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Content-Type: TEXT/PLAIN; charset=US-ASCII

I am now very puzzled about the HPT366.  I still can't get both channels
to work concurrently.

Last night I modified my code to use a wdc command queue which is shared
between the two halves of the HPT366 (each of which appears as a single-channel
PCI-IDE device).  But this made no difference.  As before the disk on each
channel probed and attached correctly, and I could do I/O to either disk
on its own without any problems.  But as soon as I tried to read from
both disks at the same time, I got an immediate hangup.

While looking at the wdc driver, I spotted code for hardware-locking
(the (*claim_hw)() and (*free_hw)() function pointers in struct wdc_softc.
This looks like a bit of "haunted code", in that it doesn't seem to be used by
anything.  I wasn't convinced that it does anything more than a shared
channel queue, but decided to give it a try, but this made no difference.
This code is included in the patch.

One thing did work (not that it's any use).  A couple of nights earlier I
had tried "slugging" hpt366_pci_intr() with a DELAY(100000) to try to
serialise I/O on the two channels, but it didn't work.  I forgot to remove
this delay when I added the shared command queue, and for the first time
I was able to read from both channels of the HPT366 (albeit V E R Y
S L O W L Y !!!).

Clearly there is something very wrong.  When the system locks up I can't
break in with kgdb.  Last night I recompiled the kernel to include ddb,
but I can't get in with that either.  The strange thing is that accessing
one disk at a time shows no problems at all (although the experiment with
the shared channel queue suggests that the HPT366 needs a "rest period"
when switching channels).  It's as though the HPT366 grabs the bus, then
goes insane and won't let go again.  

Manuel Bouyer was concerned that the shared IRQ might be the problem.
I'm doubtful about this, because I put a printf in hpt366_pci_intr() to
print the channel number and the return value from wdcintr().  As far as
I could see (reading from one disk, then the other), wdcintr() was claiming
the interrupt on the right channel.

As I can't use a kernel debugger, the only way I'm going to get
anywhere is by turning on all the wdc and pciide debug printing (and
probably putting even more printf()'s in as well).  This means I'll
have to build a kernel with a serial console - and run without syslogd,
because it throws a wobbler with wdc debug printing on, as each message
written to /var/log/syslog results in several more!

First, I'm going to contact Highpoint-Tech to see if I can get programming
info.  I've been meaning to do this for a while, but the Linux patches
looked quite simple...  I'm also going to flash a new BIOS, as my BP6
motherboard (bought last August) has the initial version (LP, with v 1.07
HPT366 BIOS).  I've just downloaded version NJ (with v 1.21 of HPT366 BIOS).

I've attached my patches (to -current last supped 26/02/00) for anyone who
wants to try it (cd to /usr/src/sys before applying).

The most useful things to try would be:

    Two UDMA/66 disks (identical if possible) on the same HPT366 channel

    Two UDMA/66 disks (identical if possible), one on each HPT366 channel,

but any reports of success or failure would be useful.




Roger

------------------------------------------------------------------------------
Roger Brooks (Systems Programmer),          |  Email: R.S.Brooks@liv.ac.uk
Computing Services Dept,                    |  Tel:   +44 151 794 4441
The University of Liverpool,                |  Fax:   +44 151 794 4442
PO Box 147, Liverpool L69 3BX, UK           | 
------------------------------------------------------------------------------

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Content-ID: <Pine.GSO.4.10.10003082211150.4262@uxb.liv.ac.uk>
Content-Description: UDMA/66 patch for HPT366
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