Re: USB 1.0/1.1 devices on modern machines with only EHCI/XHCI.

[Aleš Nesrsta]

Hi,
what do you mean exactly by "GRUB does not detect this device"?
1) Do you mean it is not listed by "usb" command?
2) Or do you mean it is not listed by "ls" command as disk?

In the case 2) it is most probably caused by this: Such device is not 
mass storage class device. I.e., it probably needs some additional 
special driver.
You can check this by lsusb -v
Mass storage device should have something like this (important are 
values in last three rows):
...
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         8 Mass Storage
      bInterfaceSubClass      6 SCSI
      bInterfaceProtocol     80 Bulk-Only
...

I have Dell Latitude E6500 - there is also smart card reader (connected 
directly to UHCI controller) and its interface descriptor unfortunately 
looks like this:
...
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           3
      bInterfaceClass       254 Application Specific Interface
      bInterfaceSubClass      0
      bInterfaceProtocol      0
...

Additionally - this smart card reader device is (AFAIK) also usually not 
recognized by BIOS (it is not possible to boot from this device - at 
least on my notebook).


BR,
Ales

Dne 29.8.2013 09:10, Melki Christian (consultant) napsal(a):
> Hi,
>
> Is there a known problem with these devices in GRUB?
>
> I have a core i7 based Dell Latitude 6430 with an integrated broadcom
> smart card reader. The devices looks like it is a USB 1.0/1.1 device,
> probably sitting behind some hub to the EHCI-controller.
>
> As far as I can tell, this machine does not have a companion UHCI
> controller at all.
>
> GRUB does not detect this device. I had a older machine with the same
> broadcom smart card reader but sitting on a companion controller UHCI.
> That worked just fine.
>
> Regards,
>
> Christian
>
>
>
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