Building The Driver; Install Cross Compiler; Modify The Source Code File Of Linux Kernel - Quectel UC20 User Manual

Embedded linux usb driver

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UMTS/HSPA Module

UC20 Embedded Linux USB Driver User Guide

The USB Host Controller driver, the bottom of the hierarchical structure, is a software module which

interacts directly with hardware.

USB core, the core of the whole USB host driver, is responsible for the management of USB bus, USB

bus devices, and USB bus bandwidth, providing the interfaces for USB device driver, through which the

applications can access the USB system files.

USB device drivers interact with the applications, and mainly provide the interfaces for accessing the

specific USB devices.

3.2.

Building the Driver

During the development based on embedded Linux OS, you must retrieve the Linux kernel source code

files and install an appropriate cross compiler first, then modify the kernel configuration and

corresponding source code files, and compile the kernel to generate image file, then burn the file into the

target machine (The OS of the target machine is Android 4.0.3, and the corresponding Linux kernel

version is 3.0.8).The detailed steps are shown as below:

Cross-compilation is an important technology for embedded development. Its feature is that the source

code files are not compiled in native machine but the other one. In general we call the former target

machine and the latter host machine.

The reason of adopting cross-compilation is that most embedded target system cannot provide enough

resources for compiling source code files, so we have to do that in a high-performance host machine in

which we will create an environment of cross-compilation for the target machine.

In general, the vendor of the embedded machine would provide the cross compiler and the installment

method about it. Here, we use the cross compiler "arm-linux-gcc-4.5.1", install it and add the compiler's

path in the system environment variables, then re-logout system, then you can use the cross compiler to

compile the source code files.

Modify the source code file "option.c" in Linux kernel by adding VID and PID of UC20, so that the OS can

recognize it.

UC20_Embedded_Linux_USB_Driver_User_Guide

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