Preamble

A quick glance at the GuruPlug schematics will show it incorporates a Genesys Logic GL850G 4 Port Hub Controller and Genesys Logic GL836 USB2 Flash Card Reader Controller.

The Flash Card reader connects to two micro SD connectors:

• J3 an Internal connector (Storage device 0), not populated on my board and
• J4 which is the external micro SD card slot.

usb start

Starts (scan) USB controller:

Marvell>> usb start
usb start
(Re)start USB...
USB:   Register 10011 NbrPorts 1
USB EHCI 1.00
scanning bus for devices... 3 USB Device(s) found
       scanning bus for storage devices... Device NOT ready
   Request Sense returned 02 3A 00
2 Storage Device(s) found

usb restart

Reset (rescans) USB Controller:

Marvell>> usb reset
(Re)start USB...
USB:   Register 10011 NbrPorts 1
USB EHCI 1.00
scanning bus for devices... 3 USB Device(s) found
       scanning bus for storage devices... Device NOT ready
   Request Sense returned 02 3A 00
2 Storage Device(s) found

usb tree

Shows USB Device Tree:

Marvell>> usb tree

Device Tree:
  1  Hub (480 Mb/s, 0mA)
  |  u-boot EHCI Host Controller
  |
  +-2  Hub (480 Mb/s, 100mA)
    |   USB2.0 Hub
    |
    +-3  Mass Storage (480 Mb/s, 500mA)
          USB Storage 000000009909

usb info

Shows available USB Devices:

Marvell>> usb info
1: Hub,  USB Revision 2.0
 - u-boot EHCI Host Controller
 - Class: Hub
 - PacketSize: 64  Configurations: 1
 - Vendor: 0x0000  Product 0x0000 Version 1.0
   Configuration: 1
   - Interfaces: 1 Self Powered 0mA
     Interface: 0
     - Alternate Setting 0, Endpoints: 1
     - Class Hub
     - Endpoint 1 In Interrupt MaxPacket 8 Interval 255ms

2: Hub,  USB Revision 2.0
 -  USB2.0 Hub
 - Class: Hub
 - PacketSize: 64  Configurations: 1
 - Vendor: 0x05e3  Product 0x0608 Version 119.96
   Configuration: 1
   - Interfaces: 1 Self Powered Remote Wakeup 100mA
     Interface: 0
     - Alternate Setting 0, Endpoints: 1
     - Class Hub
     - Endpoint 1 In Interrupt MaxPacket 1 Interval 12ms

3: Mass Storage,  USB Revision 2.0
 -  USB Storage 000000009909
 - Class: (from Interface) Mass Storage
 - PacketSize: 64  Configurations: 1
 - Vendor: 0x05e3  Product 0x0726 Version 153.9
   Configuration: 1
   - Interfaces: 1 Bus Powered 500mA
     Interface: 0
     - Alternate Setting 0, Endpoints: 2
     - Class Mass Storage, Transp. SCSI, Bulk only
     - Endpoint 1 In Bulk MaxPacket 512
     - Endpoint 2 Out Bulk MaxPacket 512

usb storage

Shows details of USB Storage Devices:

Marvell>> usb storage
  Device 0: Vendor: Generic  Rev: 9909 Prod: STORAGE DEVICE
            Type: Removable Hard Disk
            Capacity: not available
  Device 1: Vendor: Generic  Rev: 9909 Prod: STORAGE DEVICE
            Type: Removable Hard Disk
            Capacity: 1910.0 MB = 1.8 GB (3911680 x 512)

usb dev [dev]

Show or set current USB Storage Device:

Marvell>> usb dev 1

USB device 1:
    Device 1: Vendor: Generic  Rev: 9909 Prod: STORAGE DEVICE
            Type: Removable Hard Disk
            Capacity: 1910.0 MB = 1.8 GB (3911680 x 512)
... is now current device

usb part [dev]

Prints partition table of selected or all USB device(s):

Marvell>> usb part 1

Partition Map for USB device 1  --   Partition Type: DOS

Partition     Start Sector     Num Sectors     Type
    1                   63         1044162       c
    2              1044225         2867455      83