
hde: DMA disabled
ide2: reset: success
My hdd is Seagate ST38410A (UDMA 66)
I have a Highpoint HPT 370 controller on motherboard (ABIT BE6-II).
I have tried to compile various kernels 2.4.18, 2.4.19, 2.4.20, 2.4.21
(recently I've tried 2.4.22 and 2.6.0-test[number]).
With kernel version 2.4.18 everything is ok, DMA is enabled. The same
with versions < 2.4.18. But if I boot 2.4.19 or higher, I have
problems as described above. Something was changed in kernel source
code between versions 2.4.18 and 2.4.19, what caused my problems.
I'm not familiar with drivers and C programming, so I can't say
what is it, and I don't know what kind of workaround is possible.
There is an output of 'hdparm -i /dev/hde' under working 2.4.18
kernel:
# hdparm -i /dev/hde
/dev/hde:
Model=ST38410A, FwRev=3.32, SerialNo=5EG0WRFP
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
BuffType=unknown, BuffSize=512kB, MaxMultSect=32, MultSect=off
CurCHS=16383/16/63, CurSects=-66060037, LBA=yes, LBAsects=16841664
IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 *udma4
AdvancedPM=yes: unknown setting
Drive Supports : Reserved : ATA-1 ATA-2 ATA-3 ATA-4 ATA-5
Perhaps here is somebody who will help me with that...
Edek
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