# (If you have a serial to USB converter like the Prolific 2303, you'll need this)
USB RTL8150 based ethernet device support (EXPERIMENTAL) # (If you have a USB Network Card like the RTL8150, you'll need this) # (Moving a little further down, we come to CDC and mass storage.) If you'd like to compile this as a module, it will be called usbcore.) # (This is the root hub and is required for USB support. # (Then move back a level and go into USB support) # (Although SCSI will be enabled automatically when selecting USB Mass Storage,
#Using lsusb drivers#
KERNEL make menuconfig options Device Drivers -> The lspci command (comes with the sys-apps/pciutils package) is perfect for this purpose.Įxample for a USB 1.1 compliant system (note the UHCI in the output):
It is very simple to find out whether the machine in question has USB support. Some of these classes are the USB HID (Human Interface Devices) class which covers input devices like keyboards and mice, the USB Mass Storage devices class which covers devices like pen drives, digital cameras, audio players etc and the USB CDC (Communication Devices Class) which essentially covers USB modems and similar devices. This means that if a device belongs to a certain class, then other devices belonging to the same class can make use of the same device driver.
#Using lsusb driver#
| -+-> -+-> ( EHCD ) |Ī USB device can either use a custom driver or use one already present in the system and this is based on the concept of a device class.
#Using lsusb software#
The following diagram should make things easier to comprehend.ĬODE # Software consists of other components as well like the device driver, but for the sake of simplicity, they are not shown It is through this HCD that the device interacts with the system software. The hardware vendor provides an interface for the programmer that allows the system to interact with the hardware and this is called the HCD or Host Controller Device. The OHCI/UHCI are the two industry standard USB 1.1 interfaces whereas EHCI is for USB 2.0 and xHCI is compatible with all of the previously mentioned interfaces including USB 3.0. They are the OHCI (Open HCI) by Compaq, UHCI (Universal HCI) and EHCI (Enhanced HCI) which are both from Intel, and xHCI (eXtensible Host Controller Interface). There are a couple of HCIs (Host Controller Interfaces) in use today. The host controller is nothing but the hardware interface between the USB device and the operating system. For readers in a hurry or want to skip this section, please go to the kernel configuration section.Ī USB system has a host controller, hubs, a root hub amongst others and can support up to 127 USB devices including the hubs. Another advantage with USB is that the devices are all hot-pluggable, which means the system does not need a restart in order for the devices that have been plugged in to work.īefore the exact configuration options in the kernel, it would be apt to look at USB in a little more detail.
USB 2.0 supports a maximum data transmission speed of 480 Mbit/s or 60 MB/s, 3.0 can transfer at a rate of 5.0 Gbit/s or 625 MB/s, and 3.1 tops out at a whopping 10.0 Gbit/s or 1.25 GB/s. The latest USB devices are typically USB 3.0 compatible, although some motherboards still include USB 2.0. Likewise USB 3.0 and 3.1 can work with versions 2.0 and 1.1. Since USB has always been backward compatible with previous versions, USB 2.0 is backwards compatible with USB 1.1. There are currently three versions of USB in use, USB 2.0, USB 3.0, and USB 3.1. Some of the most commonly used USB devices are keyboards, mice, pen drives, digital cameras, external CD and DVD writers, printers, MP3 players, smart phones, and biometric devices. USB stands for Universal Serial Bus which is an external interface standard that enables communication between computers and various peripherals.
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