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HOWTO: FC2 USB Multicard Reader (updated)



This is to help anyone trying to get their USB multicard reader working
in Fedora Core 2.

First, you must recompile the scsi module with "Probe all LUNs".
su root; cd /usr/src/linux-<version>;
I use "make menuconfig" -> Device Drivers -> SCSI device ->
check "Probe all LUNs on each SCSI device".  Exit and save.

FC2 adds "custom" to the version in the kernel source.  So you can do
one of two things:

1) Simple but long: Recompile kernel and modules, install.  Update grub.
   Reboot.

2) More complex but faster:  Edit Makefile and remove "custom" from
   XTRAVERSION. make modules.  Kill (ctrl-c) it after you see scsi_mod.ko
   built. copy the new drives/scsi/scsi_mod.ko over the old
   lib/modules/<version>/kernel/drivers/scsi/scsi_mod.ko.
   reload the new scsi_mod module: rmmod scsi_mod; modprobe scsi_mod;

Now you're ready to read cards!

I had to reload the usb_storage module every time i added or removed a card
- rmmod usb_storage; modprobe usb_storage;  The card reader itself is not
removable.

Insert card. reload usb_storage module.  Then use dmesg to see what scsi
device it is.  I get this:
usbcore: deregistering driver usb-storage
Initializing USB Mass Storage driver...
scsi1 : SCSI emulation for USB Mass Storage devices
  Vendor: Generic   Model: USB SD Reader     Rev: 1.00
  Type:   Direct-Access                      ANSI SCSI revision: 02
Attached scsi removable disk sda at scsi1, channel 0, id 0, lun 0
  Vendor: Generic   Model: USB CF Reader     Rev: 1.01
  Type:   Direct-Access                      ANSI SCSI revision: 02
SCSI device sdb: 31488 512-byte hdwr sectors (16 MB)
sdb: assuming Write Enabled
sdb: assuming drive cache: write through
 sdb: sdb1
Attached scsi removable disk sdb at scsi1, channel 0, id 0, lun 1
  Vendor: Generic   Model: USB SM Reader     Rev: 1.02
  Type:   Direct-Access                      ANSI SCSI revision: 02
Attached scsi removable disk sdc at scsi1, channel 0, id 0, lun 2
  Vendor: Generic   Model: USB MS Reader     Rev: 1.03
  Type:   Direct-Access                      ANSI SCSI revision: 02
Attached scsi removable disk sdd at scsi1, channel 0, id 0, lun 3
USB Mass Storage device found at 2

You can see that a 16MB CF card was found and set at the scsi device
sdb with one partition sdb1.  So, mount /dev/sdb1 /mnt/cf;
(assuming /mnt/cf exists).

YMMV.

Let me know if there's an easier way to tell the usb-storage module
that a card has been added or removed.

keywords: linux fedora core 2 fc2 usb multi card multicard reader

-- 
Robert Dale


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