Thanks for the advice Amol !
If I well understood you modified the probe function to remount an already seen
peripheral... something like that ? I will have a look at the usb probe
function and the /proc/scsi interface.
I will contact you propbably to let you know about my progress ;-)
Cordialement,
Xavier MONTAGNE
Pragmatec
06.98.06.21.55
----- Original Message -----
From: amol sukerkar
To: uClinux development list
Sent: Tuesday, September 11, 2007 7:18 PM
Subject: Re: [uClinux-dev] USB and /dev/sdx interface
Hi Xavier,
I have fixed this problem and it works. I had to be a little
innovative to handle this. This is how I did it.
Every USB thumb drive is assigned a unique GUID by the USB driver. And the
information is stored and updated in the real time in the file
/proc/scsi/usb-storage-x/x. Here x is the order of the thumb drive. For
instance, for the first thumb drive you insert, it will be 0, for the next it
will be 1 and so on. The GUID is listed in the file 'x'.
All you have to do is match GUID with the device file, i.e.,
sda1 and so on. So, sometime after USB Mass Storage driver enumerates the USB
thumb drive in function "probe"(of course, when remounted and not the first
time. You used the word "reuse"), run through the files
/proc/scsi/usb-storage-x/x. And match the GUID obtained by the probe function
to the GUID listed in the files. If GUID from file '0' matches, then, you go
ahead and assign /dev/sda1 device file name to the USB thumb drive and so on.
I thought this is an efficient method and saves a lot of work
involved in doing insmod/rmmod.
Hope this makes sense!
Merci,
Amol :-)
On 9/11/07, xavier.montagne <[EMAIL PROTECTED]> wrote:
Hi,
Everytime I insert a new USB key to my SL811 controler, the kernel detects
properly the key and affect a new interface :
/dev/sda1
/dev/sdb1
/dev/sdc1
If I reuse the same key Linux succeeds to see it and affect the same
previous interface (/dev/sdb for instance).
But how to use everytime the same interface /dev/sda, even if I remove the
key and insert a different one into the same slot ?
Is it a standard Linux behavior to lock a /dev/sdx interface for a
dedicated peripheral once detected ?
Cordialement,
Xavier MONTAGNE
Pragmatec
06.98.06.21.55
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