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SubjectRe: Promise Ultra66 DMA problems.
On Fri, Jan 05, 2001 at 05:08:38PM -0500, Adrian Chung wrote:
> hde: Maxtor 91024U3, ATA DISK drive
> hdf: Maxtor 94098U8, ATA DISK drive
> hdg: QUANTUM FIREBALLP LM15, ATA DISK drive
> hdh: QUANTUM FIREBALLP LM30, ATA DISK drive

I initially added only the two quantum drives to the pdc_quirk_list,
and that had no effect, the machine still hung on boot up at the same
place. After this, I added the other two Maxtor's as well, and with
all four drives in the pdc_quirk_list, the system booted up fine.

Should I narrow this down further? Will it be detrimental in any way
to have all four drives listed in the quirks table if they needn't be?

cat /proc/ide/pdc:
PDC20262 Chipset.
---------------------------- General Status ---------------------------------
Burst Mode : enabled
Host Mode : Normal
Bus Clocking : 33 PCI Internal
IO pad select : 4 mA
Status Polling Period : 0
Interrupt Check Status Polling Delay : 0
------------ Primary Channel ---------------- Secondary Channel -------------
enabled enabled
66 Clocking enabled enabled
Mode PCI Mode PCI
FIFO Empty FIFO Empty
------------ drive0 --------- drive1 -------- drive0 ---------- drive1 ------
DMA enabled: yes yes yes yes
DMA Mode: UDMA 4 UDMA 4 UDMA 4 UDMA 4
PIO Mode: PIO 4 PIO 4 PIO 4 PIO 4

and hdparm yields about 25Mbit/s.

I'm trying to get the runtime system to hang like it did before as
well... I'm running "dd if=/dev/hdX of=/dev/null &" on all four
drives simultaneously, and about 3 times per drive to hit the
controller and disk I/O system really hard. So far, it's all been
fine. Hopefully that means that the problems gone away. :)

Thanks for the help!

--
Adrian
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