mdev implementation in small Embedded systems

[b.mah...@gmail.com]

Hi,
I am using multiple USBs in small Linux embedded system.
whenever I plug-In USB mdev creating the node in any of sd[a-z][1-9].
I want to map the each USB to my desired name.
As of now I am using below rule in mdev.conf
sd[a-z][1-9]* root:disk 0660 @ln -sf $MDEV USB

Now the problem with below scenarios.

1) first I connected one USB,suppose it mapped to sda1
at this stage USB pointing to sda1
USB->sda1
2) when I connect next USB,suppose it mapped to sdb1
at this stage USB pointing to sdb1
USB->sdb1

I am missing the 1) device soft link after switch on 2).

Is there any way to map linux default drives to my desired names in
user space????

Thanks in Advance

[Lokesh]

Hi mahesh,

As per your explanation.
You connect usb 1 and it detects as sda1 and later you connect usb2
and detects as sdb1 and when u look sda1 will
not be visible to you right?

Then it is the case in which the order you use to detect the drivers
for the devices.
You can do an experiment
1. Detect a scsi device first and it will select as sda and next the
USB and sd* so on
This should go in serial, i think mdev is not smart enough to
identify and correct the drive letter.
Rather you can see /proc/partitions as drivers gets loaded and
name them as per this.

Did i conveyed? or you need something else..?