I have a 6-1 reader. All the media is working just fine. I can read and
write to SD, SM and Compat Flash. All three are inserted into the
reader.
It's under Fedora Core 2 and kernel 2.6.6. I have also been successful
with the kernels which are packaged with Fedora Core 2.
Now the device is only USB 1.1, maybe the problem lies somewhere else with
USB 2.0???????
Dwaine..
Alan Stern
<[EMAIL PROTECTED]
harvard.edu> To
Sent by: Gregory Gulik <[EMAIL PROTECTED]>
linux-usb-devel cc
[EMAIL PROTECTED] [EMAIL PROTECTED], USB
urceforge.net development list
<[EMAIL PROTECTED]
et>
05/26/2004 bcc
03:17 PM
Subject
Re: [linux-usb-devel] 6-in-1 USB
problems with 2.6.5 kernel (Fedora
Core 2)
On Wed, 26 May 2004, Gregory Gulik wrote:
> I've been trying to resolve a problem with a 6-in-1 card reader using
> USB 2.0 that used to work with Fedora Core 1 (2.4 kernel) no longer
> works with the 2.6.X kernel in Fedora Core 2.
>
> I eventually found that I needed to add "options scsi_mod max_luns=16"
> to modprobe.conf and that seemed to work. I currently have only CF and
> SD cards so those are the only ones I can test. The CF cards appear on
> the first LUN so they always work but when it comes to the SD card I
> found it two devices down. For example, I have a USB 2.0 hard drive on
> /dev/sda, then the CF card appears on /dev/sdb and the SD card appears
> on /dev/sdd. However when I try to do ANYTHING to /dev/sdd (fdisk -l,
> mount, etc.) the command hangs and cannot be killed. The only way to
> fix it is a reboot.
>
> Here is how the card reader appears in dmesg:
>
> scsi1 : SCSI emulation for USB Mass Storage devices
> Vendor: Model: USB Card Reader Rev: 1.01
> Type: Direct-Access ANSI SCSI revision: 02
> Attached scsi removable disk sdb at scsi1, channel 0, id 0, lun 0
> Vendor: Model: USB Card Reader Rev: 1.01
> Type: Direct-Access ANSI SCSI revision: 02
> Attached scsi removable disk sdc at scsi1, channel 0, id 0, lun 1
> Vendor: Model: USB Card Reader Rev: 1.01
> Type: Direct-Access ANSI SCSI revision: 02
> Attached scsi removable disk sdd at scsi1, channel 0, id 0, lun 2
> Vendor: Model: USB Card Reader Rev: 1.01
> Type: Direct-Access ANSI SCSI revision: 02
>
>
> When I plug in an SD card and try to access it this appears in dmesg:
> SCSI device sdb: 258816 512-byte hdwr sectors (133 MB)
> sdb: assuming Write Enabled
> sdb: assuming drive cache: write through
> SCSI device sdb: 258816 512-byte hdwr sectors (133 MB)
> sdb: assuming Write Enabled
> sdb: assuming drive cache: write through
> sdb: sdb1
> SCSI device sdd: 494080 512-byte hdwr sectors (253 MB)
> sdd: assuming Write Enabled
> sdd: assuming drive cache: write through
> SCSI device sdd: 494080 512-byte hdwr sectors (253 MB)
> sdd: assuming Write Enabled
> sdd: assuming drive cache: write through
> sdd:
>
> Any attempt to access /dev/sdd causes the command to hang until a
> reboot. Please advise.
Andries Brouwer can give you more information about this. Basically, I
think the problem is that the usb-storage driver isn't set up to allow
more than one type of subdriver per device, and SD and CF cards use
different subdrivers. Right now the CF subdriver is loaded because it
appears in the first device entry in drivers/usb/storage/unusual_devs.h.
If you were to put the SD subdriver's entry first and rebuild usb-storage
then you would be able to use SD cards but not CF.
As it is, when you put an SD card in the reader, usb-storage tries to talk
to it using the CF subdriver. No wonder things hang! Nobody has
implemented a general solution for this yet.
Alan Stern
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