Re: 6 in 1 memory card readers

[Kevlar <kevlarcs hotpop com>]

On Fri, 28 Nov 2003 11:44:11 -0800
Rick Stevens <rstevens vitalstream com> wrote:

> Dennis Calhoun wrote:
> > On Fri, 28 Nov 2003 09:50:18 +1000, you wrote:
> > 
> > 
> >>I am trying to get a 6 in 1 memory card reader working on my Redhat
> >9>machine, running a custom 2.4.20-8 kernel.
> >>
> >>When I plug it in, I get a message on the console:
> >>
> >>
> >>>hub.c: connect-debounce failed, port 1 disabled
> >>
> >>I use other usb flash memory devices (usb memory sticks) etc and
> >have no>problem with them. Any idea what could be wrong here?
> > 
> > 
> > Hmmm.... interesting. Do ya think that the "reader" might need a
> > driver? A USB drive is one thing, but a reader like you speak of....
> > seems likely to me that it would be something more and might well
> > need the right stuff to run it.
> 
> No, they generally don't require a driver.  Once you insert the media,
> the media is treated like a SCSI drive.
> 
> If plugging in the reader causes that message, there are several
> possibilities:
> 
> 1) The reader is sucking too much juice from your system.  Try using a
> powered hub instead of plugging it directly into the USB ports (and
> some of the cheap readers will do that).
> 
> 2) The reader has a bad cable or connector (or the connector on your
> system is flakey).  Try another port on your computer.
> 
> 3) The reader is just flat broken.
> 
> You can try shutting down your system, plugging in the reader (do NOT
> have any media in it...just the reader) and rebooting.  If the system
> comes up happily and "dmesg" doesn't report any problems with the USB
> system, try sticking in some media and accessing it.  A quick test is:
> 
> 	fdisk -l /dev/sda
> 
> This should display the partition table of the media in the reader.
> ----------------------------------------------------------------------
> - Rick Stevens, Senior Systems Engineer     rstevens vitalstream com -
> - VitalStream, Inc.                       http://www.vitalstream.com -
> -                                                                    -
> -             To iterate is human, to recurse, divine.               -
> ----------------------------------------------------------------------
> 

I was also sure that usb mass storage support was all that was needed so
thats good.

The device not working can be ruled out, as it works on a Windows box
when I try it.

The connector/cable being bad can also be ruled out, as I used the same
cable to connect it to the Windows machine.

It must require a powered hub then. It does however work fine from a
standard usb port on the Windows machine (no powered hub). 

The card reader has seperate sections for CF cards and SD/Memory stick
style cards. On the windows machine, both of these show up as drives,
regardless of if they have or dont have media.
I use it most for SD/MMC cards and dont currently use CF, is it possible
that the lack of media in the CF section is causing linux to say it
can't load it?


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