pendrive does not get detected if inserted after getting login prompt

Gangadhar Gangu

Hi All,

1. I've built usb mass storage as a module - usb-storage.ko

2. If pendrive is inserted before kernel boots, it gets detected and can be removed and inserted any number of times without any problem.

/dev/sda1 exists.

3. Pendrive does not get detected if inserted after getting login prompt. No /dev/sda, /dev/sda1

4. Where is the problem - SW/HW ?

5. In /etc/init.d/mdev, at the end I've "modprobe usb-storage"

6. In /etc/mdev.conf there is a rule,

usbdev.* 0:0 0660 */etc/mdev/usb.sh,

so I created /etc/mdev/usb.sh which contains single line - modprobe usb-storage.

But this script never gets created.

7. I commented "mdev -s" in /etc/init.d/mdev, I got the same response.

8. I want this behaviour,

a. pendrive should get detected when inserted at any point of time and module loaded.

b. module should be unloaded when pendrive is removed.

Regards,

Gangadhar

over 11 years ago

0 Titusrathinaraj Stalin over 11 years ago

TI__Guru** 116100 points

Hi Gangadhar,

How about "udev" support on your filesystem ?

In generic fs, udev support is the default one & exits always and your problem seems to be in udev/mdev rule part.

I don't think so, it is a linux driver issue or hardware but lack of filesystem dev rule support.

0 Gangadhar Gangu over 11 years ago in reply to Titusrathinaraj Stalin

Expert 1865 points

Hi Titu,

I was using tisdk7.0 filesystem with udev and faced the same problem.

Regards,

Gangadhar

0 Shankari G over 11 years ago

TI__Mastermind 43955 points

Hi Gangadhar,

Did you try it as a inbuilt driver while building kernel? instead of building it as a module and then probing..?

After "modprobe usb-storage", did you check using "lsmod" to verify that the module is loaded into the kernel?

Instead of having "modprobe usb-storage" in /etc/init.d/mdev, did you try entering the "modprobe usb-storage" command manually after gettting the login prompt?

Regards,

Shankari

0 Gangadhar Gangu over 11 years ago in reply to Shankari G

Expert 1865 points

Hi Shankari,

With tisdk7.0 build, the driver was built-in and faced the same problem.

When built has a module, i checked using lsmod and found usb-storage to be loaded.

I have also tried loading module from cmd prompt.

Regards,

Gangadhar

0 Titusrathinaraj Stalin over 11 years ago in reply to Gangadhar Gangu

TI__Guru** 116100 points

Hi Gangadhar,

With tisdk7.0 build, the driver was built-in and faced the same problem.

Is that behavior from AM335x TI EVM board or from your custom board ?

Do you have any changes on your custom board related to USB hw with reference from AM335x TI EVM board ?

0 Gangadhar Gangu over 11 years ago in reply to Titusrathinaraj Stalin

Expert 1865 points

Hi All,

Thanks for your support. My board USB adapter is little bit different from EVM. For pendrive to be detected host-device converter needs to be connected so that ID pin will be pulled down. Unfortunately OTG does not work for my board. In production board, user has access to usb through hub and this problem will not arise. We can close this.

Regards,

Gangadhar

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pendrive does not get detected if inserted after getting login prompt