Subject: Re: accessing IDE hard drive via pcmcia card
To: Charles M. Hannum <email@example.com>
From: Steven M. Bellovin <firstname.lastname@example.org>
Date: 05/17/2004 20:16:47
In message <email@example.com>, "Charles M. Hannum" wri
>On Monday 17 May 2004 21:28, Manuel Bouyer wrote:
>> On Mon, May 17, 2004 at 05:10:36PM -0400, Steven M. Bellovin wrote:
>> > In message <20040517210116.GA6013@antioche.eu.org>, Manuel Bouyer writes:
>> > >On Mon, May 17, 2004 at 11:24:55AM -0400, Steve Bellovin wrote:
>> > >> [...]
>> > >> I can remove and reinsert the card:
>> > >>
>> > >> atabus2 detached
>> > >> wdc2 detached
>> > >> wdc2 at pcmcia0 function 0
>> > >> atabus2 at wdc2 channel 0
>> > >
>> > >Can you try a recent current kernel ?
>> > >I debugged a similar problem with a PCMCIA cdrom last week-end ...
>> > >
>> > >If this doesn't help, you can try breaking into ddb before inserting
>> > >the adapter and typing
>> > >write wdcdebug_mask 0x10
>> > >c
>> > >
>> > >Then the kernel should print message, which hopefully will help finding
>> > >why the kernel thinks there's no drive here.
>> > Per my followup posting, the kernel is saying
>> > wdc2:0: before reset, st0=0x80, st1=0x80
>> > atabusattach: ch_drive_flags 0x0 0x0
>> > This is with a kernel from yesterday's 2.0-branch source. If it will
>> > help, I can build a -current kernel for that machine, but that will
>> > take until tomorrow, given how slow my -current machine is.
>> It will help. I suspect the register writability test fails but I don't
>> know why. I added printfs for this to current last week-end.
>Well, if BSY is asserted (as it is in the "before reset") message when we do
>the test, the results will definitely be useless with many devices, since in
>this case all registers will read the same as the status register.
>I think BSY is probably asserted here because the device is still doing its
>power-on reset. For removable devices, at least, we may need to do more work
Hmm -- a delay loop, polling (a few times) for BSY going away? That's
easy enough to try.
--Steve Bellovin, http://www.research.att.com/~smb