UM0851 datasheet(67/245 Pages) STMICROELECTRONICS

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UM0851

Communication device drivers

Doc ID 16604 Rev 2

67/245

Figure 14.

USB Host performance at buffer length=4096

4.3.5

Kernel configuration options

To ensure proper USB support for your devices, you need to enable some of the options in

the kernel.

The following table shows the configuration options.

320

32000

0.959063

273.3334515

0.933094

280.9406126

400

40000

1.160719

282.3077765

1.160719

282.3077765

Table 20.

USB Host device performance results (continued)

BlkSize

(KB)

Data Size

(KB)

BulkOUT time

(s)

BulkOUT

throughput

(Mbps)

BulkIN time

(s)

BulkIN

throughput

(Mbps)

Table 21.

USB host configurations

Configuration option

Comment

CONFIG_USB_SUPPORT

This option adds core support for USB bus.

CONFIG_ USB

Enable this option if your system has the host side bus and you

want to use USB devices and also see your USB devices in

/proc/bus/usb. This is recommended.

CONFIG_ USB_DEVICES

If you enable this option, you will get a file

/proc/bus/usb/devices which lists the devices currently

connected to your USB bus or buses, and a file named

"/proc/bus/usb/xxx/yyy" for every connected device, where xxx

is the bus number and yyy the device number.

CONFIG_ USB_EHCI_HCD

Since the USB Host controller supports USB2.0, enable this

option to configure the Host controller driver. EHCI is standard

for USB 2.0 high-speed host control hardware.

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