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This article mainly introduces the example analysis of iTOP-4418 development board Ubuntu12.04-arm system upgrade, the article is very detailed, has a certain reference value, interested friends must read it!

The EC20 module is packaged into a standard PCIe interface and communicates with the development board mainly through usb. The documents provided this time are

Pppd source code, compiled chat and pppd tools, wcdma,wcdma_back,wcdma-chat-

Connect, wcdma-chat-disconnect, and the pppd_conf.sh script to be used at the end of the document, as shown below

As shown.

Before compiling, modify the compiler to arm-2009q3 compiler. See manual 5.2.2 on how to set the compiler.

Installation of cross-compilation tools. In addition, in order to avoid problems that may arise from using environment variables to set up the compiler, in the document

Most compilers use the absolute path of the compiler, and users should first find the absolute path of their own compiler. The following picture is Ben.

The compiler used for secondary compilation and the compiler compression package.

From the figure above, we can see that the absolute path of the compiler is "/ usr/local/arm/arm-2009q3/bin/ arm-none-".

Linux-gnueabi-gcc ".

1. Driver support

First of all, we need to make some changes to the Linux kernel driver to enable the operating system to support EC20, and first add VID and

PID, that is, the usb manufacturer ID and device ID. Kernel / drivers/usb/serial/option.c text in kernel source code

Add the following two items to the document.

# define EC20_VID 0x1E0E

# define EC20_PID 0x9001

This is shown in the following figure.

Then search for option_ids and add the following to the option_ids list.

{USB_DEVICE (EC20_VID, EC20_PID)}

This is shown in the following figure.

Go back to the kernel directory and configure make menuconfig for the following two items.

The above is all the contents of the article "sample Analysis of Ubuntu12.04-arm system upgrade on iTOP-4418 Development Board". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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