Re: [linux-usb-devel] Feiya 5-in-1 Card Reader

Matthew Dharm
2002-09-04T23:10:42Z

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Nope, not confused.

I'm trying to find out why Windows doesn't choke on the strange
READ_CAPACITY value. My guess is that there is code somewhere to
universally fixup READ_CAPACITY, and I'd like to know what the magic
formula is.

The MODE_SENSE bit is fine by me. But it's a SCSI change, so I'm not the
person to ask. The fix to sddr09.c for that seems reasonable, but you put
it all together and I haven't had time to split it up. Of course, I fully
expect the changes to MODE_SENSE in the SCSI layer to break other USB
devices, but there is only one way to find out....

Matt

On Thu, Sep 05, 2002 at 12:56:00AM +0200, Andries.Brouwer@cwi.nl wrote:
> >> Matt, is it ok with you for me to add this patch to the tree?
>
> > I'd like to hold off a few more days while I try to find out what the
> > 'secret sauce' that the other OSes use for a device like this.
>
> Hmm. You do not confuse two situations, do you?
> In the past few days I made two devices work.
>
> One was a Feiya 5-in-1 CF / SM / SD card reader
> (Vendor Id: 090c, Product Id: 1132, Revision 1.00).
> It returned a capacity that is one too large, and becomes
> very unhappy if one tries to read a sector past the end.
> So, a flag was needed to tell that the result of READ CAPACITY
> needs fixing.
>
> The other was a Travelmate CF / SM / SD card reader
> (Vendor Id: 3538, Product Id: 0001, Revision 2.05).
> It became unhappy when MODE_SENSE asked for too much data.
> A patch on sd.c solved this.
>
> Andries

--
Matthew Dharm Home: mdharm-usb@one-eyed-alien.net
Maintainer, Linux USB Mass Storage Driver

It's not that hard. No matter what the problem is, tell the customer
to reinstall Windows.
-- Nurse
User Friendly, 3/22/1998

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