Hi,

  Noted. But whenever I am running "insmod ohci" or other host controller
(ehci or uhci) in grub command line and then "usb", I get always "(hd0,
mdos1) not found error" even for serial modem device.

  Please help.
with regards,
Arindam
On Wed, Aug 26, 2020 at 1:27 AM Vladimir 'phcoder' Serbinenko <
phco...@gmail.com> wrote:

> You need to insmod the usb controller driver
>
> вт, 25 авг. 2020 г., 18:06 Arindam Khan <arindamkhan2...@gmail.com>:
>
>> Hi,
>>
>>    I am working on a custom STM32 board and have configured the board's
>> USB OTG as a serial modem device. In Linux, it is getting detected as a
>> "/dev/ttyACM" and all read and write is working fine. However, when I load
>> the "usbtest" module of grub and run it with the "usb" command, it does not
>> show any USB devices. Is it possible to iterate over all usb devices
>> attached in a machine in GRUB?
>>
>> kindly help.
>>
>> --
>> with regards,
>> Arindam
>>
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>> Grub-devel@gnu.org
>> https://lists.gnu.org/mailman/listinfo/grub-devel
>>
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